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。 The solid state polycondensation reaction of polybutylene terephthalate (PBT) / polyethylene terephthalate (PET) blends was studied. The results from the reaction kinetics showed that, unlike pure PET or PBT, The reaction is fast and increases with the relative molecular mass of superaddition (characterized by intrinsic viscosity [η]). From the basic viewpoint that the reaction takes place in the liquid phase, the results of accelerating the progress of the reaction by increasing the liquid phase such as temperature, blending and the like, together with mutual polycondensation and transesterification of the blend, to produce a block copolymer, Leading to superadditive effect.