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熔融结晶或凝胶(溶液)结晶聚乙烯(PE)的固态拉伸已成为生产高模量高强度纤维的方法。在此,本文讨论了另一种基于熔融加工的生产方法,并评价了这种方法的优点。与估计的不同,柔性链聚合物不需要固态下的后拉伸,可通过熔融加工直接生产具有良好力学性能的取向制品。熔融加工的聚乙烯产生一特殊的微原纤维复合材料形态,使之具有很好的力学性能。本文还通过将这些微原纤维复合材料与传统的纤维复合材料和分子复合材料的对比,对复合材料设计进行了综述。
Solid state stretching of molten crystalline or gel (solution) crystalline polyethylene (PE) has become a method of producing high modulus high strength fibers. Here, we discuss another production method based on melt processing and evaluate the advantages of this method. In contrast to the estimation, the flexible chain polymer does not require post-stretching in the solid state and the oriented article with good mechanical properties can be directly produced by melt processing. The melt-processed polyethylene produces a special micro-fibril composite morphology that gives it good mechanical properties. The article also reviews composite designs by comparing these microfibrillar composites with traditional fiber composites and molecular composites.