Eq. SEMINAR ON. A failure can cause hug revenue loss to utilities. Wear gloves when handling and avoid contact with skin! Add 1.5 mL of … Polymer, molecular weight, property, polymerization, effect of molecular weight, chemical engineering, average molecular weight, degree of polymerization, injection molding, extrusion, polydipersity This will depend only upon the initial and final states, not the nature of the intermediate (free radical, anion, cation). One way of measurement of conversion is the degree of polymerization represented as DP or Xn. 1 / DP = 1 / DP 0 + C M + C S [S] / [M] The amount of chain … 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. Now customize the name of a clipboard to store your clips. This is known as solution polymerization. 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. Introduction To The Physical Chemistry Of Polymer. Macromolecules 1999 , 32 (1) , 73-78. Degree of polymerization. • Polymerization in the aqueous phase is insignificant due to the low monomer concentration. 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. Polymers are formed from repeating units of a monomer, which are linked to each other by covalent bonds. If no chain transfer reactions were possible, then the number … 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. Each reactive monomer goes on to react with other monomers to form a linear polymer. Ethylene molecules are joined together in long chains. Common synthetic fibers include: Nylon; Modacrylic; Olefin; Acrylic; … 2. n u n. p M M. ⋅ = where M. u= molecular weight (MW) of individual repeat units. Thus, the proportion of termination to propagation increases substantially with increasing free The degree of polymerization is unchanged and still described by Eq. Therefore an alternative method has been expected. 7.2. If you continue browsing the site, you agree to the use of cookies on this website. 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: … 8.45. POLYMERS Introduction to Polymers 2 3. Lecture 2.0 Polymerisation - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. 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. You can change your ad preferences anytime. 11. Now customize the name of a clipboard to store your clips. If you continue browsing the site, you agree to the use of cookies on this website. Clipping is a handy way to collect important slides you want to go back to later. OF P’CEUTICS, SND COLLEGE OF PHARMACY. 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. The degree of polymerization is the number of mono meric units in a macromolecule or polymer molecule . Concerning: Molecular Weight Rate (kinetics) Heat effects (thermodynamics) Bulk polymerization The. Further, you can calculate its degree using the steps mentioned below. Introduction to Polymers 1 2. Analysis of Conducting Polymer:Polypyrrole::Part 1, No public clipboards found for this slide. of Chemistry. Solution polymerization | PowerPoint PPT presentation | free to view . The polymer is formed by polymerization of monomers with double or triple … Degree of Polymerization. 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 … 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. General Comments on Chain Reactions! 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 … Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. How many monomers make up each polymer (the degree of polymerization) must be related linearly to the amount of monomer you started with. solid having a degree of polymerization n ranging from two to greater than six. ! A key characteristic … 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. The growth reaction takes place by the addition of one unit at a time to the active … Some Condensation Polymers. (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. National Institute of Technology Jaipur, polymer science: preparation and uses of,... Marginal Gap Creates an Increasingly Deteriorating conditions for … SEMINAR on of monomer, then we can get the of... 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