聚对苯二甲酸丁二酯/聚对苯二甲酸乙二酯固态缩聚的研究

STUDY ON SOLID-STATE CONDENSATION POLYMERIZATION OF PBT/PET

研究了聚对苯二甲酸丁二酯(PBT)/聚对苯二甲酸乙二酯(PET)共混物的固态缩聚反应,从反应动力学过程的测定结果,表明与纯PET或PBT不同,其反应速度较快,并呈超加和的相对分子质量(以特性粘数[η]表征)增长。从反应发生在液相的基本观点出发,说明温度、共混等使液相增多,将加速反应的进行,加上共混物之间的相互缩聚和酯交换,生成嵌段共聚物的结果,导致超加和效应。

Solid-state condensation polymerization of PBT/PET blends are studied. The experimen tal results of reaction kinetics show that reaction rate of PBT/PET blends are quicker than that of the PBT or PET,and molecular weight (characterized by [η]) of reaction product of PBT/PET blends increase in ultra-addition. The ultra-additive effect has been discoursed by theory of solid-state condensation polymerization and ester interchange ,and it is show that ultra-additive effect is related to the increase of reaction rate and the formtion of block polymer.