结晶态双酚A型聚碳酸酯固相缩聚的研究

Study on Solid State Polycondensation of Crystalline Bisphenol—A Polycarbonate

在自制的反应器中将结晶态、无定形两种双酚A型聚碳酸酯(BAPC)预聚体固相缩聚合成了高摩尔质量的双酚A型聚碳酸酯。采用DSC、IR对双酚A型聚碳酸酯(BAPC)的熔融行为和结构进行了表征。结果表明,BAPC在固相缩聚后,玻璃化转变温度升高,热稳定性增强,其中BAPC为结晶态时固相缩聚的温度低于无定形态BAPC的固相缩聚温度,且结晶态BAPC固相缩聚后为无定形态。

High molecular weight bisphenol--A polycarbonate （BAPC） was respectively synthesized by solid state polyeondensation with crystalline and amorphous bisphenol--A polycarbonate prepolymer in a solid phase reactor. The bisphenol--A polycarbonate was characterized by DSC and FTIR spectroscopy. The resuits showed that bisphenol--A polycarbonate glass transition temperatures increased after solid state polycon-densation, while its thermal stability enhanced. In addition, the polycondensation temperature of crystalline prepoymer was lower than that of amorphous. The polyeondensation synthesized by crystalline bisphenol--A polycarbonate was amorphous.