探索避开光线的环境:机械热合条件是垃圾填埋场塑料垃圾老化行为的原因
Qiujie Huang1, Changfu Yang1, Zhaowen Cheng2
1Shanghai Engineering Research Center of Solid Waste Treatment and Resource, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Water research
|June 12, 2023
概括
垃圾填埋条件加快了塑料的老化和微化. 高温和机械力会降解聚乙烯,增加产生微塑料的风险.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
背景情况:
- 垃圾填埋场的塑料面临着独特的,避免光衰老的老化条件.
- 垃圾填埋场中的塑料,特别是聚乙烯的老化过程尚不清楚.
研究的目的:
- 在模拟的垃圾填埋条件下研究聚乙烯塑料的老化行为.
- 确定高温和动态机械力对塑料老化的单独和联合影响.
主要方法:
- 在聚乙烯上模拟动态机械力和高温暴露.
- 降解产品和表面形态变化的分析.
主要成果:
- 高温驱动通过基 (·OH) 产生脱聚合和降解.
- 机械力量主要是导致表面结构的破坏.
- 结合的因素加快了老化,造成了表面损伤,促进了激进反应和微化,产生了14.25 ± 0.53μg L-1 微塑料.
- 老化塑料的脱聚合和氧化速度比原始塑料更快.
结论:
- 高温和机械力量协同加速聚乙烯老化和垃圾填埋场中的微化.
- 老化塑料由于其性能减弱,因此对微塑料产生更高的风险.
- 这项研究强调了解决垃圾填埋场中老化塑料废物的微塑料演变的关键需要.
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