高分子材料加工技术专业英语 Step-Growth Polymerization 缩合聚合 VS 连锁聚合.pptVIP

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高分子材料加工技术专业英语 Step-Growth Polymerization 缩合聚合 VS 连锁聚合.ppt

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逐步聚合 VS连锁聚合 The monomers can only react with the active site to form a new active center, and the monomers can not react with each other. The polymerization process is generally composed of several elementary reactions, and the reaction rate and activation energy of each elementary reaction are very different. The reaction products are monomers, polymerized products and trace initiators. The molecular weight of polymerized products generally does not vary with monomer conversion. (except for active polymerization). Chain initiation： Chain propagation： Chain termination： * 整个过程瞬间完成 According to different active centers: Free radical polymerization; Anionic polymerization; Cationic polymerization; Coordination ion polymerization. (1) the reaction is progressively carried out through the reaction between monomer functional groups. (2) the rate and activation energy of each step are approximately the same. (3) the reaction system is always composed of a series of increasing molecular weight of intermediate products and monomers monomers and/or any intermediate products can react with each other. (4) the molecular weight of the polymerization product is gradually increasing, and only high conversion rate can produce high molecular weight polymer. The most important feature: Any two molecules (monomer or polymerization product) in the polymerization system can react with each other to form a higher degree of polymerization molecule.