废弃高分子材料的内应力消除及使用寿命预测  

Internal Stress Relieving of Polymer Waste Material and Its Service Life Prediction

作　　者：张玥[1] 吴驰飞[2] 余木火[1] 

机构地区：[1]东华大学材料学院,上海201620 [2]华东理工大学材料学院,上海200237

出　　处：《材料科学与工程学报》2014年第4期484-488,498,共6页Journal of Materials Science and Engineering

基　　金：教育部创新团队发展计划资助项目

摘　　要：为了减少废弃饮料瓶片（回收聚对苯二甲酸乙二酯,rPET）与瓶盖（回收线性低密度聚乙烯,rLLDPE）共混物的内应力,采用反应挤出法制备新型增容剂rLLDPE与甲基丙烯酸缩水甘油酯接枝乙烯-辛烯共聚物（POE-g-GMA）的接枝共聚物,通过溶剂沉浸法和热焓松弛拟合来观察和计算共混物的链段松弛时间,并利用动态力学性能预测材料的使用寿命。结果显示共混物在60℃下热处理25h以后,样条应力发白现象减弱,与热焓松弛拟合结果一致。120℃下热处理10h后的共混物在130~180℃时符合时温等效原理和WLF方程。根据共混物老化活化能的变化确定老化临界失效时间,利用寿命方程计算得到共混物在25℃下的使用寿命为9.6年。In order to relieve the internal stress in the blend of discarded beverage bottle （rPET） and bottle cap （rLLDPE）, new compatibilizer LLDPE-g-（POE-g-GMA） was prepared by reactive extrusion. The methods of solvent immersion and enthalpy relaxation fitting were used to practical test and theoretical calculate the segmental relaxation time. The solvent immersion test showed that the internal stress decreased significantly when the blend annealed at 60℃ for longer than 25h, which is in agreement with the result of enthalpy relaxation fitting. When the temperature was between 130-- 180℃, the behavior of the blend after annealed for 10 h at 120℃ obeys the Time-Temperature Superposition and well fits the WLF equation. The service life of the blend at 25℃ was estimated to be 9.6 years based on the annealing activation energy.

关 键 词：废弃高分子 内应力 热处理 热焓松弛 使用寿命 

分 类 号：TQ32[化学工程—合成树脂塑料工业]