文献类型：期刊文献

英文题名：Preparation and characterization of high melt strength thermoplastic polyester elastomer with different topological structure using a two-step functional group reaction

作者：Jiang, Rui[1,2];Chen, Yichong[1];Yao, Shun[1];Liu, Tao[1];Xu, Zhimei[1];Park, Chul B.[2];Zhao, Ling[1,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Toronto, Dept Mech & Ind Engn, Microcellular Plast Mfg Lab, Toronto, ON M5S 3G8, Canada;[3]Xinjiang Univ, Coll Chem & Chem Engn, Urumqi 830046, Peoples R China

年份：2019

卷号：179

外文期刊名：POLYMER

收录：;EI(收录号：20192807167104);WOS:【SCI-EXPANDED(收录号:WOS:000487254600037)】；

基金：This work is supported by the National Key Research and Development Program of China (2016YFB0302200) and National Science Foundation of China (21878256).

语种：英文

外文关键词：Elastomer foams; Chain structure; Rheology; Crystallization

摘要：Long-chain branched (LCB) thermoplastic polyester elastomer (TPEE) could be controllably prepared by the two-step reaction of the linear TPEE with triglycidyl isocyanurate (TGIC) and 2,2'-bis(2-oxazoline) (2,2'-BOZ) together in different sequences to improve their rheological properties and foaming ability. All of the modified TPEEs reacted with TGIC first and then with 2,2'-BOZ have more branching points and longer chains. These samples show a higher molecular weight, a broader molecular weight distribution. These samples also had a higher viscosity and modulus, a longer relaxation time, and a stronger strain-hardening effect. Moreover, the greater number of branching points accelerated the non-isothermal crystallization process. The foaming ability of the modified TPEEs was evaluated via a batch CO2-foaming process. The LCB structure improved the melt viscoelasticity and the foaming ability remarkably. The TPEE samples with more chain branching points and longer chains had the highest cellular densities and the largest expansion ratios, with average cell diameters of 4-13 mu m, cell densities of 2.0 x 10(9)-1.0 x 10(11) cells/cm(3), and expansion ratios of 2.5-14.1.