Synthesis and optical properties of co-polycarbonate containing Cardo structure and binaphthalene structure

In this paper, molten transesterification was used with diphenyl carbonate (DPC), 9,9'-bis[6-(2-hydroxyethoxy)naphthyl]fluorine (BNEF), 2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthalene (BHEBN) were used as the polymeric monomers to prepare a series of co-polycarbonates with different molar feeding ratios. It is found that when the molar ratio of BHEBN and BNEF is 6:4, the copolymer has more comprehensive properties. The Mn of the copolymer is 23000 Mn, the Mw is 40700, and the PDI is 1.77. The glass transition temperature is 147.6℃, the initial thermal decomposition temperature (T_d,5%) is 338.9℃, the refractive index is 1.6753, the Abbe number is 18.7, and the light transmittance is 86.23%.