拉伸和热处理对iPP挤出拉伸薄膜晶体结构的影响.doc

文档介绍：
拉伸和热处理对 iPP 挤出拉伸薄膜晶体结构
的影响#
张典1,2,张晓黎1,2,王冰花1,2,陈静波1,2**
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(1. 郑州大学材料科学与工程学院,郑州 450001;
2. 橡塑模具国家工程研究中心,郑州 450002)
摘要:本文主要研究了小应变热处理对等规聚丙烯(iPP)拉伸薄膜晶体结构的影响,选用
了三种分子量大小与分布不同的等规聚丙烯(iPP),通过 Hakke 挤出机制备 iPP 薄膜,然
后在 140℃、小应变条件下对薄膜退火 10min。利用广角 X 射线衍射(WAXD)、差示扫描
量热仪(DSC)研究小应变退火以及牵引速率对 iPP 拉伸薄膜晶体结构的影响。在牵引速率
为 20~50cm/min 时,WAXD 和 DSC 结果表明小应变退火后结晶度有明显的提高,对熔点几
乎没有影响,另外退火后β晶含量减少,基本消失;WAXD 结果表明小应变退火后晶相取
向和非晶相取向度都有所提高。
关键词:等规聚丙烯;热处理;结晶度;取向
中图分类号:TB324
Effect of Stretching and Heat Treatment on the
Crystallization Structure of Extruded Stretching iPP Film
ZHANG Dian1,2, ZHANG Xiaoli1,2, WANG Binghua1,2, CHEN Jingbo1,2
(1. School of Material Science and Engineering of Zhengzhou University, Zhengzhou 450001;
2. National Enigneering Research Center for Advanced Polymer Processing Technology,
Zhengzhou 450002)
Abstract: In this paper, the effect of small strain heat treatment on crystallization structure of
extruded stretching iPP films. Three types of different molecular weight iPP were selected to be
extruded by Hakke extruder. The extruded stretching films were further heat-treated by the small
strain at 140℃ for 10min. WAXD and DSC were used to identified the structure changings of iPP
at different annealling and pulling rate conditions. After the annealling heat treatment, WAXD and
DSC results shown that the degree of crystallization