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将钠基膨润土(Na-MMT)掺入磷钼酸/聚乙烯基吡咯烷酮(PMA/PVP)体系中,利用透射电子显微镜(TEM)、原子力显微镜(AFM)、红外光谱(FTIR)、热重-差热(TG-DTA)、紫外-可见吸收光谱(UV-Vis)、X射线光电子能谱(XPS)等手段对复合薄膜的结构、热稳定性和光致变色性能进行了研究.红外光谱结果表明keggin结构磷钼酸和聚乙烯吡咯烷酮的基本结构在复合膜中仍然存在,复合膜中高分子与质子结合,以阳离子的形式与杂多阴离子成盐.Na-MMT的掺杂未对复合膜中PVP和PMA间的相互作用产生影响,但其掺杂提高了复合膜的热稳定性.在紫外光照下,复合膜由无色变为蓝色,杂多酸被还原产生杂多蓝.Na-MMT的掺杂降低了复合膜的光致变色响应性,这是由于多酸分子与钠基膨润土之间发生阳离子交换作用导致的.
Sodium-bentonite (Na-MMT) was incorporated into the phosphomolybdic acid / polyvinylpyrrolidone (PMA / PVP) system and characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), infrared spectroscopy (FTIR) TG-DTA, UV-Vis and X-ray photoelectron spectroscopy (XPS) were used to study the structure, thermal stability and photochromic properties of the composite films.The results of FTIR keggin structure The basic structure of phosphomolybdic acid and polyvinylpyrrolidone still exists in the composite membrane, the composite membrane polymer and proton combined with cation form salt with heteropolyanion.Na-MMT doping did not composite membrane PVP And PMA, but its doping enhanced the thermal stability of the composite film.In UV light, the composite film from colorless to blue, heteropoly acid is reduced to produce heteropoly blue.Na-MMT Doping reduces the photochromic responsiveness of the composite film due to cation exchange between the polyacid molecule and sodium bentonite.