以4,4-二氨基二苯醚(ODA)、均苯四甲酸酐(PMDA)、硝酸锌和柠檬酸(CA)为原料,采用原位沉积法制备PI/ZnO复合薄膜,通过络合剂柠檬酸的加入改善纳米ZnO在聚酰亚胺(PI)表面的分散情况.利用X射线衍射仪(XRD)、扫面电子显微镜(SEM)、能谱(EDS)和红外(FTIR)等对样品的结构和形貌进行了表征.通过亚甲基蓝的降解率来评价复合薄膜的光催化活性.研究结果表明:添加络合剂可使ZnO颗粒更均匀地分散在PI薄膜中,掺杂柠檬酸的复合薄膜比不掺杂柠檬酸的复合薄膜具有更高的光催化活性.当柠檬酸与硝酸锌摩尔比为2 : 1,煅烧至350℃,并保温2h制得的复合薄膜对亚甲基蓝降解2h时降解率达97.7%.%Taking 4,4-two amino two phenyl ether(ODA)and pyromellitic dianhydride(PMDA),zinc nitrate and citric acid as raw materials,and by in-situ deposition method to prepare doped citric acid PI/ZnO composite films.The dispersion of nano ZnO on polyimide(PI)surface was improved by adding the chelating agent of citric acid.The properties were characterized by X-ray diffrac-tion(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS)and infrared spectroscopy(FTIR) .The photocatalytic activity of the composite films was evaluated by the degradation rate of methylene blue.The result shows that the addition of the chelating agent allows the ZnO particles to be more uniformly dispersed in the PI film,and the photocatalytic activity of PI/ZnO composite film doped with citric acid is greatly improved compared with PI/ZnO composite film without citric acid.When the citric acid and zinc nitrate molar ratio was 2 : 1,calcined to 350℃ for 2 hours,the degradation rate of methylene blue was 97.7%in 120 minutes.
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