Kinetic Investigation of the Emulsion Polymerization of Vinylidene Fluoride

IF 1.8 4区 工程技术 Q3 ENGINEERING, CHEMICAL
Burak Hanamirian, Azzurra Agostini, Isabelle Chaduc, Giulio Brinati, Bradley Kent, Giuseppe Storti, Mattia Sponchioni
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引用次数: 0

Abstract

Poly(vinylidene fluoride) (PVDF) is among the most produced fluoropolymers, second only to polytetrafluoroethylene. Despite its popularity, the complex microstructural properties achieved during the polymerization are not well documented in the literature. In particular, available models only track the chain length distribution of the polymer, while neglecting the distribution of other important properties, affecting the final behavior of the product. In this work, a 2D kinetic model, evaluating not only the chain length but also the number of terminal double bonds (TDBs) per chain, is developed. The numerical solution of the model is achieved by fractionating the population of polymer chains into classes with a specific number of TDBs and using the method of moments for each class. The model results are compared with experimental evidences for the amount of produced polymer, moles of main chain-ends, number, and weight average molecular weight as well as full molecular weight distribution. Based on this comparison, kinetic parameters are estimated by optimization using genetic algorithm. The model reliability is finally verified using additional experimental data at different temperatures and amounts of initiator.

Abstract Image

偏氟乙烯乳液聚合动力学研究
聚偏氟乙烯(PVDF)是产量最大的含氟聚合物之一,仅次于聚四氟乙烯。尽管它很受欢迎,但在聚合过程中获得的复杂微观结构性能在文献中没有很好的记录。特别是,现有的模型只跟踪聚合物的链长分布,而忽略了影响产品最终行为的其他重要性质的分布。在这项工作中,建立了一个二维动力学模型,不仅评估了链长,而且还评估了每个链的末端双键(tdb)的数量。该模型的数值解是通过将聚合物链的总体划分为具有特定数量的tdb的类别,并对每个类别使用矩量法来实现的。将模型结果与实验结果进行了比较,得到的聚合物数量、主链端摩尔数、分子量、平均分子量和全分子量分布。在此基础上,利用遗传算法对动力学参数进行优化估计。最后用不同温度和不同引发剂用量下的附加实验数据验证了模型的可靠性。
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来源期刊
Macromolecular Reaction Engineering
Macromolecular Reaction Engineering 工程技术-高分子科学
CiteScore
2.60
自引率
20.00%
发文量
55
审稿时长
3 months
期刊介绍: Macromolecular Reaction Engineering is the established high-quality journal dedicated exclusively to academic and industrial research in the field of polymer reaction engineering.
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