9,9-bis(4-hydroxyphenyl)fluorene (BPF) is a highly structurally symmetric bisphenol with excellent optical properties of low birefringence and high refractive index, however, the glass transition temperature ( Tg) of its polyester is high ( Tg>300°C), which makes it difficult to be thermally processed and limits its application. On the other hand, 4,4′-Thiobis (2-methylphenol) (T2MP) has a flexible thioether group, its introduction not only brings high refractive index, but also can appropriately reduce the Tg of the polymer. Therefore, by combining the advantages of both of them, we prepared aromatic polyesters with high refractive index and stabilization. This study provides a route that can appropriately reduce Tg without loss of refractive index.

中文翻译：

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含芴和硫醚基团的高折射率芳香族聚酯的设计、合成及表征

9,9-双(4-羟基苯基)芴(BPF)是一种结构高度对称的双酚，具有低双折射和高折射率的优异光学性能，但其玻璃化转变温度( TG）其涤纶含量高（TG>300°C），这使得其难以热处理并限制了其应用。另一方面，4,4'-硫双(2-甲基苯酚)(T2MP)具有灵活的硫醚基团，它的引入不仅带来了高折射率，还可以适当降低TG聚合物的。因此，结合两者的优点，我们制备了具有高折射率和稳定性的芳香族聚酯。本研究提供了一条可以适当降低T的途径G且不损失折射率。