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Effect of continuous oscillatory shear on isothermal crystallization of non‐nucleated and nucleating‐agent‐treated isotactic polypropylene assessed by dynamic mechanical analysis
Author(s) -
Chen Lan,
Ma ChuanGuo,
Wang HaiYan,
Zhang JinXiu,
Xiong XiaoMin
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41685
Subject(s) - crystallization , nucleation , tacticity , materials science , differential scanning calorimetry , polypropylene , isothermal process , composite material , polymer chemistry , shear (geology) , kinetics , chemical engineering , thermodynamics , polymer , polymerization , physics , quantum mechanics , engineering
Using dynamic mechanical analysis (DMA), we investigated the in situ crystallization kinetics of non‐nucleated and nucleating‐agent‐treated isotactic polypropylene ( i PP) under continuous oscillatory shear during the entire crystallization process, and then compared the DMA results with those measured using differential scanning calorimetry under conventional quiescent crystallization. Our analyses, based on the Avrami equation, show that continuous oscillatory shear accelerated crystallization of non‐nucleated i PP, but interfered with crystallization for nucleating‐agent‐treated i PP. Our results indicate that, for the present nucleating agent, its accelerating effect on crystallization cannot coexist with the accelerating effect of shear on crystallization. We attributed this difference to the disruptive effect of shear on growth and the different nucleation models of non‐nucleated and nucleating‐agent‐treated i PP. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41685.