文献类型：期刊文献

英文题名：Improvement of Poly(ethylene terephthalate) Melt-Foamability by Long-Chain Branching with the Combination of Pyromellitic Dianhydride and Triglycidyl Isocyanurate

作者：Ge, Yukai[1];Yao, Shun[1];Xu, Menlong[1];Gao, Liang[1];Fang, Zhiying[1];Zhao, Ling[1,2];Liu, Tao[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]XinJiang Univ, Sch Chem & Chem Engn, Urumqi 830046, Peoples R China

年份：2019

卷号：58

期号：9

起止页码：3666

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20191006606553);WOS:【SCI-EXPANDED(收录号:WOS:000460996700011)】；

基金：This work was supported by the National Key Research and Development Program of China (2016YFB0302200) and the Fundamental Research Funds for the Central Universities (22221818014).

语种：英文

外文关键词：Molecular weight - Polymer melts - Strain hardening - Ethylene

摘要：Reactive processing on conventional poly(ethylene terephthalate) (PET) with the combination of pyromellitic dianhydride (PMDA) and triglycidyl isocyanurate (TGIC) was used to produce long-chain branched PET (LCB-PET). The branching factors of the PET samples were correlated from their intrinsic viscosity and molar mass results. In all PET samples without a cross-linked structure, PET modified with 0.1 wt % PMDA and 0.5 wt % TGIC (PET-P1T5) had the highest branching degree, with a branching factor of 0.84. The relaxation time spectra of the three modified PET samples with strain-hardening behaviors displayed rubbery states during the relaxation process, which was ascribed to their increased molecular weight or long-chain branched structure. Batch melt-foaming experiments with CO2 were carried out to evaluate the melt-foamability of PET. The results indicated that both a high molecular weight and long-chain branched structure, especially the latter, could efficiently lead to strong molecular entanglements and significantly improve the polymer melt-foamability.