常温激发热催化降解低密度聚乙烯膜  

Thermocatalytic Degradation of Low Density Polyethylene Films Through Room-temperature Stimulus

作　　者：张思钊 罗学刚[1,2] 丁凤[1,2] 林晓艳[1,2] 

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]西南科技大学生物质材料教育部工程研究中心,绵阳621010

出　　处：《武汉理工大学学报》2014年第4期48-52,共5页Journal of Wuhan University of Technology

基　　金：国家科技支撑计划(2007BAE42B04);西南科技大学研究生创新基金(13ycjj02)

摘　　要：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。By using low density polyethylene as the substrate of corresponding films and adding synthesized thermal catalyst, the polymeric degradable films were prepared using the blown method. The final films were characterized by means of SEM, AFM, GPC, and FT-IR. The experimental results show that the surfaces of polymeric films are truly destroyed via thermocatalytic reactions under ambient conditions after 60 days, the roughness values of film surfaces change from 3. 4 nm and 3. 7 nm at initial stage untreated to 78. 9 nm and 81.3 nm after the degradation, respectively. The changes of average molecular weights of the polymeric films have fallen dramatically comparing to the blanks. In addition, the changes of chemical groups of polymeric films were simultaneously monitored in the process, particularly, the occurrence of carbonyl absorption peak at 1 713 cm-1 was observed after undergoing the degradation. The evidence mentioned indicates a very fascinating route to come true the degradation of polymeric films with room temperature triggered, and the likely mechanism was also established.

关 键 词：热催化降解 低密度聚乙烯 膜 表面 机理 

分 类 号：TB324[一般工业技术—材料科学与工程]