12-硅钨酸/PMMA复合薄膜的制备及光致变色性能

Preparation and Photochromic Properties of H_3SiW_(12)O_(40)/PMMA Composite Films

采用流延法制备了一系列不同配比的硅钨酸(H3SiW12O40)/聚甲基丙烯酸甲酯(PMMA)复合薄膜。用红外光谱(IR)和X射线衍射(XRD)对所制得的薄膜进行了表征。IR分析结果表明,所得复合薄膜材料中仍然保持着完好的Keggin结构,多酸H3SiW12O40与PMMA分子间以氢键的形式结合,并随着多酸含量的增加氢键逐渐加强;XRD分析表明,复合薄膜材料整体呈无定型态,并且复合材料短程有序的层间距离随多酸浓度的增加而减小。用UV光谱对复合薄膜光致变性能进行了研究,结果表明,杂多酸和PMMA之间发生了氧化还原反应并随多酸含量的增加,多酸与PMMA之间的作用增强。

A series of 12-silicotungstic acid（H3SiW12O40）/polymethyl methacrylate（PMMA） composite films with different ratio of mass fraction were prepared by the cast.The composite films were characterized by means of infrared（IR） spectroscopy and X-ray power diffraction（XRD）.The IR results show that the multi acid remains intact Keggin structure in the composite films,formed hydrogen bonds between H3SiW12O40 and PMMA molecules are gradually strengthen with the increase of acid content.The composite material shows amorphous state,and the layer′s distanc of short distance order in this compound materials is reduced as the increase of multi-acid concentrations through the XRD spectrum analysis.The redox reaction occurs in the 12-silicotungstic acid and PMMA,and the function enhances with the increase of the silicotungstic acid contents by UV spectrum.