中国塑料2024，Vol.38Issue(8)：100-105,6.DOI:10.19491/j.issn.1001-9278.2024.08.016
填埋场废弃聚苯乙烯老化机制研究
Study on aging mechanism of waste polystyrene in landfill
朱晨曦 1陈辰慧 1胡国明 1张蕾 2江伟1
作者信息
- 1. 南京大学环境学院,污染控制与资源化研究国家重点实验室,国家有机毒物污染控制与资源化工程技术研究中心,南京 210023
- 2. 云南师范大学化学化工学院,昆明 650500
- 折叠
摘要
Abstract
This study simulated the photo-thermal aging of discarded polystyrene(PS)in a landfill environment.Firstly,the molecular structure of the aged samples was characterized.The aging process of PS was then studied through X-ray diffraction,differential scanning calorimeter tests,and the tool-narayanaswamy-moynihan(TNM)model,along with molecular dynamics calculations of enthalpy relaxation processes.The results indicated that PS undergoes chain scission after photoaging,with the molecular weight decreasing from 112 200 to around 13 000.This process generates PS oligo-mers,benzoic anhydride,acetophenone,and methyl benzoate.Furthermore,aging leads to a reduction in PS crystallini-ty and the glass transition temperature.The enthalpy relaxation changes rapidly in the early stages of aging,gradually slowing down as aging progresses,with a corresponding enthalpy value of 4.2 J/g at equilibrium.关键词
填埋场/废弃聚苯乙烯/老化行为/性能变化/理论计算Key words
landfill/waste polystyrene/aging behavior/performance change/theoretical calculation分类
化学化工引用本文复制引用
朱晨曦,陈辰慧,胡国明,张蕾,江伟..填埋场废弃聚苯乙烯老化机制研究[J].中国塑料,2024,38(8):100-105,6.
