化工进展2017，Vol.36Issue(3)：1003-1011,9.DOI:10.16085/j.issn.1000-6613.2017.03.032
结晶度对高密度聚乙烯光氧老化特性的影响
Influence of crystallinity on degradation properties of high density polyethylene by photo-oxidation aging
摘要
Abstract
In this article,the influence different degree of crystallinity on the mechanical properties, chemical structure,thermal stability,melting characteristic,average molecular weight and surface morphology evolution of HDPE after xeon photo-oxidation aging were studied by mechanics experiment,attenuated total reflection infrared spectroscopy(ATR-FTIR),thermogravimetry analysis (TGA),differential scanning calorimetry(DSC),gel permeation chromatography(GPC)and scanning electron microscope(SEM),respectively. The results show that higher degree of crystallinity in the HDPE results in a faster decrease in the bending strength,bending modulus and impact strength. The degree of unsaturation,carbonyl index and hydroxyl index increase significantly and the chain branching and chain breaking are more obviously and mainly concentrated in the early part of aging. The thermogravimetry analysis characteristic temperature decreases faster,but the melting peak temperature and the oxidation induction temperature decrease less significantly. The average molecular weight decreases more intensely and the aging degree of surface microstructure is more severe. The higher crystallinity the more the flaws in HDPE,which facilitates oxidation under thermo-oxidation environment and the aging phenomenon is more severe.关键词
结晶度/高密度聚乙烯/光氧老化/降解/氧化/色谱Key words
crystallinity/high density polyethylene/photo-oxidation aging/degradation/oxidation/chromatography分类
化学化工引用本文复制引用
代军,晏华,王雪梅,郭骏骏,桑练勇..结晶度对高密度聚乙烯光氧老化特性的影响[J].化工进展,2017,36(3):1003-1011,9.基金项目
国家科技支撑计划(2012BAF06B04)及重庆市研究生科研创新项目(CYS16239). （2012BAF06B04）
