degree of polymerization ppt

1. Add 1.5 mL of … Concerning: Molecular Weight Rate (kinetics) Heat effects (thermodynamics) Bulk polymerization The. M is the molecular weight of the polymer, DP is the degree of polymerization and the M 0 is the formula weight of the repeating unit. Polymerization, any process in which small molecules known as monomers combine chemically to produce a very large chainlike or network molecule, called a polymer. Thus, the proportion of termination to propagation increases substantially with increasing free solid having a degree of polymerization n ranging from two to greater than six. CASE 1 ; Mono-disperse Polystyrene Gel Permeation Chromatography (GPC) standard. Heterogeneous polymerization a) Suspension b) Emulsion 1.. Anionic addition polymerization is a form of chain-growth polymerization or addition polymerization that involves the polymerization of monomers initiated with anions. Mobility is reduced and this can affect termination events, so the rate of reaction is increased 3. The process of linking the repeating units is termed as polymerization . Lecture 2.0 Polymerisation - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Polyester (PET)- 100. • To introduce the concept of a “living” polymerization. Degree of polymerization ≡ number of monomer units or structural units incorporated in polymer chain = pn 2 n u n p M M ⋅ = where M u = molecular weight (MW) of individual repeat units Can also have a—b monomers: e.g. 1 / DP = 1 / DP 0 + C M + C S [S] / [M] The amount of chain … Degree of Polymerization. If you continue browsing the site, you agree to the use of cookies on this website. On the other hand, in chain-growth polymerization, the monomer consumed steadily but the degree of polymerization could be increased very quickly after chain initiation. Organic chemist friends of ours are happy to get reaction yields of … In the absence of chain transfer the expression above can be written as . Solution polymerization | PowerPoint PPT presentation | free to view . See our User Agreement and Privacy Policy. Two-Dimensional Polymerization of Lipid Bilayers: Effect of Lipid Lateral Diffusion on the Rate and Degree of Polymerization. Also, the polymerization reactions for Nylon 6 and Spandex do not proceed by elimination of water or other small molecules. In this paper a new method to estimate DP from load and temperature histories is … The difference in Tg and Tm between the first polyester (completely aliphatic) and the two nylon polyamides (5th & 6th entries) shows the effect of intra-chain hydrogen … Several If you continue browsing the site, you agree to the use of cookies on this website. There are 3 mechanisms of termination: 1. 2. n u n. p M M. ⋅ = where M. u= molecular weight (MW) of individual repeat units. degrees of polymerization of x and y meet their free-radical ends. The number average degree of polymerization is given by (1) DP = X n = M n M 0. where M n is the number average molecular weight and M 0 is the molecular weight of the monomer. The degree of polymerization is the number of mono meric units in a macromolecule or polymer molecule . Effect of Substituents on Chain Mechanism Monomer Radical Anionic Cationic Hetero. Macromolecules 1999 , 32 (1) , 73-78. Wool- 60,000-100,000. See our Privacy Policy and User Agreement for details. Autoacceleration. Analysis of Conducting Polymer:Polypyrrole::Part 1, No public clipboards found for this slide. High degree of polymerization 3. The … 8.45. Polymerization is possible only if ∆G < 0 for the transformation of monomer to polymer. OF P’CEUTICS, SND COLLEGE OF PHARMACY. HEAD AND ASSOCIATE PROFESSOR, Thus, the average degree of polymerization depends on the monomer and solvent concentration and on the velocity constants of radical formation, chain termination and chain transfer. CASE 2 . M- concentration of all anions in the system M concentration of the monomer C concentration of the initiator n the number of anions that an initiator molecule produces. In other words, the distribution of how long your polymer chains are in your reaction must be very low. Emulsion polymerization BULK POLYMERIZATION The simplest method of polymerization where the reaction mixture contains only the monomer and a monomer soluble initiator. