科研之友
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摘要
The reaction of bisphenol A (BPA) with ethylene carbonate (EC) promoted by Bu2SnO at 180 degrees C 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 degrees C 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-transesterfication 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 degrees C is up to 17 6 x 10(3) The T-g of PC (M-n = 12 4 x 10(3)) is about 60 degrees C, which is much lower than that of the regular PC (T-g = 145 similar to 150 degrees C) The introduction of CH2CH2 unit into the main chain can reduce the T-g of PC and increase the crystallization ability The obtained PC has a good thermal stability
- 出版日期2010-11-20
- 单位河北工业大学
