ZHOU Zhi-hong, HE Yao-long, HU Hong-jiu, ZHAO Fengdoi: 10.3879/j.issn.1000-0887.2012.09.003
Citation: ZHOU Zhi-hong, HE Yao-long, HU Hong-jiu, ZHAO Feng<, ZHANG Xiao-long. Investigation on Creep Performance of PVC Aged at Relatively Near to Glass Transition Temperature[J]. Applied Mathematics and Mechanics, 2012, 33(9): 1056-1063. doi: 10.3879/j.issn.1000-0887.2012.09.003

Investigation on Creep Performance of PVC Aged at Relatively Near to Glass Transition Temperature

doi: 10.3879/j.issn.1000-0887.2012.09.003
  • Received Date: 2012-03-16
  • Rev Recd Date: 2012-05-03
  • Publish Date: 2012-09-15
  • In order to predict mechanical performance of PVC at high operating temperature, a series of shortterm tensile creep tests (one-tenth the physical aging time) of PVC were carried out at 63°C imposing a small constant stress using a dynamic mechanical analyzer (DMA). The StruikKohlrausch (SK) formula and Struik shift factor method were attempted to describe these creep data for various physical aging times. A new phenomenological model based on multiple relaxation mechanisms of amorphous polymer was developed to quantitatively describe the SK parameters (initial creep compliance, characteristic retardation time and shape factor) determined by aging times. It was shown that momentary creep compliance curve of PVC at 63℃ coudle be very well fitted by SK formula for each aging time, respectively. However, the SK parameters for the creep curves are not constant during aging process at elevated temperatures, and the evolution of these parameters and creep rate versus aging time curves at double logarithmic coordinates have showed obvious nonlinear phenomenon. Moreover, the creep master curves obtained by the superposition with Struik shifting methods are unsatisfactory in such case. Finally, prediction results calculated from the present model incorporating SK formula are in excellent agreement with the creep experimental data for PVC isothermally aged at relatively near to glass transition temperature.
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