Synthesis and hygrothermal aging of polycarbonates containing a bisphenol fluorene moiety.

2a , for the BNE/BPEF system, the T g of the copolymer PC showed a decreasing trend with an increase in BNE content, mainly due to the introduction of the binaphthyl structure of BNE, where the two naphthalene rings positioned adjacently form a non-coplanar conformation due to their large volume, disrupting interchain packing and thus lowering the T g value of the polymer. 25 The refractive index of the BPEF homopolymer PC was 1.639, and the refractive index of the copolymer PC increased with the increase in BNE content, reaching 1.661 when the BNE molar content was 80%, meeting the requirements for high refractive index.

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