Abstract

New photochromic compositions are obtained on the basis of hyperbranched oligoglycerol covalently bound to a methyl methacrylate–maleic anhydride copolymer. The irradiation of such compositions with UV light leads to reversible photoinduced transformations between the cyclic spiropyran and open merocyanic forms of photochromic spiropyran. The kinetics of dark relaxation of the photoinduced merocyanine form to the initial state of the compound incorporated into the given polymer matrix is studied. It is shown that branched compounds with a relatively low molecular weight are efficient for preparing photochromic polymers with a high rate of dark relaxation. It is found that the time of dark relaxation of the polymer composition with a high molecular weight oligoglycerol introduced into the polymer matrix increases sharply.

中文翻译：

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超支化低聚甘油和光致变色成分的基础

摘要

在与甲基丙烯酸甲酯-马来酸酐共聚物共价结合的超支化低聚甘油的基础上，获得了新的光致变色组合物。用紫外光照射这种组合物导致在环状螺吡喃和光致变色螺吡喃的开环亚甲基形式之间的可逆的光诱导转变。研究了光诱导的花菁形式从暗态松弛到加入到给定聚合物基质中的化合物的初始状态的动力学。结果表明，具有较低分子量的支链化合物对于制备具有高暗弛豫速率的光致变色聚合物是有效的。发现将高分子量的低聚甘油引入到聚合物基质中的聚合物组合物的黑暗松弛时间急剧增加。