Citation: Bao-jing Luo, Hong-fei Li, Wen-yang Zhang, Cheng-bo Zhou, Jing-qing Li, Cong-hua Lu, Xue-hao He, Shi-chun Jiang. Mechanistic Insights into the Shear Effects on Isotactic Polypropylene Crystallization Containing β-Nucleating Agent[J]. Chinese Journal of Polymer Science, ;2017, 35(5): 672-680. doi: 10.1007/s10118-017-1912-y shu

Mechanistic Insights into the Shear Effects on Isotactic Polypropylene Crystallization Containing β-Nucleating Agent

a.
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
b.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
c.
Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China

Corresponding author: Shi-chun Jiang, scjiang@tju.edu.cn
Received Date: 19 October 2016
Revised Date: 1 December 2016
Accepted Date: 6 December 2016

Fund Project: This work was financially supported by the National Natural Science Foundation of China Nos. 51573131, 51173130, 21274149 and 21374077

The crystalline structures and crystallization behaviors of iPP containing β nucleation agent TMB-5 (iPP/TMB-5) were investigated by synchrotron radiation wide angel X-ray diffraction (SR-WAXD), differential scanning calorimeter (DSC) and polarized light microscope (PLM). It was found that α-crystallization lagged behind β-crystallization at normal temperatures, but the discrepancy reduced with increasing temperature. TMB-5 could not induce β - iPP when the nucleation agent is wrapped up with α-crystal that crystallized at high temperatures. The polymorphic composition of iPP/TMB-5 was susceptible to the introductory moment of shear. New crystallization process of β-nucleated iPP was proposed to understand the experimental phenomena which could not be explained by those reported in the literature. It was supposed that polymer crystallization initiated from mesophase, and the formations of iPP crystals involved the organization of helical conformation ordering within mesophase. It was proposed that the iPP melt contained mesophases with stereocomplex-type ordering of right-handed and left-handed helical chains which could be disturbed by shear or TMB-5, leading to different polymorphic structures.
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