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以低密度聚乙烯为膜材料基质,添加合成的热敏催化剂,吹膜制得高分子降解膜。在环境热刺激的响应下,用SEM、AFM、GPC和FT-IR对膜进行表征,研究了其热催化降解过程。结果表明,在环境条件下60d后,高分子膜表面确实被热催化反应所破坏,表面粗糙度分别由处理前的3.4nm与3.7nm变为降解后的78.9nm与81.3nm。与空白组对比,高分子膜的平均分子量出现了显著下降。此外,监测到高分子膜降解过程中化学基团的变化,特别是降解以后出现在1 713cm-1处的羰基吸收峰,并提出相应可能的降解机制。上述试验证据证明了一个颇具潜力的降解途径,通过常温激发来实现高分子膜降解。
Low-density polyethylene film material matrix, adding a synthetic heat-sensitive catalyst, blown film obtained polymer degradation film. The membrane was characterized by SEM, AFM, GPC and FT-IR in response to environmental thermal stimuli, and its thermocatalytic degradation process was studied. The results showed that the surface of the polymer film was indeed destroyed by the thermal catalysis after 60 days under the environmental conditions. The surface roughness changed from 3.4 nm and 3.7 nm to 78.9 nm and 81.3 nm after the degradation respectively. Compared with the blank group, the average molecular weight of the polymer film showed a significant decrease. In addition, the change of chemical groups during the degradation of polymer membrane was monitored, especially the carbonyl absorption peak at 1 713cm-1 after degradation, and the corresponding degradation mechanism was proposed. The experimental evidence to prove a potential pathways of degradation, through the excitation at room temperature to achieve polymer membrane degradation.