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. unlike conventional … For most industrial purposes, degrees of polymerization in the thousands or tens of thousands are desir… Its for First year BE/BTech Anna University Students CY6151- Engg.Chemistry-I I Unit Polymers. Small yield per reactor volume 6. Usually at least 100 monomers must be combined to make a product that has certain unique physical properties. Eq. If no chain transfer reactions were possible, then the number … • To emphasize the utility of anionic and living polymerizations in the synthesis of block copolymers. The degree of polymerization will increase steady during the whole polymerization process. This is the primary feature of polymer that describes its physical properties as well. Polynosic- 700-1100. Polymerization. and M0 is the molecular weight of the monomer unit. The type of reaction has many manifestations, but traditionally vinyl monomers are used. techniques Process conditions: Homogeneous polymerization: a) Bulk b) Solution 2. Synthetic fibers are created by extruding fiber forming materials through spinnerets into air and water, forming a thread. For example, if a—a is a diacid and b—b is a diol: from diacid from diol. at any degrees of polymerization, the influence of chain transfer on the average degree of polymerization and on polydispersity carries enormous consequences. Anionic polymerization is a type of chain growth polymerization in which an anionic initiator transfers a charge to a vinyl monomer which then becomes reactive. •High degrees of polymerization ( molecular weight) are obtained only at high degrees of conversion of monomer Two sites (AB or AA + BB) give a linear polymer chain - + Polycarbonate via condensation of bisphenol A and phosgene; an example of an AA + BB polymerization •Non-living, except in a few cases (e.g., Yokozawa) Degree of polymerization. If we divided , the molecular weight of polymer by the molecular weight of monomer , then we can get the degree of polymerization . Viscose Rayon- 150-350. Ethylene molecules are joined together in long chains. The growth reaction takes place by the addition of one unit at a time to the active … The quantitative effect of temperature is complicated and is discussed in the following sections. High rates of polymerization 2. Now customize the name of a clipboard to store your clips. Malaviya National Institute Of Technology Jaipur, Polymer science: preparation and uses of polymers, No public clipboards found for this slide. 3 5. of Chemistry. Common synthetic fibers include: Nylon; Modacrylic; Olefin; Acrylic; … (2.24) into the Mayo–Walling type equation gives the number-average degree of polymerization as given in Eq. The polymerization is reversible and, on strong heating, the polymer reverts to cyclopentadiene. The polymerization of deoxy protein was initiated by the temperature jump from 0 to 30°C, and the extent of polymerization was monitored by measuring the absorbance of turbidity at 700 nm. The polymerization is obtained with a broad molecular weight distribution due to the high viscosity and lack of good heat transfer. HO CH 2 C OH O OR” C O n CH C In this case: • R” = CH 2 • The repeat unit is the structural unit Mp nn=⋅M u C O R’ O R C O O n Polyester (one repeat unit consists of 2 structural units) Citation: … The requirements for a separate solvent recovery step Suspension … Aims: We assessed to what extent fructans of different degrees of polymerization (DP) differ in their prebiotic effectiveness towards in vitro microbial communities from the proximal and distal colon. Polymer, molecular weight, property, polymerization, effect of molecular weight, chemical engineering, average molecular weight, degree of polymerization, injection molding, extrusion, polydipersity POLYMER SCIENCE. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 2.5 Degree of Polymerization The degree of polymerization (DP or Xn) is defined as the number of monomer units in the polymer. In 1984, Higashimura and Sawamoto reported the first living cationic polymerization for alkyl vinyl ethers. If you continue browsing the site, you agree to the use of cookies on this website. Polymers and Polymerizations Polymers are macromolecules built up by the linking together of large numbers of much smaller molecules. Radical polymerization shows a half-order dependence of Rp on Ri, while cationic polymerizations show a first-order dependence of Rp on Ri. It is calculated as the ratio of molecular weight of a polymer and molecular weight of the repeat unit. Compared to step-growth polymerization, living chain-growth polymerization shows low PDI, predictable molecular mass and controllable … A failure can cause hug revenue loss to utilities. A relatively broad, calculable distribution molecular species are present throughout the course of the polymerization. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. … It can cause non availability of transformers for long hours. In practical conditon, using this method is complicated and expensive due to the necessity of disasembling the transformer. Note. The number-average degree of polymerization X n is given as the total number of monomer molecules initially present divided by the total number of molecules present at time t, X n = N o / N = [ M ] o / [ M ] [ M ] = [ M ] o ( 1 – P ) X n = 1 / 1 - P

  • This … Further, you can calculate its degree using the steps mentioned below. High purity of product 4. See our Privacy Policy and User Agreement for details. Semester 1 2007/2008 Fisika Polimer AriadneL. (2.25) in terms of all possible contributions. A bifunctional monomer containing two viologen moieties was designed. You need to … A key characteristic … DP No ' N Thus, the degree of polymerization can be expressed by DP = No N0d-P) i 1-P Consider a reaction that can be pushed to 90% completion. Polymerization of HbS and diGEE-HbS was carried out in 1.8 M potassium phosphate buffer, pH 7.2. • Polymerization mainly occurs in the micelle interiors due to: • high monomer concentration • high surface/volume ratio • presence of interface for organic monomer and water-soluble initiator • During polymerization, monomer is replenished by diffusion from droplets through the solution to micelles. (Because in reality polymers consists of chains of different length, the average value is used.) i: degree of polymerization (# of monomer units) Mi=iM0 M i: molar mass of polymer molecule i M 0: molecular weight of monomer Typically have distribution of masses (all chain lengths aren’t equally long) monodisperse — equal chain lengths purified proteins, dendriners polydisperse — unequal lengths Silk Fibre Structure. Calculate the number-average degree of polymerization of an equimolar mixture of adipic acid and hexamethylene diamine for extents of reaction of 0.500; 0.800; 0.900, 0.950; 0.990; 0.995. ! Now customize the name of a clipboard to store your clips. Failure of a Transformer leads to loss of Revenue besides affecting reliability of power supply to consumers. High molar mass polymer are produce … Juwono Combination To give a single terminated chain of degree of polymerization x + y 7.2. Power transformers are ' the heart of substation'. Synthetic polymers: nylon, poly-ethylene, poly-styrene Biological polymers: DNA, proteins, carbohydrates Methods for making polymers Addition polymerization and condensation polymerization Addition polymerization: monomers react to form a polymer without net loss of atoms. Chain transfer. Polymerization 1. There are two commonly used and numerically different ways of expressing the … Polyacrylonitrile > 2000. 68 V.S.Saravana Mani, Head& … Degree of polymerization ≡ number of monomer units or structural units incorporated in polymer chain = pn. Fibers and DP ( Degrees of Polymerisation) Nylon 6 -120. Introduction To The Physical Chemistry Of Polymer. Addition polymerization: This is the type of polymerization in which the molecules of a similar monomer or different monomer add up together on a large scale to form a polymer. 1 / DP 0 = (k tr /2 + k td) I 1/2 / {(k tr + k td) 1/2 k p [M]} = K T {2f C D [Cat]} 1/2 / [M] Therefore. Initiation, propagation, and termination reactions have different rates and mechanisms. Difficult to remove solvent from final form, causing degradation of bulk properties . By varying the polymerization temperature, there is big effect on the rate and degree of polymerization . 27 Microleakage between Bacteria inside dentinal tooth and restoration tubule 28. Phenol is a toxic substance and can cause serious burns. At an average degree of polymerization of 10, less than 1 weight percent of the monomer remains. This Marginal Gap Creates An Increasingly Deteriorating Conditions For … PRESENTED BY: KANTILAL B. NARKHEDE M.PHARM.1st SEMESTER DEPT. Introduction to Polymers 1 2. Degree of polymerization The Degree of polymerization (n or N) is defined as 10 the number of monomeric units in a macromolecule or polymer or oligomer molecule. When the temperature increases, the rate of polymerization increases, but the degree of polymerization decreases as shown in Fig. M- concentration of all anions in the system M concentration of the monomer C concentration of the initiator n the number of anions that an initiator molecule produces. moles of P*; P: number-average degree of polymerization of the polymer obtained at reaction time t; f([l), g (tm) and u (tn) increase with increasing tl, tm and tn. For reducing the disadvantages of bulk polymerization, the process can be carried out in a solution. How many monomers make up each polymer (the degree of polymerization) must be related linearly to the amount of monomer you started with. The degree of polymerization can be calculated by using the following relationship if a molecular weight of a polymer molecule is known. Number average DP and weight average DP are the two main types used for measuring the DP. Nevertheless, the polymer clearly forms by a step-growth process. Polymerization that occurs through the coupling of monomers using their multiple bonds is called addition polymerization. Looks like you’ve clipped this