Study on the Creep Behavior of Polypropylene

被引：23

作者：

Liu, Xiaolin ^{[1
]}

Huang, Yajiang ^{[1
]}

Deng, Cong ^{[2
]}

Wang, Xiaojun ^{[2
]}

Tong, Wei ^{[1
]}

Liu, Yuxin ^{[1
]}

Huang, Jianqian ^{[1
]}

Yang, Qi ^{[1
]}

Liao, Xia ^{[1
]}

Li, Guangxian ^{[1
]}

机构：

[1] Sichuan Univ, State Key Lab Polymer Mat Engn, Coll Polymer Sci & Engn, Chengdu 610065, Peoples R China

[2] Sichuan Univ, Anal & Testing Ctr, Chengdu 610065, Peoples R China

来源：

POLYMER ENGINEERING AND SCIENCE | 2009年 / 49卷 / 07期

基金：

中国国家自然科学基金;

关键词：

NONLINEAR CREEP; DEGRADATION;

D O I：

10.1002/pen.21330

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The creep behavior and creep failure law of polypropylene (PP) were investigated by using a multifunctional stress-aging testing machine under different aging environmental conditions (temperature, UV, and stress). Photoinduced changes in samples were studied using gel permeation chromatography and X-ray photoelectron spectrometer. Surface morphologies were also observed by scanning electron microscopy. It was found that there is a critical failure strain (epsilon(crit)) for PP during the creep course. Once the creep deformation exceeds the epsilon(crit) creep failure of PP takes place very rapidly. The value Of epsilon(crit) is independent of the tensile stress and UV irradiation, whereas it is only affected by the temperature and the nature of the PP, such as molecular weight and molecular structure. With increasing temperature, the value Of epsilon(crit) increases gradually. In addition, the creep rate of PP increases rapidly with increasing tensile stress and temperature as well as under irradiation with UV light. This study may provide a new way to predict the service lifetime of PR POLYM. ENG. SCI., 49:1375-1382, 2009. (C) 2009 Society of Plastics Engineers

引用

页码：1375 / 1382

页数：8

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