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Dendromesogens: Liquid Crystal Organizations versus Starburst Structures

机译:树枝状致密晶:液晶组织与星爆结构

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摘要

The synthesis and the liquid crystalline behavior of a novel series of poly (amidoamine) (PAMAM)-dendrimer derivatives is described. The series consists of five new compounds that contain 4, 8, 16, 32, and 64 peripheral mesogenic ester units attached to the 0-, 1-, 2-, 3-, and 4-generation of poly (amidoamine) (PAMAM), respectively. These five compounds exhibit a smectic A mesophase, for which a structural model is proposed that is valid for several generations of dendrimers. This model is based on a structural characterization which mainly consists of X-ray diffraction studies. The molecules of these compounds exhibit a high degree of plasticity and tend to adopt the most convenient shape to afford liquid crystalline behavior. The mesogenic units form parallel aggregations that give rise to the smectic structure.
机译:描述了一系列新的聚(酰胺基胺)(PAMAM)-树状聚合物衍生物的合成和液晶行为。该系列由5个新化合物组成,这些化合物包含分别与0、1、2、3和4代聚(酰胺基胺)(PAMAM)相连的4、8、16、32和64个外围介晶酯单元, 分别。这五个化合物表现出近晶A中间相,为此提出了一种结构模型,该模型对几代树状聚合物有效。该模型基于主要由X射线衍射研究组成的结构特征。这些化合物的分子表现出高度可塑性,并且倾向于采用最方便的形状以提供液晶行为。介晶单元形成平行聚集,从而引起近晶结构。

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