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《Polymeric Materials Science & Engineering》 2005-03
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EFFECTS OF TEMPERATURE AND STRESS LEVEL ON THE FREE VOLUME IN HIGH POLYMERS

LUO Wen-bo~(1,2), YANG Ting-qing~3, WANG Xia-yu~1 (1.College of Chemistry, Xiangtan University; 2.Institute of Fundomental Mechanics & Material Engineering, Xiangtan Universty, Xiangtan 411105, China; 3.Department of Mechanics, Huazhong Universiy of Science and Technology, Wuhan 430074, China)  
Time dependence of mechanical behavior of viscoelastic materials, such as high polymers, reveals the assumption of an intrinsic time o′clock, which can be influenced by many factors such as temperature, physical aging, pressure, solvent concentration, damage, strain and stress levels, etc. The changes in intrinsic time of viscoelastic materials are usually studied in the framework of the free volume theory. In this paper, the dependence of intrinsic time of viscoelastic materials on the combination of applied stress level and temperature was investigated. The correlation between material viscosity or free volume and its two influencing factors (i.e. temperature and stress level) was derived. Based on the free volume theory and the obtained formulae, the time-temperature-stress equivalence principle was preliminarily proposed.
【Fund】: 国家自然科学基金资助项目(10172037;20204012);; 湖南省教育厅青年项目(02B005)
【CateGory Index】: O631.21
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