Chain extension and branching of poly(ethylene terephthalate) (PET) with di- and multifunctional epoxy or isocyanate additives: An experimental and modelling study
Chain extension and branching of poly(ethylene terephthalate) (PET) with di- and multifunctional epoxy or isocyanate additives: An experimental and modelling study
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DOI：
10.1016/j.reactfunctpolym.2011.10.007
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发表时间：
2012-01-01
影响因子：
5.1
通讯作者：
Castelvetro, Valter
中科院分区：
文献类型：
--
作者：
Raffa, Patrizio;Coltelli, Maria-Beatrice;Castelvetro, Valter
研究了1，6-二异氰酸酯基己烷（NCO）和1，4-丁二醇二缩水甘油醚（EPOX）两种双官能团扩链剂对消费后聚对苯二甲酸乙二醇酯（r-PET）反应性熔融加工的影响。比较评价了在间歇式混合器中加工期间的扭矩演变和通过SEC分析测定的扩链r-PET的分子量。这里提出的一个简单的数学模型被用来拟合得到的分子量。两个多官能度的扩链剂，聚（苯基异氰酸酯-共-甲醛）（P-NCO）和苯乙烯-丙烯酸酯共聚物轴承环氧基团（P-EPOX），也被使用，并通过分析扭矩和熔体流动速率数据，它们的反应性进行了比较与双官能度的。两个官能团的不同反应性和最终聚合物的结构（取决于扩链剂的类型，是直链的还是支链的）影响改性的r-PET的结晶行为和拉伸性能。预期通过合适的扩链剂选择和配方来微调后者的性质。(C)2011爱思唯尔有限公司保留所有权利。
The effect of two difunctional chain extenders, 1,6-diisocyanatohexane (NCO) and 1,4-butanediol diglycidyl ether (EPOX), in the reactive melt-processing of a post-consumer poly(ethylene terephthalate) (r-PET) was investigated. The torque evolution during processing in a batch mixer and the molecular weight of the chain-extended r-PET, as determined by SEC analysis, were comparatively evaluated. A simple mathematical model proposed here was used to fit the obtained molecular weights. Two polyfunctional chain extenders, poly(phenyl isocyanate-co-formaldehyde) (P-NCO) and a styrene-acrylate copolymer bearing epoxide groups (P-EPOX), were also used and their reactivity was compared with that of the difunctional ones by analysing torque and melt flow rate data. The different reactivity of the two functional groups and the structure of the final polymer (either linear or branched depending on the type of chain extender) affect both crystallization behaviour and tensile properties of the modified r-PET. Fine tuning of the latter properties by suitable chain extender(s) selection and formulation is anticipated. (C) 2011 Elsevier Ltd. All rights reserved.