不同厚度下聚乙烯微孔薄膜的光降解行为差异研究  

Study on the Differences in Photodegradation Behavior of Polyethylene Microporous Films with Different Thicknesses

作　　者：陈漫 汤诺伊玛 岳军衎 谈荞羽 李润莱 傅强[1] CHEN Man;TANG Nuo-yi-ma;YUE Jun-kan;TAN Qiao-yu;LI Run-lai;FU Qiang(College of Polymer Science&Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,成都610065

出　　处：《高分子通报》2025年第4期632-641,共10页Polymer Bulletin

基　　金：国家自然科学基金委重点项目(基金号52233002);青年基金(基金号52103042)。

摘　　要：本研究旨在探究具有不同厚度的聚乙烯微孔薄膜在光降解过程中性能的变化。通过傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、示差扫描量热法(DSC)及万能试验机等方法,详细分析了不同光照时间对膜材料的表面形貌、化学官能团、熔点、结晶度以及杨氏模量的影响。研究结果表明,在实验初期与末期,不同厚度的微孔膜在羰基指数的变化速率无显著差异;然而,在实验的第2~8天,厚度大于1μm与小于1μm的微孔膜在羰基指数的增加速率有轻微的差异。此外,力学性能方面,150 nm厚的聚乙烯微孔膜在光老化后的杨氏模量损失最为显著,光照6天后,杨氏模量降低了78.51%。聚乙烯微孔膜的光氧化反应受到内部孔径、纤维直径、结晶度及薄膜对光的吸收性能等因素的影响,在羰基指数相似的条件下,厚度小于1μm的微孔膜在光老化后的力学性能衰减更为严重。This study aims to investigate the changes in the properties of microporous polyethylene films with varying thicknesses during photodegradation.Fourier-transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),differential scanning calorimetry(DSC),and a universal testing machine were employed to analyze the effects of different exposure time on the surface morphology,chemical functional groups,melting point,crystallinity,and Young’s modulus of the films.The results showed that during the initial and final stages of the experiment,there was no significant difference in the rate of change of the carbonyl index between the microporous films of different thicknesses.However,from the 2nd to 8th day of the experiment,there was a slight difference in the rate of increase in the carbonyl index between microporous films thicker than 1μm and those thinner than 1μm.In terms of mechanical properties,the 150-nm thick polyethylene microporous film exhibited the most significant loss in Young’s modulus after photodegradation,with a 78.51%reduction after six days of exposure.The photodegradation of microporous polyethylene films is influenced by factors such as the internal pore size,fiber diameter,crystallinity,and the ability of the film to absorb light.Under similar carbonyl index conditions,the mechanical properties of microporous films with thicknesses less than 1μm degraded more severely after photodegradation.

关 键 词：聚乙烯 微孔膜 光降解 厚度 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]