将氯化铜加入到紫精/聚乙烯吡咯烷酮中,制得了一种可快速褪色、光疲劳性能优异的紫精/聚合物光致变色薄膜,测试了该薄膜的变色性能、褪色性能及光疲劳性能.结果表明,氯化铜的加入使薄膜初次紫外光照时的颜色变浅,但加快了薄膜褪色;当氯化铜与紫精摩尔比为1∶1、60 ℃褪色时,薄膜光照后在610 nm处吸光度的半衰期为9 min,而不含氯化铜的薄膜为54 min,氯化铜含量越高,半衰期越短.含有氯化铜的薄膜,随变色/褪色循环次数增加,光照后的显色加深,氯化铜含量越高,颜色增加的程度越大.该功能薄膜可用于信息存储、太阳镜及智能窗等方面.
Fast erasable photochromic films with well photofatigue property are prepared by blending of copper chloride into viologen/polyvinylpyrrolidone mixture. Photochromic performance, thermal fading and photofatigue properties of the films were studied. It has been found that with the addition of copper chloride there is color lost in the first UV irradiation, but the fading rate of the colored films are faster. The half life at 60 ℃ of the film, prepared by exposing to UV irradiation for 80 s and mole ratio of copper chloride to viologen 1:1, is abut 9 min, in comparing with 54 min for the film with no copper chloride. The higher mole ratio of copper chloride in the films, the faster the thermal erasing rate is. With increasing of coloring-discoloration cycle number, the photochromic color of the films become much deeper, and the more copper chloride in the films, the deeper the color is. These photochromic films can be used for information storage, sunglass and smart windows.
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