A NONPHOSGENE PROCESS FOR BISPHENOLA POLYCARBONATE WITH ETHYLENE UNITS AND CHARACTERIZATION OF THE POLYMER

XUN  Hong-Di; WANG  Xiao-Mei; WANG  Jia-Xi

doi:10.3724/SP.J.1105.2010.09410

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A NONPHOSGENE PROCESS FOR BISPHENOLA POLYCARBONATE WITH ETHYLENE UNITS AND CHARACTERIZATION OF THE POLYMER

Research Article | 更新时间：2021-03-19

- A NONPHOSGENE PROCESS FOR BISPHENOLA POLYCARBONATE WITH ETHYLENE UNITS AND CHARACTERIZATION OF THE POLYMER
- Acta Polymerica Sinica Issue 11, Pages: 1276-1282(2010)
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- DOI：10.3724/SP.J.1105.2010.09410
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- Published：20 November 2010，
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XUN Hong-Di, WANG Xiao-Mei, WANG Jia-Xi. A NONPHOSGENE PROCESS FOR BISPHENOLA POLYCARBONATE WITH ETHYLENE UNITS AND CHARACTERIZATION OF THE POLYMER. [J]. Acta Polymerica Sinica (11):1276-1282(2010)
DOI：

XUN Hong-Di, WANG Xiao-Mei, WANG Jia-Xi. A NONPHOSGENE PROCESS FOR BISPHENOLA POLYCARBONATE WITH ETHYLENE UNITS AND CHARACTERIZATION OF THE POLYMER. [J]. Acta Polymerica Sinica (11):1276-1282(2010) DOI： 10.3724/SP.J.1105.2010.09410.

摘要

以双酚A（BPA），碳酸乙二酯（EC）和碳酸二甲酯（DMC）为原料，制备双酚A二元醇（Ⅰ）和双酚A碳酸酯（Ⅱ），并用红外光谱与核磁共振波谱对其结构进行表征.通过Ⅰ与Ⅱ的共缩聚反应及Ⅱ的自聚实现了主链中含有CH2CH2单元的双酚A型聚碳酸酯（PC）的非光气法合成，用凝胶渗透色谱法（GPC）和TGADSC对PC的分子量和热性质进行分析.结果表明，Ⅱ在240℃自聚6 h后产物的Mn可达17.6103，主链中CH2CH2单元的引入，可以降低聚合物的Tg，提高其结晶性，所得聚合物具有良好的热稳定性.

Abstract

The reaction of bisphenol A (BPA) with ethylene carbonate (EC) promoted by Bu2SnO at 180℃ produces dihydroxyethylbisphenol A (Ⅰ) along with the liberation of CO2.The influence of temperature on the reaction of EC and BPA is investigated by FTIR.The diol Ⅰ reacted with dimethyl carbonate (DMC) at 120℃ to generate bisphenol A carbonate (Ⅱ) in yield of 96%.Their structures were characterized by FTIR and NMR.A novel nonphosgene process for producing bisphenolA polycarbonate (PC) was developed through the self transesterification of Ⅱ and cotransesterification of Ⅰ and Ⅱ.The self transesterification of Ⅱ is much faster than cotransesterification of Ⅰ and Ⅱ. The reaction temperature strongly affects the molecular weight of polycarbonate.NMR

gel permeation chromatography (GPC)

differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to measure the molecular structure and thermodynamic properties.The average number molecular weight of PC obtained from the selfpolymerization of Ⅱ for 6 h at 240℃ is up to 17.6103 .The Tg of PC (Mn = 12.4103) is about 60℃

which is much lower than that of the regular PC (Tg = 145~150℃).The introduction of CH2CH2 unit into the main chain can reduce the Tg of PC and increase the crystallization ability.The obtained PC has a good thermal stability.

关键词

非光气合成双酚A碳酸二甲酯碳酸乙二酯聚碳酸酯

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