一、引言光致变色材料在国防、轻工、摄影等方面有重大的实用价值。对于不同类型光致变色原理的研究,既有理论意义,又有助于探求、扩大其应用范围。国外文献曾报导,无机杂多酸和某些高聚物形成固溶体,在光和(或)热的作用下发暗,当光、热辐射停止后,有的可恢复原来的颜色,但也有不可逆的。这类材料可用于制备控制光透过的阀门、防核辐射的肉眼保护镜,还可用于非银盐体系的摄影等。例如,把磷钼酸溶液倒入 I. Introduction Photochromic materials in the defense, light industry, photography and other aspects of great practical value. For different types of photochromic principle of research, both the theoretical significance, but also help to explore and expand its scope of application. Foreign literature has reported that inorganic heteropolyacid and some polymers form solid solution, the role of light and (or) heat, dark, when light and heat radiation stop, some can restore the original color, but there are also irreversible of. Such materials can be used to prepare the control of light through the valve, anti-radiation of the naked eye goggles, but also for non-silver salt system photography. For example, pour phosphomolybdic acid solution into