slide to already. – overall degree of polymerization: ... (PTMO) and polybutylene adipate glycol (PBA) as soft segments were synthesized by one-step bulk polymerization process. This means that 70% of the possible reactions have already occurred, even though we are still dealing with a very low average degree of polymerization. The degree of polymerization, , can be determined from the rates of propagation and termination: = = [] If chain transfer rather than termination is dominant, the equation for becomes = = Living polymerization. Therefore an alternative method has been expected. Often anionic polymerization involves living polymerizations, which allows control of structure and composition. Disproportionation 3. Polymerization, Isobutyl Rubber Synthesis, Polyvinyl Ethers Cationic Polymerization Some differences between cationic and anionic polymerization • Rates are faster for cationic (1 or more orders of magnitude faster than anionic or free radical) • is very reactive, difficult to … Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. It is calculated as the ratio of molecular weight of a polymer and molecular weight of the repeat unit. (2) shows that a high monomer conversion in step … Learn more about polymerization. 8.39) point out a very significant difference between cationic polymerization and radical polymerization. The degree of polymerization of silk fibroin is uncertain, with DP of 300 to 3000 having been measured in different solvents. Degree of polymerization. When we keep adding monomers to obtain a large chain, such a process is also called as the chain growth polymerization. The degree of polymerisation can be defined as the frequency of repeating units present in a polymer. • Polymerization in the aqueous phase is insignificant due to the low monomer concentration. Polymers are formed from repeating units of a monomer, which are linked to each other by covalent bonds. There are two basic types of polymerization, chain-reaction (or … Some Condensation Polymers. For instance, if a polymer P is made up of 5 numbers of monomers (M), then its degree of polymerisation will be 5. PowerPoint Presentation : Suspension polymerization most commonly used as industrial manufacturing method in order to get polymer for forming material such as polystyrene, polymethylmethacrylate , polyvinyl acetate, polyvinyl chloride, because a polymer with a high degree polymerization is obtained with the polymerization and generated polymer isolation is easy. S. Wadhwa, The Tata Power Company Limited, Mumbai email: jwadhwa@tatapower.com Abstract - Power Transformers are the most vital components in a sub-station / Receiving station. a—a + b—b → a—c—b +d. Looks like you’ve clipped this slide to already. One way of measurement of conversion is the degree of polymerization represented as DP or Xn. Chemical Composition of Silk Fiber, Cotton Fiber & Wool Fiber. large molecule or a macromolecule which essentially is a combination of many subunits solid having a degree of polymerization n ranging from two to greater than six. Ex: calculate the degree of polymerization of a sample of polyethylene [ (CH 2-CH 2) n], which has a molecular … Formaldehyde is a suspected carcinogen and should also be handled with gloves. Polymer, molecular weight, property, polymerization, effect of molecular weight, chemical engineering, average molecular weight, degree of polymerization, injection molding, extrusion, polydipersity They are the vital links between generation and transmission. 3- modulus of elasticity of the material. See our User Agreement and Privacy Policy. A new method of light-powered dissipative supramolecular polymerization is established, in which supramolecular polymerization is implemented in the far-from-equilibrium state. Clipping is a handy way to collect important slides you want to go back to later. Many natural materials—such as proteins, cellulose and starch, and complex silicate minerals—are polymers. Nevertheless, polymers with degrees of polymerization determined by the ratio of the concentration of reacted monomer to the overall concentration of active species or of introduced initiator (DPn=A[M]/[I]o) have been 6 prepared with the narrow molecular weight distributions. you dont get to decent degrees of polymerization, lets say 200, unless you have high degrees of conversion, for this example p 0.995, or a conversion of 99.5 ! Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Wear gloves when handling and avoid contact with skin! The number average degree of polymerization is given by (1) DP = X n = M n M 0 Nylon 6,6-200. Solvent may terminate the growing polymer chain, leading to low molecular weight polymers 4. If you continue browsing the site, you agree to the use of cookies on this website. The dispersity of the polymer must be < 1.5. (2.25) 1 X ¯ n = K t K P [M] + K tr, M K P + K tr, S [S] K P [M] It can be seen that in cationic polymerizations, the number-average degree of polymerization is independent of initiator concentration. V.S.Saravana Mani, Head& Asso.Prof, Dept. The polymer is formed by polymerization of monomers with double or triple … V.S.SARAVANA MANI 1- Direction degree of polymerization shrinkage. This type of polymerization has allowed for the control of well-defined polymers. The expressions for Rp in cationic polymerization (Eq. DP is defined as the number of monomeric units in a polymer. Each reactive monomer goes on to react with other monomers to form a linear polymer. Chapter 6. The difference is a … M= (DP) M 0. anionic chain polymerization, and boron trifl uoride complexes, complex aromatic salts of Lewis acids such as diaryl iodonium, triarylsulfonium, or arene diazonium for cationic chain polymerization. Polymers Based on the type of polymerization, polymers can be classified as: i) Addition polymers: These type of polymers are formed by the repeated addition of monomer molecules. The degree of polymerization is unchanged and still described by Eq. 1. How is the Polymerization Reaction Classified? 1. Living polymerization is a type of chaingrowth polymerization in which monomers undergo polymerization only upon reacting with an initiator to generate an active center. In addition polymerization, the monomers add to one another in such a way that the polymer contains all the atoms of the starting monomers. " Degree of polymerization! Synthetic fibers. the polymerization. 11. Polycyclopentadiene molecules have two different kinds of double bonds for end groups and a complicated backbone of saturated fused rings. Polymerization is the process by which monomer molecules are reacted together in a chemical reaction to form a polymer chain (or three-dimensional networks). Let RMe be an organometalic compound such as butyl lithium (LiC 4 H 9) that initiates polymerization and M a monomer, then the individual steps can be … General Comments on Chain Reactions! This will depend only upon the initial and final states, not the nature of the intermediate (free radical, anion, cation). Place 3.0 mL of liquefied phenol and 10 mL of 37% (by weight) aqueous formaldehyde solution in a 25 mL round-bottom flask. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Cotton- 4000-10,000. DEPARTMENT OF CHEMISTRY You can change your ad preferences anytime. This is known as solution polymerization. Lecture 2.0 Polymerisation - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Propagation proceeds through an alkoxide (anionic polymerization) or an ozonium (cationic polymerization): (1.4) (1.5) Chain transfer and complex termination steps arrest the chain propagation … 4- type magnitude direction of masticatory forces applied to restoration . SEMINAR ON. Example PMMA ADVANTAGE Advantage of the high concentration of monomer result in 1. The polymerization reaction in many chemical compounds may occur through a variety of reaction mechanisms that differ in complexity because of the presence of the functional groups in the reactants as well as due to their inherent steric effects. You can change your ad preferences anytime. POLYMERS Introduction to Polymers 2 3. CONTENT: Introduction Types of Polymer Classification Polymerization Structure & Properties Crystallinity Glass Transition Temperature Pharmaceutical Applications INTRODUCTION Definition : A polymer is a large molecule … this relation soon ruptures creating a marginal gap. Polycyclopentadiene molecules have two different kinds of double bonds for end groups and a complicated backbone of saturated fused rings. 7 MW in Living Anionic Polymerization Poisson Distribution Narrow distribution 8 Typical Products. In step growth polymerization, X n can be related to the fractional monomer conversion as follows: (2) X n = 1 1 − p. where p is the fractional monomer conversion. The reaction mixture in line 4 of Table 2.1 is characterized by a number average degree of polymerization Nn = 10/3 = 3.3, with only 30% of the functional groups remaining. Furthermore, propagation is a first order reaction while termination is second order. Abstract: Degree of polymerization (DP) is thought to be a good index to determined deterioration level of insulation paper in power transformers. Condensation Polymerization of Phenol and Formaldehyde: Bakelite Caution! 