Strain and temperature dependence of deformation mechanism of lamellar stacks in HDPE and its guidance on microporous membrane preparation

被引：51

作者：

Li, Xueyu ^{[1
]}

Lin, Yuanfei ^{[1
]}

Ji, Youxin ^{[1
]}

Meng, Lingpu ^{[1
]}

Zhang, Qianlei ^{[1
]}

Zhang, Rui ^{[1
]}

Zhang, Wenhua ^{[1
]}

Li, Liangbin ^{[1
]}

机构：

[1] Univ Sci & Technol China, CAS Key Lab Soft Matter Chem, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China

来源：

POLYMER | 2016年 / 105卷

基金：

中国国家自然科学基金;

关键词：

Cold stretching; Micropore formation; Degree of lamellar separation; HIGH-DENSITY POLYETHYLENE; X-RAY-SCATTERING; SEMICRYSTALLINE POLYMERS; POLY(ETHER ESTER); SMALL-ANGLE; ELEVATED-TEMPERATURES; TENSILE DEFORMATION; ROOM-TEMPERATURE; CRYSTALLINE-STRUCTURE; UNIAXIAL DEFORMATION;

D O I：

10.1016/j.polymer.2016.10.043

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Aiming to unveil the effect of cold stretching conditions including strain and temperature on the morphology and performance of membrane product, high density polyethylene (HDPE) microporous membranes were prepared by uniaxial stretching. The evolutions of lamellar stacks and micropore formation were tracked by combining in-situ and ex-situ X-ray scattering and scanning electron microscopy methods. It was found that cold stretching strain mainly affected separation degree of lamellar stacks under strain lower than 60%, while slip of crystal at higher strain. As for cold stretching temperature, stretching below 60 degrees C can promote separation of lamellar stacks, while stretching over 80 degrees C is beneficial to pull out molecular chains from lamellae, resulting in fibrils. A linear relation between separation degree of lamellar stack and air permeability of final membrane was established, which can provide guidance for producing HDPE microporous membranes with high performance. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：264 / 275

页数：12

共 62 条

[1] Battery separators [J].