【摘要】 <正> 高聚物等温结晶动力学方面的研究者甚多,由熔融缩聚制备的不同分子量PET的等温结晶动力学及几种不同缩聚催化体系固相缩聚PET的等温结晶动力学已有报道.本文采用一个修正的Avrami方程对固相缩聚PET样品进行系统的等温结晶动力学研究.更多还原

【Abstract】 The present paper covers the isothermal crystallization kinetics of PET with different mol. wt. that were got by solid state polycondensation. The experimental result shows that in the case of solid state polycondensation no matter whether the crystallization process begins from the melt state or from the glass state, the isothermal crystallization process in later stage can be described well by modified Avrami equation. t0 (the collision time of spherulites), t1/2 as well as the isothermal crystallization rate are discussed. Furthermore, the influences of mol. wt. of PET and temperature on the crystallization rate was also studied. The results also show that the crystallization rules of PET got from solid state polycondensation are basically the same as that of samples got from melt polycondensation.更多还原