光降解剂体系对降解薄膜光降解行为的影响

Effect of Controlled Time Photosensitizer Systems on Degradation of Photo Biodegradable PE Films

研究了含有不同光降解剂体系的光－生物降解聚乙烯（ＰＥ）膜在氙灯辐照下诱导期、脆化时间、分子量及力学性能等的变化规律。结果表明：它们都具有明显的时控光降解效应，复合光敏剂能使薄膜的诱导期、脆化时间在较大的范围内变动；光敏剂浓度的改变能有效地影响脆化时间的长短；聚乙烯薄膜的脆化分子量一般为４０００—６０００左右。

Induction period, embrittlement time, molecular weight and tensile strength of photo biodegradable PE film which contain various photo sensitizer systems are studied. The results indicate that every photo sensitizer system has obvious time controlled effect and the concentration of photo sensitizer could change embrittlement time more efficiently compared to induction period. The molecular weight is about 4000-6000 when PE film is brittle.