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首页> 外文期刊>Chimie Nouvelle >Crystals and Crystallinity in Polymeric Materials
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Crystals and Crystallinity in Polymeric Materials

机译:聚合物材料中的晶体和结晶度

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摘要

A new view of the concepts of crystallinity and crystals in synthetic macromolecules is discussed.In polymeric materials crystallinity may be present with the concomitant occurrence of large amounts of structural disorder and in the absence of true three-dimensional long-range order.The structures of semicrystalline polymers are discussed in terms of idealized limit models of crystals,where long-range order may be achieved for structural features,which are not necessarily coincident with single atoms and are not necessarily point centered.This view explains the unusual ability of polymers to crystallize even in the presence of high degree of structural disorder.Polymer crystals characterized by long range order in the parallel arrangement of chain axes and large amount of structural disorder may be considered as solid mesophases.Lack of order in polymer crystals may arise from the presence of defects in the chemical constitution,configuration and conformation and defects in the mode of packing of chains inside the crystals.
机译:讨论了合成大分子中结晶度和晶体概念的新观点。在高分子材料中,可能会出现结晶度,同时伴有大量的结构混乱,并且没有真实的三维长程顺序。根据理想化的晶体极限模型讨论了半结晶聚合物,在该模型中可以实现结构特征的长距离顺序,这些特征不一定与单个原子重合,也不必点集中。这种观点解释了聚合物结晶的异常能力。即使在存在高度结构无序的情况下,也可以将以链轴平行排列的长程有序和大量结构无序为特征的聚合物晶体视为固态中间相。化学组成,构型和构象上的缺陷以及模式上的缺陷晶体内部的链堆积。

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