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聚碳酸酯(PC)作为增长速度最快的通用工程塑料,其阻燃性难以满足日益增长的应用需求。通过熔融聚合将磷元素引入PC聚合物链中难以得到较高分子量的含磷PC。因此采用固相缩聚法,以碳酸二苯酯(DPC)、双酚A(BPA)、3-(羟基甲基磷酰基)-2-甲基-丙酸为原料合成得到了含磷PC,分别通过NMR、GPC、DSC和TG对所得含磷聚碳酸酯的结构、分子量和分子量分布、玻璃化温度、热稳定性等进行了测试和表征。结果表明:通过固相缩聚可以明显提高含磷PC的分子量、玻璃化温度和初始分解温度;经固相缩聚后,含磷PC的数均分子量由2950 g/mol提高到10 900 g/mol;玻璃化转变温度由86℃提高到133℃;初始分解温度由238.8℃提高到361.3℃。
Polycarbonate (PC) as the fastest growing general purpose engineering plastics, its flame retardancy difficult to meet the growing application requirements. It is difficult to obtain a higher molecular weight phosphorus-containing PC by introducing phosphorus into the PC polymer chain by melt polymerization. Therefore, solid-phase polycondensation was used to synthesize phosphorus-containing PC from diphenyl carbonate (DPC), bisphenol A (BPA) and 3- (hydroxymethylphosphoryl) -2-methyl- The structure, molecular weight and molecular weight distribution, glass transition temperature and thermal stability of the obtained phosphorus-containing polycarbonate were tested and characterized by NMR, GPC, DSC and TG. The results showed that the molecular weight, glass transition temperature and initial decomposition temperature of phosphorus - containing PC could be obviously increased by solid - state polycondensation. The number average molecular weight of phosphorus - containing PC increased from 2950 g / mol to 10 900 g / mol after solid - The glass transition temperature increased from 86 ℃ to 133 ℃; the initial decomposition temperature increased from 238.8 ℃ to 361.3 ℃.