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聚合物的多重熔融行为是高分子科学中一个重要的研究内容。全同聚苯乙烯(isotactic polystyrene,iPS)具有结晶速率慢、结构稳定、晶型单一的特点,广泛地用于聚合物的基础研究工作。针对iPS的多重熔融现象,在过去的几十年中已经进行了大量的研究,对这种现象产生的机理提出过许多不同的解释,但目前还没有达成统一的认识。本文综述了iPS多重熔融的热力学特点,以及利用透射电子显微术(TEM)对其形态学研究的最新进展,回顾了熔融-重结晶模型、缺陷结晶模型和三相模型等几种多重熔融的理论模型。
The multi-melting behavior of polymers is an important research topic in polymer science. Isactic polystyrene (iPS) has the characteristics of slow crystallization rate, stable structure and single crystalline form, and is widely used in the basic research of polymer. Much research has been done on the phenomenon of multiple melting of iPS in the past few decades, and many different explanations have been given to the mechanism of this phenomenon. However, no unified understanding has been reached so far. In this paper, the thermodynamic characteristics of multi-melting iPS and its recent progress in the morphological study of transmission electron microscopy (TEM) are summarized. Several multimelt melts including melt-recrystallization, defect crystallization and three-phase Theoretical model