文献类型：期刊文献

英文题名：Zinc pimelate as an effective β-nucleating agent for isotactic polypropylene at elevated pressures and under rapid cooling rates

作者：Qin, Wei[1];Liu, Kehua[1];Xin, Zhong[1];Ling, Hao[1];Zhou, Shuai[1];Zhao, Shicheng[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：3

期号：3

外文期刊名：POLYMER CRYSTALLIZATION

收录：WOS:【ESCI(收录号:WOS:000539555000001)】；

基金：Fundamental Research Funds for the Central Universities, Grant/Award Number: 222201717025; National Natural Science Foundation of China (CN), Grant/Award Number: 21878089

语种：英文

外文关键词：isotactic polypropylene; pressure; rapid cooling rates; zinc pimelate; beta-nucleating agent

摘要：Along with the pressure and cooling rate, beta-nucleating agents (beta-NAs) can enhance the formation of beta-crystals during the processing of isotactic polypropylene (iPP), controlling both the polymorphic structure and properties of the resulting iPP product. In this study, we found that synthetic zinc pimelate (ZnPA) is a highly active and selective beta-NA, with the relative beta-crystal content (k(beta)) reaching 0.99 after its addition to polypropylene at 0.1 wt%. Using high-pressure differential scanning calorimetry (HP-DSC) to study the static pressure effect of ZnPA on the nucleation ability of beta-iPP, we found that a N(2)atmosphere lowered the crystallization temperature of polypropylene, while a He atmosphere accelerated the crystallization process upon increasing the pressure. Flash-DSC revealed that a lower cooling rate (<20 degrees C/s) benefited the formation of beta-crystals. This work could reveal the instability of beta-NAs during the commercial application.