Concerning: Molecular Weight Rate (kinetics) Heat effects (thermodynamics) Bulk polymerization The. At an average degree of polymerization of 10, less than 1 weight percent of the monomer remains. 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. Also, the polymerization reactions for Nylon 6 and Spandex do not proceed by elimination of water or other small molecules. In 1984, Higashimura and Sawamoto reported the first living cationic polymerization for alkyl vinyl ethers. 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 … There are 3 mechanisms of termination: 1. Clipping is a handy way to collect important slides you want to go back to later. The degree of polymerization will increase steady during the whole polymerization process. See our User Agreement and Privacy Policy. Therefore an alternative method has been expected. Anionic addition polymerization is a form of chain-growth polymerization or addition polymerization that involves the polymerization of monomers initiated with anions. Abstract: Degree of polymerization (DP) is thought to be a good index to determined deterioration level of insulation paper in power transformers. 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. (2.24) into the Mayo–Walling type equation gives the number-average degree of polymerization as given in Eq. If you continue browsing the site, you agree to the use of cookies on this website. The degree of polymerization is the number of mono meric units in a macromolecule or polymer molecule . (2) shows that a high monomer conversion in step … 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. Malaviya National Institute Of Technology Jaipur, Polymer science: preparation and uses of polymers, No public clipboards found for this slide. A key characteristic … 2. n u n. p M M. ⋅ = where M. u= molecular weight (MW) of individual repeat units. Polycyclopentadiene molecules have two different kinds of double bonds for end groups and a complicated backbone of saturated fused rings. There are two commonly used and numerically different ways of expressing the … Cotton- 4000-10,000. M= (DP) M 0. 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. Learn more about polymerization. Now customize the name of a clipboard to store your clips. How many monomers make up each polymer (the degree of polymerization) must be related linearly to the amount of monomer you started with. How is the Polymerization Reaction Classified? Solvent may terminate the growing polymer chain, leading to low molecular weight polymers 4. •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) Initiation, propagation, and termination reactions have different rates and mechanisms. Eq. The polymer is formed by polymerization of monomers with double or triple …

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