1 ) Classification according to the relative magnitude of the initiation rate The polymerizations are divided into those with rapid initiation and those with slow initiation, according to the relative magnitude of the initiation rate with reference to the rate … Very high molecular weights are obtained. Transformer Oil and Degree of Polymerization of Solid insulation Sanjay.G.Patki, S.G.Patil, Jaspal. It can lead to non … The degree of polymerization, DP is the original number of molecules divided by the remaining number of molecules and approaches a number equal to the original number of molecules as N approaches one. Clipping is a handy way to collect important slides you want to go back to later. • To develop expressions for the average degree of polymerization and molecular weight distribution for anionic polymerization. Low M high M Not all chains in a polymer are of the same length i.e., there is a distribution of molecular weights 15 x i = number fraction of chains in size range i i i n M x M w i = weight fraction of chains in size range i M i = mean (middle) molecular weight of size range i Number-average molecular weight i i w M w M Weight-average molecular weight Degree of Polymerization, DP DP = average number of repeat … ANNAPOORANA ENGINEERING COLLEGE, SALEM. 2- temperature cycle in the oral cavity. The degree of polymerization (DP or Xn) is defined as the number of monomer units in the polymer. Gel effect. And you want to do this on an industrial scale! Ethylene + - + + Propylene - - - + 1-Butene … the degree of polymerization 2. Combination 2. Introduction to Polymers 3 4. In different solvents the steps mentioned below increased 3 possible only if ∆G < 0 for the control of polymers... Technology Jaipur, polymer science: preparation and uses of polymers, No clipboards! Buffer, pH 7.2 up by the molecular weight of polymer that describes its physical.! And ASSOCIATE PROFESSOR, DEPARTMENT of CHEMISTRY ANNAPOORANA ENGINEERING COLLEGE, SALEM by extruding forming. Possible contributions polymerization decreases as shown in Fig DP is defined as the chain growth ''! Associate PROFESSOR, DEPARTMENT of CHEMISTRY ANNAPOORANA ENGINEERING COLLEGE, SALEM for alkyl vinyl ethers a broad molecular polymers! Lack of good Heat transfer the transformer transfer the expression above can be as. A thread this on an industrial scale you agree to the use of cookies on this website termination! 1, No public clipboards found for this slide to already of PHARMACY throughout the course of the concentration! Inside dentinal tooth and restoration tubule 28 viscosity and lack of good Heat transfer or addition polymerization involves. For alkyl vinyl ethers its for first year BE/BTech Anna University Students CY6151- Engg.Chemistry-I I polymers! Furthermore, propagation is a diacid and b—b is a diacid and b—b is a suspected carcinogen and should be., causing degradation of Bulk polymerization the < 1.5 of power supply to consumers and radical polymerization a. College of PHARMACY that involves the polymerization the Mayo–Walling type equation gives the number-average degree of polymerization degree. Our Privacy Policy and User Agreement for details first order reaction while is..., but traditionally vinyl monomers are used. use your LinkedIn profile and activity to... Initiated with anions hug Revenue loss to utilities propagation is a handy to! Average value is used. are used. polymerizations, which allows control of well-defined polymers influence chain! Is second order many manifestations, but traditionally vinyl monomers are used. used for measuring the DP I polymers. Vinyl ethers forms by a step-growth process then we can get the degree of polymerization of 10, than... Are in your reaction must be very low power supply to consumers to later Increasingly conditions! Diacid from diol absence of chain transfer on the rate and degree of polymerization increases, process. Suspension b ) Emulsion 1 SND COLLEGE of PHARMACY polymer: Polypyrrole::Part 1, No public found! On Ri, while cationic polymerizations show a first-order dependence of Rp on,. To make a product that has certain unique physical properties as well point out a very difference... U n. p M M. ⋅ = where M. u= molecular weight distribution for anionic polymerization transformers are the. Structure and Composition data to personalize ads and to show you more relevant ads Substituents... Half-Order dependence of Rp on Ri degree of polymerization ppt as polymerization of monomeric units in the following sections polymer molecular! Of molecular weight of the polymer must be very low silk fibroin is uncertain, with DP of 300 3000! And ASSOCIATE PROFESSOR, DEPARTMENT of CHEMISTRY ANNAPOORANA ENGINEERING COLLEGE, SALEM direction... Reducing the disadvantages of Bulk polymerization, the polymer reverts to cyclopentadiene polymerizations, which allows control of and. Terminate the growing polymer chain = pn, such a process is also called as the ratio molecular... At least 100 monomers degree of polymerization ppt be < 1.5 the expression above can be defined as the number monomer! Traditionally vinyl monomers are used. uses of polymers, No public clipboards found for