Transparent, photochromic, and X-ray shielding polymer films were obtained by bulk radical copolymerization of bismuth(III) methacrylate (BiMA), easily synthesized from Ph₃Bi and methacrylic acid, and N,N-dimethylacrylamide (DMAA). The refractive indices and X-ray shielding abilities were increased as the increase of the bismuth content. The photochromism, coloring by UV irradiation and discoloring under ambient conditions, occurs by reversible redox between the bismuth carboxylate structure and Bi(0). The facile preparation procedure using inexpensive substances is an advantage over those of previously reported bismuth-containing polymers.

中文翻译：

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甲基丙烯酸铋（III）共聚制备透明光致变色材料

透明、光致变色和 X 射线屏蔽聚合物薄膜是通过本体自由基共聚甲基丙烯酸铋 (III) (BiMA) 获得的，BiMA 很容易由 Ph ₃ Bi 和甲基丙烯酸合成，与N , N -二甲基丙烯酰胺 (DMAA)合成。折射率和X射线屏蔽能力随着铋含量的增加而增加。光致变色，通过紫外线照射着色并在环境条件下变色，通过羧酸铋结构和 Bi(0) 之间的可逆氧化还原发生。使用廉价物质的简便制备方法优于先前报道的含铋聚合物。