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用解偏振光法研究了 PET,PBT以及 PET-PBT,PBT-PBI共聚物在不同条件下的等温结晶过程 .结果表明 ,Avrami指数 n值和结晶速度常数随条件不同呈明显规律变化 ,且 n值在绝大多数情况下不成整数 .由此提出了这样的假设 :n值是一个与晶核中结晶生长点数目相关的参数 .
The isothermal crystallization process of PET, PBT, PET-PBT and PBT-PBI copolymer under different conditions was studied by using the depolarization method.The results showed that the Avrami index n and the crystallization rate constant changed obviously with different conditions and n The value is not an integer in the vast majority of cases, thus making the assumption that n is a parameter related to the number of crystal growth points in the nuclei.