Scholarlink

<p>Bisphenol-fluorene-type polycarbonate as a transparent thermoplastic resin, exhibits low birefringence due to the rigid fluorene. In this paper, a series of random co-polycarbonates (BPEF/BPA-PC) were prepared from bisphenol A(BPA), 9,9-bis[4-(2-hydroxyethoxy) phenyl] fluorene (BPEF) and diphenyl carbonate (DPC) using melt transesterification method by adjusting molar ratios of raw materials. The effects of catalyst dosage, polycondensation temperature and polycondensation time on the molecular weight of the products were systematically investigated, and the copolymer structures were characterized by FT-IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR spectra tests; the thermal performance were determined by Differential Scanning Calorimeter (DSC) and thermogravimetric analysis. The molecular weights and their distributions(<b>Đ</b>) were determined by Gel Permeation Chromatography. The results of GPC showed that the max M<sub>w</sub> of copolymers reached to 6.8*10<sup>4</sup>&#xa0;g/mol and Đ was 1.81. The maximal thermal decomposition temperature (<i>T</i><sub><i>d,5%</i></sub>) of the co-polycarbonate reached to 359.3&#xa0;°C. The refractive index of the materials was characterized using an Abbe refractometer and it showed refractive index (n<sub>d</sub>) up to 1.640 under visible light. Mechanical property tests showed that the tensile strength of co-polycarbonate were significantly increased when the contents of BPEF was higher, reflecting the enhancement effect of fluorene unit on the rigidity of molecular chain.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of composition and transesterification process on mechanical properties of BPEF/BPA co-polycarbonates

  • 期刊论文

  • 发表日期：

    2026年4月2日

查看全文
  • Jing Wang,
  • Wei Bai,
  • Gongying Wang,
  • Chen Li,
  • Qingyin Wang

摘要

Bisphenol-fluorene-type polycarbonate as a transparent thermoplastic resin, exhibits low birefringence due to the rigid fluorene. In this paper, a series of random co-polycarbonates (BPEF/BPA-PC) were prepared from bisphenol A(BPA), 9,9-bis[4-(2-hydroxyethoxy) phenyl] fluorene (BPEF) and diphenyl carbonate (DPC) using melt transesterification method by adjusting molar ratios of raw materials. The effects of catalyst dosage, polycondensation temperature and polycondensation time on the molecular weight of the products were systematically investigated, and the copolymer structures were characterized by FT-IR, 1H NMR and 13C NMR spectra tests; the thermal performance were determined by Differential Scanning Calorimeter (DSC) and thermogravimetric analysis. The molecular weights and their distributions(Đ) were determined by Gel Permeation Chromatography. The results of GPC showed that the max Mw of copolymers reached to 6.8*104 g/mol and Đ was 1.81. The maximal thermal decomposition temperature (Td,5%) of the co-polycarbonate reached to 359.3 °C. The refractive index of the materials was characterized using an Abbe refractometer and it showed refractive index (nd) up to 1.640 under visible light. Mechanical property tests showed that the tensile strength of co-polycarbonate were significantly increased when the contents of BPEF was higher, reflecting the enhancement effect of fluorene unit on the rigidity of molecular chain.