文献类型：期刊文献

英文题名：A highly active and selective β-nucleating agent for isotactic polypropylene and crystallization behavior of β-nucleated isotactic polypropylene under rapid cooling

作者：Zhao, Shicheng[1];Gong, Hanzhang[1];Yu, Xin[1];Xin, Zhong[1];Sun, Shibao[1];Zhou, Shuai[1];Shi, Yaoqi[1]

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

年份：2016

卷号：133

期号：32

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20161902366458);WOS:【SCI-EXPANDED(收录号:WOS:000378429900026)】；

基金：The authors gratefully acknowledge the National Natural Science Foundation of China (Grants 21476085) for financial support.

语种：英文

外文关键词：crystallization; mechanical properties; polyolefins

摘要：Zinc adipate (Adi-Zn) was observed to be a highly active and selective beta-nucleating agent for isotactic polypropylene (iPP). The effects of Adi-Zn on the mechanical properties and the beta-crystals content of nucleated iPP were investigated. The impact strength of iPP nucleated with 0.2 wt % Adi-Zn was 1.8 times higher than that of neat iPP. In addition, wide-angle X-ray diffraction analysis indicated that the content of beta-crystals in nucleated iPP (k(beta) value) reached 0.973 with 0.1 wt % Adi-Zn, indicating that Adi-Zn is a highly active and selective beta-nucleating agent for iPP. Furthermore, fast scanning chip calorimetry (FSC) studies using cooling rates from 60 to 13,800 degrees C min(-1) revealed that the formation of beta-crystals significantly depended on the cooling rates. At cooling rates below 3000 degrees C min(-1), only beta-crystals existed. However, at cooling rates above 6000 degrees C min(-1), beta-crystals failed to form. Moreover, a lower critical crystallization temperature that corresponded to the generation of beta-crystals was investigated using cooling-induced crystallization, and the results are in good agreement with those of a previous study. (C) 2016 Wiley Periodicals, Inc.