文献类型：期刊文献

英文题名：In situ generation of a self-dispersed β-nucleating agent with increased nucleation efficiency in isotactic polypropylene

作者：Zhao, Shicheng[1];Qin, Wei[1];Xin, Zhong[1];Zhou, Shuai[1];Gong, Hanzhang[1];Ni, Yeming[1];Zhang, Ke[1]

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

年份：2018

卷号：151

起止页码：84

外文期刊名：POLYMER

收录：;EI(收录号：20183705805677);WOS:【SCI-EXPANDED(收录号:WOS:000442400300010)】；

基金：This work was financially supported by the Natural Science Foundation of China (Grants 21476085 and 21606084), National Key R&D Program of China (2016YFB0302201) and the Fundamental Research Funds for the Central Universities (22221818014). The authors greatly appreciate Professor Chih-Chia Cheng of National Taiwan University of Science and Technology Directorate for his fruitful discussion on FTIR data and essential contribution to this research.

语种：英文

外文关键词：Polypropylene; Nucleating agent; Crystallization

摘要：Addition of a beta-nucleating agent (beta-NA) is the most effective method of preparing beta-nucleated isotactic polypropylene (beta-iPP); however, the poor dispersion and agglomeration of beta-NAs limit nucleation efficiency. To solve this problem, a self-dispersing beta-NA strategy was developed based on in situ preparation of beta-NA (instead of pre-addition) during the processing of iPP. Zinc adipate (ZnAA), a typical beta-NA, was chosen; self-dispersed ZnAA (ZnAA(IS)) was prepared in situ from its reaction precursors adipic acid (AA) and zinc oxide (ZnO) during extrusion of iPP. In situ preparation of ZnAA(IS) led to a significantly higher nucleation efficiency than pre-addition of ZnAA. The beta-crystal content (k(beta) value) of nucleated iPP prepared with ZnAA(IS) reached 0.99, significantly higher than iPP prepared with ZnAA. Moreover, the impact strength of 0.1 wt % ZnAA(IS)/iPP composites was nearly 5.3-fold higher than neat iPP with a net gain in reinforcement (157%) compared to pre-addition of ZnAA. To explain these phenomena, we proposed mechanism for the self-dispersion of beta-NA in the context of in situ generation of beta-NA during iPP processing; the mechanism was confirmed by Fourier Transform Infrared Spectroscopy (FTIR), Polarized Optical Microscopy (POM), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) data. Therefore, this strategy and method of preparing beta-NA in situ offers unique advantages that will advance the production and application of beta-iPP. Furthermore, this strategy could potentially be extended to solve issues of poor dispersion and agglomeration for other additives. (C) 2018 Elsevier Ltd. All rights reserved.