文献类型：期刊文献

英文题名：Rheological and foaming behaviors of long-chain branched polyamide 6 with controlled branch length

作者：Xu, Menglong[1,2];Lu, Jiawei[1];Zhao, Jinchuan[2];Wei, Linfeng[2];Liu, Tao[1];Zhao, Ling[1];Park, Chul B.[2]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Toronto, Dept Mech & Ind Engn, 5 Kings Coll Rd, Toronto, ON M5S 3G8, Canada

年份：2021

卷号：224

外文期刊名：POLYMER

收录：;EI(收录号：20211510197225);WOS:【SCI-EXPANDED(收录号:WOS:000647556500008)】；

基金：This research was funded by the National Key Research and Development Program of China, grant number 2016YFB0302200. Also, this research was supported by the China Scholarship Council (No. 201906740084) during the work at the University of Toronto.

语种：英文

外文关键词：PA6; Long-chain branched; Branch length; Strain hardening; Melt foamability

摘要：A series of long-chain branched polyamide 6 samples (LCB PA6s) with well-defined branch length were successfully fabricated via reactive extrusion by tuning various linear PA6s as reactive materials. Their structureproperty relationships were systematically investigated. The GPC-rheology method was performed to demonstrate the existence of LCB topological structure and quantitatively determine the relative branch length for three LCB PA6s. Rheological characterization showed that an increase in branch length resulted in the increased zeroshear viscosity and storage modulus at low frequency, reduced loss factor and high strain hardening coefficient under elongational flow, i.e., the enhanced elastic response and melt strength of PA6s. Finally, the melt foamability of the LCB PA6s were verified by batch foaming experiments with supercritical CO2 as the blowing agent. The LCB-Mb 4.5 with the longest branch length and highest melt strength appeared the biggest expansion ratio of 18.2 and broadest foaming window of 70 ?C, which was expected to be in production on a large scale through continuous extrusion foaming process.