文献类型：期刊文献

英文题名：The Trommsdorff effect under shear and bulk polymerization of methyl methacrylate via reactive extrusion

作者：Zhan, Pengfei[1];Chen, Jianding[1];Zheng, Anna[1];Shi, Han[1];Chen, Fuxiu[1];Wei, Dafu[1];Xu, Xiang[1];Guan, Yong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2020

卷号：122

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;EI(收录号：20194807747687);WOS:【SCI-EXPANDED(收录号:WOS:000509784900047)】；

基金：The authors thank a lot for the financial support from the National Natural Science Foundation of China (No. 51373052, No. 51573043).

语种：英文

外文关键词：Trommsdorff effect; Shear rate; Reactive extrusion; PMMA

摘要：In this study, a concentric-cylinder and double-walled reactor accurately controlling shear rates was established to conduct the free radical bulk polymerization of methyl methacrylate, and the kinetics of Trommsdorff effect under constant shear was investigated. The results showed that increasing shear rate significantly enhanced the termination rate constant (k(t)), and thus effectively weakened and postponed the Trommsdorff effect. However, the polymerization rate during the "quasi-steady state" was almost not affected by shear rate. Differing from the classical theory, the chain initiation rate (R-i) also increased with shear rate, which was due to the improving initiation efficiency of polymerization reaction. On the other hand, it was found that the critical viscosity when Trommsdorff effect occurred was about 1000 +/- 100 Pa.s, independent of shear rates, temperatures and initiator concentrations. Based on utilizing the Trommsdorff effect, polymethyl methacrylate (PMMA) was further synthesized via reactive extrusion, with superior performance comparing to commercial product.