文献类型：期刊文献

英文题名：Improving the Continuous Microcellular Extrusion Foaming Ability with Supercritical CO2 of Thermoplastic Polyether Ester Elastomer through In-Situ Fibrillation of Polytetrafluoroethylene

作者：Jiang, Rui[1,2];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：11

期号：12

外文期刊名：POLYMERS

收录：;EI(收录号：20200708159440);WOS:【SCI-EXPANDED(收录号:WOS:000507624500076)】；

基金：This research was funded by the National Key Research and Development Program of China, grant number 2016YFB0302200.

语种：英文

外文关键词：supercritical carbon dioxide; extrusion foaming; in-situ fibrillation; TPEE

摘要：In-situ fibrillated polytetrafluoroethylene (PTFE) enhanced nanocomposites were successfully prepared by mixing thermoplastic polyether ester elastomer (TPEE) and PTFE using a twin-screw extruder. Well-dispersed, long aspect ratio PTFE nanofibrils with a diameter of less than 200 nm were generated and interwoven into networks. Differential scanning calorimetry and in-situ polarized optical microscopy showed that the PTFE nanofibrils can greatly accelerate and promote crystallization of the TPEE matrix and the crystallization temperature can be increased by 6 degrees C. Both shearing and elongational rheometry results confirmed that the introduction of PTFE nanofibrils can significantly improve the rheological properties. The remarkable changes in the strain-hardening effect and the melt viscoelastic response, as well as the promoted crystallization, led to substantially improved foaming behavior in the continuous extrusion process using supercritical CO2 as the blowing agent. The existing PTFE nanofibrils dramatically decreased the cell diameter and increased cell density, together with a higher expansion ratio and more uniform cell structure. The sample with 5% PTFE fibrils showed the best foaming ability, with an average diameter of 10.4-14.7 mu m, an expansion ratio of 9.5-12.3 and a cell density of 6.6 x 10(7)-8.6 x 10(7) cells/cm(3).