Affiliation:
1. National Engineering Research Center of Chiral Drugs Chengdu Organic Chemistry Co. LTD Chinese Academy of Sciences 610041 Chengdu Sichuan People's Republic of China
2. University of Chinese Academy of Sciences 100049 Beijing People's Republic of China
Abstract
AbstractCopolymer carbonate was synthesized from diphenyl carbonate (DPC), 9, 9‐bis [3‐phenyl‐4 ‐(2‐hydroxyethoxy) phenyl] fluorene (BPPEF) and 2,2′ ‐bis (2‐hydroxy‐ethoxy)‐1,1′ ‐binaphthalene (BHEBN) by melt transesterification. The composition and random structure of the copolymer were determined by FT‐IR, 1H NMR and 13C NMR analysis. DSC and TGA analysis showed that Cardo structure could significantly increase the glass transition temperature and thermal decomposition temperature. With the addition of BHEBN, the refractive index of copolymer was increased, but the thermal properties of copolymer were decreased. It is found that the contribution of naphthalene structure to the refractive index of the polymer material is higher than that of benzene structure. When the dosage of BHEBN is 42 mol %, the glass transition temperature (Tg) of the copolymer is 141.8 °C, the maximum thermal decomposition temperature is 421.9 °C, the refractive index is 1.6535, the Abbe number is 21, the transmittance is 88.29 %, and the birefringence is negative 0.01×10−3.
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