文献类型：期刊文献

英文题名：Isothermal and non-isothermal crystallization of isotactic polypropylene in the presence of an α nucleating agent and zeolite 13X

作者：Meng, Xin[1];Gong, Weiguang[1];Chen, Weijie[1];Shi, Yaoqi[1];Sheng, Yan[1];Zhu, Shengjie[1];Xin, Zhong[1]

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

年份：2018

卷号：667

起止页码：9

外文期刊名：THERMOCHIMICA ACTA

收录：;EI(收录号：20182905572556);WOS:【SCI-EXPANDED(收录号:WOS:000444663600002)】；

基金：The authors are grateful to the financial support provided by the Ministry of Science and Technology of the People's Republic of China (The People's Republic of China 863 Program [Grant No. 2015AA034003]), and the financial support of the National Natural Science Funds of China (Grant No. 21776079).

语种：英文

外文关键词：Zeolite; Isotactic polypropylene; Crystallization kinetics; Nucleating agent

摘要：The isothermal and non-isothermal crystallization kinetics of isotactic polypropylene (iPP) and iPP nucleated with the nucleating agent sodium 2,2'-methylene-bis(4,6-di-tertbutylphenyl)-phosphate (NA11), zeolite 13X (Z13X), and both NAll and Z13X were investigated. First, isothermal crystallization analyses show that the iPP/NA11/Z13X system provided the smallest half-crystallization time compared with the other three iPP systems even though a smaller amount of NAll was added in the iPP/NA11/Z13X system (0.08 wt%) relative to that of the iPP/NA11 system (0.2 wt%). Moreover, the fold surface energy of the iPP/NA11/Z13X system was also the least among all samples considered. Then, during non-isothermal crystallization, the iPP/NA11/Z13X system demonstrated the smallest value of F(T), indicating that the required cooling rate to attain a specified relative crystallinity for the system was the lowest among all systems considered. Furthermore, a comparison of the crystallization activation energy shows that the NAll and NA11/Z13X additives primarily improved the crystallization of iPP through an acceleration of the nucleation process. Finally, polarized optical microscopy results show that the NA11 and Z13X additives affected only the crystallization kinetics of iPP, and did not affect the crystallization morphology.