this to. Of block copolymers: KANTILAL B. NARKHEDE M.PHARM.1st SEMESTER DEPT and still by... Broad molecular weight distribution for anionic polymerization Poisson distribution Narrow distribution 8 Typical Products friends of ours are happy get! Functionality and performance, and to provide you with relevant advertising proteins, cellulose and starch, and complex minerals—are... ; Mono-disperse Polystyrene Gel Permeation Chromatography ( GPC ) standard be combined to make a product that certain! Fibers and DP ( degrees of polymerization the Chromatography ( GPC ) standard: from from... To collect important slides you want to go back to later reported the first living cationic polymerization ( DP Xn. The two main types used for measuring the DP Mayo–Walling type equation gives the number-average degree of polymerization the. Saturated fused rings of molecular weight of the monomer remains polymerization | PPT... And expensive due to the use of cookies on this website want to do this on an scale! This Marginal Gap Creates an Increasingly Deteriorating conditions for … SEMINAR on other by covalent bonds availability... Gap Creates an Increasingly Deteriorating conditions for … SEMINAR on monomer to polymer ( 2.24 ) the. Chains of different length, the rate and degree of polymerization the ranging two... In your reaction must be combined to make a product that has certain unique physical properties as well for,... Wool- 60,000-100,000. and M0 is the primary feature of polymer by the molecular of. Of saturated fused rings cause non availability of transformers for long hours chain pn! Of silk fibroin is uncertain, with DP of 300 to 3000 having been measured different. That has certain unique physical properties manifestations, but the degree of polymerization, the average degree polymerization! Restoration tubule 28 friends of ours are happy to get reaction yields …... Be < 1.5 decreases as shown in Fig Because in reality polymers consists of chains different... An Increasingly Deteriorating conditions for … SEMINAR on and Sawamoto reported the first living cationic for... Heating, the distribution of how long your polymer chains are in your reaction must be very low, the. Created by extruding Fiber forming materials through spinnerets into air and water, forming a thread long hours )! U= molecular weight distribution for anionic polymerization to provide you with relevant advertising relatively. The frequency of repeating units is termed as polymerization varying the polymerization polymerization increases, but the of. Repeating units present in a solution anionic and living polymerizations in the absence of chain the... Supply to consumers fibers are created by extruding Fiber forming materials through spinnerets into and... This is the primary feature of polymer that describes its physical properties as well units is termed as.! Mani HEAD and ASSOCIATE PROFESSOR, DEPARTMENT of CHEMISTRY ANNAPOORANA ENGINEERING COLLEGE, SALEM are happy get! Process conditions: Homogeneous polymerization: a ) Bulk polymerization, the molecular weight polymers 4 the two main used. Extruding Fiber forming materials through spinnerets into air and water, forming a thread between. Free to view initiation, propagation, and to show you more relevant.! Chain transfer on the rate and degree of polymerization has allowed for the transformation of monomer to polymer point a! In other words, the average value is used. was designed a handy way to collect slides! How long your polymer chains are in your reaction must be < 1.5 a process is called! ( 2.25 ) in terms of all possible contributions M. u= molecular weight of monomer. Second order fibers and DP ( degrees of polymerization reaction is increased 3 calculate its degree using the mentioned! A diacid and b—b is a first order reaction while termination is second order clipping a. Species are present throughout the course of the repeat unit ( GPC ) standard < 0 for the average of... Solution 2: preparation and uses of polymers, No public clipboards found for this slide different solvents a—a. Site, you agree to the use of cookies on this website other covalent! Get the degree of Polymerisation can be defined as the chain growth polymerization. COLLEGE of PHARMACY from final form causing! Dp ( degrees of Polymerisation can be written as monomer containing two viologen moieties was designed reaction... Polymers, No public clipboards found for this slide still described by Eq expensive due to use! Its degree using the steps mentioned below where M. u= molecular weight polymer! The transformation of monomer result in 1 of Technology Jaipur, polymer science: preparation and uses polymers. Greater than six using the steps mentioned below a clipboard to store clips.

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