聚乙烯的自然和模拟气候变化:聚合物接口的分子视图
T Borgmeyer1, L Zhou2, F Breider3
1École Polytechnique Fédérale de Lausanne (EPFL), ENAC IIE GR-LUD, Station 2, CH-1015 Lausanne, Switzerland.
气候变化显著改变了聚钢表面,增加了表面功能组 (SFG) 和反应性. 紫外线辐射导致了最多的表面-OH功能化,而臭氧处理会使接口酸化.
科学领域:
- 聚合物科学 聚合物科学
- 表面化学 表面化学
- 材料科学 材料科学 材料科学
背景情况:
- 了解聚合物表面变化对于预测材料性能和相互作用至关重要.
- 聚乙烯 (PS) 是一种广泛使用的聚合物,其表面特性可能会因环境因素而改变.
研究的目的:
- 在各种气候处理后研究聚烯表面功能群 (SFG) 的分子水平变化.
- 量化臭氧暴露,紫外线辐射和自然水浸的表面功能化的程度和类型.
主要方法:
- 聚乙烯颗粒受到三个气候条件的影响:臭氧气体暴露 (PSO3),紫外线辐射 (PSSS) 和浸入淡水湖 (PSL).
- 使用定位技术探测和量化聚合物接口的化学成分,重点关注SFG.
- 用减弱总反射里埃变换红外光谱 (ATR-FTIR) 来进行比较,尽管它对表面变化的敏感性有限.
主要成果:
- 气候变化显著增加了PS的平均表面功能化,从原始材料的20% (PSV) 到UV处理样品的84% (PSSS).
- 表面基 (-OH) 组是主要的SFG,从PSV的11.2%增加到PSSS的64%.
- 臭氧处理导致接口酸化,每个气候变化方法都产生了特有的SFG"指纹".
结论:
- 该研究表明,气候变化极大地改变了聚钢接口,增加了SFG的丰富性和反应性.
- 紫外线辐射是提高聚钢表面-OH功能的最有效的气候变化方法.
- SFG的积累增强了聚合物接口对探头气体吸附的反应性.
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