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Evolution of molecular weight and long chain branch distributions in olefin-diene copolymerization

机译:烯烃-二烯共聚过程中分子量和长链支链分布的演变

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摘要

A model for olefin-diene copolymerization and long chain branch formation was developed. The model shows that the number-average molecular weight and branching density increases linearly with time in a semi-batch polymerization, while the polydispersity depends on the diene content in the polymer and on the polymerization time. For low diene fractions or low polymerization times, the polydispersity increases linearly with time. For higher diene contents, the polydispersity increases exponentially with polymerization time after a critical polymer concentration is reached. The calculated distributions of branched species indicate that diene content influences the amount of highly branched chains produced in the polymerization, markedly broadening the distribution of molecular weight and leading to gel formation. [References: 25]
机译:建立了烯烃-二烯共聚和长链支链形成的模型。该模型表明,在半间歇聚合中,数均分子量和支化密度随时间线性增加,而多分散性取决于聚合物中的二烯含量和聚合时间。对于低二烯分数或低聚合时间,多分散度随时间线性增加。对于较高的二烯含量,在达到临界聚合物浓度后,多分散度随聚合时间呈指数增长。计算出的支链物种的分布表明,二烯含量会影响聚合反应中产生的高度支链的数量,从而显着拓宽分子量分布并导致形成凝胶。 [参考:25]

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