磷钨酸/PLA光降解薄膜的制备及性能  

Preparation and Performance of Phosphotungstic Acid/PLA Photodegradable Film

作　　者：徐莉 丁艳红 王建闯 卢文静 包沙日勒敖都 王保营 XU Li;DING Yanhong;WANG Jianchuang;LU Wenjing;BAO Sharileaodu;WANG Baoying(Henan University of Animal H usbandry and Economy,Zhengzhou,He'nan 450046,China;Tongliao Market Inspection and Testing Center,Tongliao,Inner Mongolia 028000,China)

机构地区：[1]河南牧业经济学院,河南郑州450046 [2]通辽市市场检验检测中心,内蒙古通辽028000

出　　处：《塑料》2024年第6期49-53,61,共6页Plastics

基　　金：河南省重点研发与推广专项(科技攻关)项目(232102321039,232102110133);河南牧业经济学院博士科研启动基金(2020HNUAHEDF023);河南省大学生创新创业训练计划(202310469006)。

摘　　要：为解决聚乳酸(PLA)薄膜降解周期不可控的问题,以聚乳酸为成膜基材、磷钨酸为光催化剂,采用流延法制备了磷钨酸含量分别为0.1、0.2、0.3、0.4 g的磷钨酸/PLA光降解薄膜。实验结果表明,磷钨酸/PLA复合膜的热稳定性随磷钨酸含量的增加而增大,纯PLA膜的热分解温度为285.54℃,当磷钨酸的含量为0.1 g时,复合薄膜的最大热分解温度升高至371.61℃;随着磷钨酸含量的增加,磷钨酸/PLA光降解薄膜的降解速率加快,当磷钨酸的含量为0.3 g时,薄膜的降解速率达到最大,在太阳光下照射31 h后,薄膜的失重率达到22.3%;SEM测试结果表明,当磷钨酸的含量为0.1、0.2、0.3 g时,磷钨酸在PLA薄膜内分布均匀,薄膜致密;当磷钨酸的含量大于0.4 g时,磷钨酸在薄膜中出现团聚。通过添加自由基捕获剂可知,磷钨酸/PVA复合膜光降解过程中,·O^(-)_(2)为光催化活性中心。To solve the problem of uncontrollable degradation cycle of polylactic acid(PLA)films,prepraed phosphotungstic acid/PLA composite photodegradable films with polylactic acid as substrate and phosphotungstic acid as photocatalyst by tape casting method.In which,phosphotungstic acid content was 0.1,0.2,0.3 and 0.4 g,respectively.The experimental results showed that the thermal stability of the phosphotungstic acid/PLA composite film increased with the increase of phosphotungstic acid content.The thermal decomposition temperature of the pure PLA film was 285.54℃.When the content of phosphotungstic acid was 0.1 g,the maximum thermal decomposition temperature of the composite film increased to 371.61℃;As the content of phosphotungstic acid increased,the degradation rate of phosphotungstic acid/PLA photocatalytic films accelerated.When the content of phosphotungstic acid increased to 0.3 g,the degradation rate was the highest,the weight loss rate reached 22.3%after 31 h of exposure to sunlight;SEM testing results showed that when the content of phosphotungstic acid was 0.1,0.2 and 0.3 g,phosphotungstic acid was evenly distributed in the PLA film and the film was dense;When the content of phosphotungstic acid was greater than 0.4 g,phosphotungstic acid aggregated in the film.By added free radical scavengers,it was shown that·O^(-)_(2)was the photocatalytic active center in the photodegradation process of phosphotungstic acid/PLA composite film.

关 键 词：磷钨酸 聚乳酸 热稳定性 光降解 机制 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]