结晶聚合物一般常同时含有非晶态与晶态部分,晶态部分有时还同时含有两种或两种以上的晶态。这些结构组分的特性以及它们之间的关系和相对含量对聚合物的物理机械性能有着非常重要的影响。如聚丙烯未拉伸纤维在不同的纺丝条件下可以生成非晶态与α晶态(单钭晶系)、或非晶态与急冷晶态(Smetic)、或非晶态与α晶态和急冷晶态共存的结构。α晶态较稳定,表现出较高的强度,而急冷晶态则较不稳定和较易形 Crystalline polymers generally contain both amorphous and crystalline portions, sometimes in combination with two or more crystalline phases. The properties of these structural components as well as their relationship and relative content have a very important influence on the physical and mechanical properties of the polymer. Such as polypropylene unstretched fibers under different spinning conditions can generate amorphous and α crystalline (monoclinic system), or amorphous and quenched crystalline (Smetic), or amorphous and α crystalline And quench the coexistence of crystalline structure. α crystalline is more stable, showing higher strength, while the quenched crystalline state is less stable and more easily shaped