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Study on the creep behavior of polypropylene
Author(s) -
Liu Xiaolin,
Huang Yajiang,
Deng Cong,
Wang Xiaojun,
Tong Wei,
Liu Yuxin,
Huang Jianqian,
Yang Qi,
Liao Xia,
Li Guangxian
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21330
Subject(s) - creep , materials science , polypropylene , ultimate tensile strength , composite material , scanning electron microscope , stress (linguistics) , irradiation , philosophy , linguistics , physics , nuclear physics
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 (ε crit ) for PP during the creep course. Once the creep deformation exceeds the ε crit , creep failure of PP takes place very rapidly. The value of ε 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 ε 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 PP. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers