Highly refractive and X-ray shielding polymer films were prepared by bulk radical copolymerization of diphenylstyrylbismuthine (MStBi) with tristyrylbismuthine (TStBi). For example, a yellow transparent film was obtained by copolymerization of MStBi and TStBi in a ratio of 70:30 (w/w). The refractive index (n_D) and radiopacity of the film of these polymers are 1.72 and 1.60 μm-Al/μm-polymer, respectively. These properties are higher than those of the reported bismuth-containing polymers. The thermal stability and flexural module of the polymer films were controllable by the feed ratio of TStBi. The polymer films also exhibited high surface hardness and solvent resistance due to the rigid and cross-linked structure. The chemical and thermal stability and higher refractive index and radiopacity of the polymers suggest the potential applications for X-ray shielding of optical materials with high refractive indices.

中文翻译：

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苯乙烯基铋衍生物自由基聚合合成具有高折射率和X射线屏蔽性能的含铋聚合物薄膜

通过二苯基苯乙烯基铋（MStBi）与三苯乙烯基铋（TStBi）的本体自由基共聚制备高折射和X射线屏蔽聚合物薄膜。例如，通过MStBi和TStBi以70:30 (w/w)的比例共聚得到黄色透明薄膜。折射率（n _D) 和这些聚合物薄膜的射线不透性分别为 1.72 和 1.60 μm-Al/μm-聚合物。这些性能高于已报道的含铋聚合物。聚合物薄膜的热稳定性和弯曲模量可通过 TStBi 的进料比控制。由于刚性和交联结构，聚合物薄膜还表现出高表面硬度和耐溶剂性。聚合物的化学和热稳定性以及更高的折射率和射线不透性表明具有高折射率的光学材料的 X 射线屏蔽的潜在应用。