Abstract Many polymers show polymorphous behavior that they can crystallize into different crystalline modifications under different circumstances. For a particular polymer material, in most of the cases, one of the several possible modifications is generally preferentially developed. Therefore, selective control of the specific polymorphous modification thus properties in polymeric materials is highly desired. This article discusses underlying mechanism of polymorph selection during crystallization of random copolymers. Following a general discussion of theoretical considerations, we present case studies of butene-1/ethylene and propylene/ethylene random copolymers. Our results indicate that polymorph selection during crystallization of random copolymers is primarily controlled by the nucleation process. Nucleation of different polymorphs can be easily tuned via creating differently structured melt.

中文翻译：

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无规共聚物结晶过程中的多晶型选择

摘要 许多聚合物表现出多晶行为，在不同的环境下可以结晶成不同的晶型。对于特定的聚合物材料，在大多数情况下，通常会优先开发几种可能的修改之一。因此，非常需要选择性控制特定的多晶型改性从而聚合物材料的性能。本文讨论了无规共聚物结晶过程中多晶型选择的基本机制。在对理论考虑进行一般性讨论之后，我们介绍了 1-丁烯/乙烯和丙烯/乙烯无规共聚物的案例研究。我们的结果表明，无规共聚物结晶过程中的多晶型选择主要受成核过程控制。