含磷聚酯的合成及热稳定性研究

Preparation and thermal stability study of phosphorus-containing polyester

采用亚磷酸三苯酯和双酚A,分别以乙酸锂(LiAc)和氢氧化锂(LiOH)为催化剂,通过熔融缩聚法合成含磷聚酯。分别通过示差扫描量热仪(DSC)、热重分析仪(TG)和微型量热仪对制得的样品进行热稳定性测试。结果表明:反应3.5h,与LiAc作催化剂制得的含磷聚酯相比,LiOH作催化剂制得的样品具有更高的玻璃化温度达57.34℃;更好热稳定性,初始分解温度为263.1℃,700℃时失重率为26.52%;燃烧稳定性也更好,最大热释放速率为597.0W/g,对应温度为525.4℃。

Phosphorus-containing polyester was synthesized by bisphenol A and triphenyl phosphite through melt polycondensation by using LiAc and LiOH as catalysts.Thermal stability test of the resulting polyester was carried out by DSC,TGA and micro calorimeter,respectively.Compared with the product obtained by using LiAc as catalyst,resultant obtained catalyzed by LiOH showed higher Tg（57.34℃）,better thermal stability（with initial decomposition temperature263.1℃ and 700℃ carbon residue rate of 26.52%）,and better combustion stability with maximum heat release rate of597.0W/g（525.4℃）.