Na-MMT掺杂对PMA/PVP复合膜结构及光致变色性能的影响研究  

INFLUENCE OF Na-MMT-DOPED ON STRUCTURE AND PHOTOCHROMISM OF PMA/PVP NANOCOMPOSITE FILMS

作　　者：邹志明[1,2] 王春艳[1] 刘延[1] 冯威[1] 暴新建[1] 

机构地区：[1]大连海事大学环境科学与工程学院,大连116026 [2]三明学院化学与生物工程系,三明365004

出　　处：《高分子学报》2009年第12期1192-1197,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号40476046/D0608)资助项目

摘　　要：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.The phosphomolybdic acid/polyvinylpyrrolidone （PMA/PVP） nanocomposite films doped with sodiumbentonite （Na-MMT） were been prepared. The structure, thermal stability and photochromic behavior of these composite films were studied with TEM, AFM, FTIR, TG-DTA UV-Vis and XPS analysis. FTIR results showed the Keggin geometry of PMA and the structure of PVP were still preserved in the PMA/PVP composite films, and the salts were formed by combination of the ions based on the N atoms in the polymeric molecules and H＋ of the polyanions. The doping of Na-MMT had no influence on the effect of PVP and PMA, but enhanced the thermal stability. Irradiated with UV light, the composite film changed from colorless to blue, heteropolyacid had been deoxidized to heteropolybules. The doping of Na-MMT debased the photochromic response of PMA/PVP hybrid films owing to the exchange of ions between PMA and Na-MMT.

关 键 词：钠基膨润土 聚乙烯基吡咯烷酮 薄膜 光致变色 

分 类 号：O484.41[理学—固体物理]