高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (12): 3765.doi: 10.7503/cjcu20210382

• 高分子化学 • 上一篇    下一篇

含双酚芴聚碳酸酯的合成与光学性能

杜欣瑶, 王玮, 林宇, 吴国章()   

  1. 华东理工大学材料科学与工程学院, 上海市先进聚合物重点实验室, 上海 200237
  • 收稿日期:2021-06-05 出版日期:2021-12-10 发布日期:2021-09-13
  • 通讯作者: 吴国章 E-mail:wgz@ecust.edu.cn

Synthesis and Optical Properties of Polycarbonates Copolymerized with Bisphenol Fluorene Moiety

DU Xinyao, WANG Wei, LIN Yu, WU Guozhang()   

  1. Shanghai Key laboratory of Advanced Polymeric Materials,School of Materials Science and Engineering,East China University of Science & Technology,Shanghai 200237,China
  • Received:2021-06-05 Online:2021-12-10 Published:2021-09-13
  • Contact: WU Guozhang E-mail:wgz@ecust.edu.cn

摘要:

将具有负双折射系数的双酚芴{9,9-二[4-(2-羟乙氧基)苯基]芴, BPEF}与双酚A(BPA)共聚, 制备本征双折射率接近零的含双酚芴聚碳酸酯(共聚PC). 研究发现, 碱性强、 pKa值大的催化剂可以缩小BPA和BPEF的活性差异, 有利于制备高分子量含双酚芴聚碳酸酯, 缩聚温度为265 ℃、 缩聚时间为40 min时产物具有较高的分子量和较低的黄变指数. BPEF和BPA投料比(摩尔比)为40/60时共聚体系的重均分子量可达39800, 1H NMR和13C NMR测试证明分子链呈无规共聚结构. 随着BPEF含量的上升, 共聚PC的折射率从1.586提高到1.639, 本征双折射率从0.1948下降到-0.0102. 当BPEF摩尔分数为87%时, 共聚PC的本征双折射率低至0.0028, 非常接近零双折射.

关键词: 聚碳酸酯, 共聚改性, 光学材料, 分子量

Abstract:

To reduce the birefringence of bisphenol A polycarbonate(BPA-PC), we intended to copolymerize bisphenol fluorene(BPEF) with BPA to prepare a copolycarbonate with intrinsic birefringence close to 0. We observed that catalysts with a large basic pKa value can reduce the difference in reactive activity between BPA and BPEF, thus increasing the molecular weight of copolycarbonates. When the polycondensation temperature is 265 ℃ and time is 40 min, the weight-average molecular weight of the synthesized PC with a feed molar ratio of BPEF/BPA of 40/60 reaches 39800. 1H NMR and 13C NMR analysis testify that all products are random copolymers. Increasing the content of BPEF leads to a high refractive index and a low birefringence value. When the BPEF molar fraction is 87%, the intrinsic birefringence is approximately 0.0028, which is very close to zero birefringence.

Key words: Polycarbonate, Copolymerization modification, Optical material, Molecular weight

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