以聚丙烯酸(PAA)接枝改性的纳米TiO2作为光催化助氧化剂,与低密度聚乙烯(LDPE)复合制备了一种可光氧化-生物降解的TiO2-g-PAA/LDPE复合薄膜.通过失重率、红外光谱、扫描电镜、高温凝胶渗透色谱等分析研究了该复合薄膜在空气中紫外光照下的光氧化性能,并对预氧化降解后的薄膜进行了微生物的降解实验.结果表明,PAA接枝改性可以提高TiO2在薄膜内部的亲水性及分散性,提高TiO2的光催化活性,有利于促进LDPE薄膜的光氧化-生物降解;扫描电镜结果显示,TiO2-g-PAA/LDPE复合薄膜光催化反应不但发生在薄膜的表面,而且能够发生在薄膜内部,使其结构整体降解,其降解效果要优于TiO2/LDPE薄膜.紫外光照415 h后,TiO2-g-PAA/LDPE复合薄膜的失重率达到39.13％,重均相对分子质量下降96.36％;而相同条件下纯LDPE薄膜的失重率只有0.15％,重均相对分子质量下降46.32％.预氧化后的薄膜碎片具有明显的生物降解性能.
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