改性TiO_2光催化降解LDPE薄膜的研究  

Study on the Photocatalytic Degradation of LDPE Film by Modified TiO_2

作　　者：宋霜霜[1] 邝淑明 杨薇[1] 陈创行 董先明[1] 罗颖[1] 

机构地区：[1]华南农业大学理学院应用化学系/生物材料研究所,广东广州510642

出　　处：《塑料工业》2014年第2期34-38,共5页China Plastics Industry

基　　金：国家自然科学基金项目(51003034);广东省科技计划项目(2010B080701072);华南农业大学"211工程"三期重点建设项目(2009B010100001)

摘　　要：以纳米TiO2作为光催化剂,将丙烯酸(AA)接枝到其表面,制备了可降解的LDPE/TiO2-g-PAA复合薄膜,在空气中进行紫外加速老化试验,利用红外光谱(FTIR)、紫外可见光谱(UV-vis)、扫描电镜(SEM)、示差扫描量热仪(DSC)和万能试验机分别对光照前后LDPE及复合薄膜进行分析表征。结果表明,TiO2-g-PAA在复合薄膜中具有较好的亲水性,明显提高了纳米TiO2在LDPE复合薄膜中的光催化活性,光照415 h后LDPE/TiO2-g-PAA复合薄膜的结晶度为26.33%,比纯LDPE薄膜的19.18%明显增大。A degradable composite film was prepared by embedding the hydrophilic acrylic acid grafted nanoTiO2 into the LDPE （LDPE/TiO2-g-PAA）.Solid-phase photocatalytic degradation of the LDPE/TiO2-g-PAA composite film was carried out in ambient air under ultraviolet irradiation.The properties of composite films were compared with those of the pure LDPE films and the LDPE/TiO2 composite films through performing FT-IR spectroscopy,UV-vis spectroscopy,SEM analysis,DSC analysis and universal testing machine.The results showed that PAA grafted onto TiO2 significantly improved the photocatalytic activity of nano-TiO2 in LDPE films owing to its better hydrophilicity in the composite film.The crystallinity of LDPE/TiO2-g-PAA composite film was 26.33% after 415 hours UV-irradiation,and it was significantly higher than that of pure LDPE films which was only 19.18%.

关 键 词：纳米二氧化钛 丙烯酸接枝改性 聚乙烯复合薄膜 光催化降解 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]