论文部分内容阅读
为了获得较高分子量的具有高阻燃性的热致性液晶高分子,通过固态聚合方法合成了一种基于对羟基苯甲酸、对苯二甲酸、乙二醇和含磷菲环取代二酚的高热稳定性、较低相转变温度和宽的液晶相转变温度范围的含磷液晶共聚酯(BDQTEP),并对该含磷液晶共聚酯预聚物(pre-BDQTE)在不同固态聚合条件下获得的聚合物热性能和液晶性进行了研究.对其固态反应速率控制进行了初步的探讨,当反应温度为235℃时,固态聚合反应较为理想.在聚合的初始阶段,共聚酯特性黏数[η]、黏流温度Tf和羧基浓度[COOH]均随聚合时间而明显变化,但在6h后变化较小,几乎不变.通过固态后缩聚,将熔融聚合获得的特性黏数[η]=0.44dL/g的含磷液晶共聚酯BDQTE的特性黏数提高了近两倍.
In order to obtain high-molecular-weight thermotropic liquid crystal polymer with high flame retardancy, a high heat based on p-hydroxybenzoic acid, terephthalic acid, ethylene glycol and phosphorus-substituted phenanthrene was synthesized by solid state polymerization Stability, low phase transition temperature and wide liquid crystal phase transition temperature range of phosphorus-containing liquid crystal copolyester (BDQTEP), and the phosphorus-containing liquid crystal copolyester prepolymer (pre-BDQTE) under different solid state polymerization conditions The thermal properties and the liquid crystallinity of the obtained polymer were studied.The solid state reaction rate control was preliminarily discussed.When the reaction temperature was 235 ℃, the solid state polymerization was ideal.In the initial stage of polymerization, the intrinsic viscosity The values of [η], Tf and carboxyl concentration [COOH] both changed obviously with the polymerization time but little changed after 6h, and the intrinsic viscosity [η ] = 0.44dL / g of phosphorus-containing liquid crystal copolyester BDQTE intrinsic viscosity increased nearly tripled.