Comparison of the Structural Evolution ofβPolypropylene during the Sequential and Simultaneous Biaxial Stretching Process

作     者：Dao-Xin Zhang Lei Ding Feng Yang Fang Lan Ya Cao Ming Xiang Dao-Xin Zhang;Lei Ding;Feng Yang;Fang Lan;Ya Cao;Ming Xiang

作者机构：State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan UniversityChengdu 610065China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2021年第39卷第5期

页      面：620-631,I0008页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：supported by the National Natural Science Foundation of China(No.51721091) 

主　　题：βPolypropylene Simultaneous biaxial stretching Sequential biaxial stretching Structure evolution 

摘      要：In this work,the lamellar structural evolution and microvoids variations of βpolypropylene(β-PP)during the processing of two different stretching methods,sequential biaxial stretching and simultaneous biaxial stretching,were investigated in *** was found that different stretching methods led to significantly different lamellae deformation modes,and the microporous membranes obtained from the simultaneous biaxial stretching exhibited better mechanical *** the sequential biaxial stretching,abundant coarse fibers originated from the tight accumulation of the lamellae parallel to the longitudinal stretching direction,whereas the lamellae perpendicular to the stretching direction were easily deformed and *** coarse fibers were difficult to be separated to form micropores during the subsequent transverse stretching process,resulting in a poor micropores ***,for the simultaneous biaxial stretching,theβcrystal had the same deformation mode,that is,the lamellae distributed in different directions were all destroyed,forming abundant microvoids and little coarse fibers.