Towards shape-translational symmetry incommensurate polymer crystals
Towards shape-translational symmetry incommensurate polymer crystals
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DOI：
10.1016/j.polymer.2020.122407
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发表时间：
2020-05
期刊：
影响因子：
4.6
通讯作者：
Mark C. Staub;Christopher Y. Li
中科院分区：
文献类型：
--
作者：
Mark C. Staub;Christopher Y. Li
晶体最有趣的特征之一是它们的深刻形态。多面体或多边形形状常在单晶中观察到。聚合物晶体的分级结构和形态可以在晶胞、单晶和球晶长度尺度上描述。本文讨论了平移对称性在聚合物晶体形态从晶胞到单晶水平演化中的作用。我们将单晶水平的晶体结构分为两类：形状平移对称的公度晶体（SSC）和形状平移对称的非公度晶体（SSICs）。前一种情况包括经典的层状，树枝状单晶和外延驱动的晶体形态。在SSICs中，我们强调晶体的非平坦形状，这与欧几里得空间中的平移对称性不相称。经典的螺旋形，管状和涡卷晶体中讨论的SSICs。我们进一步强调了最近发现的球形晶体体，通过细乳液溶液结晶形成。本文综述了基于晶体形状和平移对称性之间相互作用的聚合物晶体形态，可用于研究和设计半结晶聚合物和共聚物的形态。
One of the most interesting characteristics of crystals is their profound morphology. Polyhedron or polygon shapes are often observed in single crystals. The hierarchical structure and morphology of polymer crystals can be described at unit cell, single crystal and spherulite length scales. This article discusses the role of translational symmetry in the evolution of polymer crystal morphology from unit cell to single crystal level. We divide single crystal level crystalline structure into two categories: shape-translational symmetry commensurate crystals (SSCs) and shape-translational symmetry incommensurate crystals (SSICs). The former case includes classical lamellae, dendritic single crystals and epitaxy-driven crystal morphologies. In SSICs, we emphasize crystals’ non-flat shapes, which are incommensurate with translational symmetry in Euclidean space. Classical helicoidal, tubular and scrolled crystals are discussed in the context of SSICs. We further highlight the recently discovered spherical crystalsomes which are formed via miniemulsion solution crystallization. This article provides an overview of polymer crystal morphology based on the interplay between crystal shape and translational symmetry, which may be used to study and design morphologies of semicrystalline polymers and copolymers.