Rigid-Rod Polyesters with Flexible Side Chains. 6. Appearance of Hexagonal Columnar Phase as a Consequence of Microsegregation of Aromatic Main Chains and Aliphatic Side Chains
Rigid-Rod Polyesters with Flexible Side Chains. 6. Appearance of Hexagonal Columnar Phase as a Consequence of Microsegregation of Aromatic Main Chains and Aliphatic Side Chains
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具有柔性侧链的刚性棒聚酯。
DOI：
10.1021/ma960342i
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发表时间：
1996
期刊：
影响因子：
5.5
通讯作者：
H. Kricheldorf
中科院分区：
文献类型：
--
作者：
J. Watanabe;N. Sekine;Tokihiro Nematsu;M. Sone;H. Kricheldorf
最近有几篇文献报道了具有长柔性烷基侧链的刚性棒状聚合物的热致相行为。1-13这些材料最有趣的特性是当烷基侧链达到临界长度时，它们在晶体和液晶中形成层状结构的能力。R-螺旋聚（L-谷氨酸γ-烷基酯）是这类材料的第一个例子，1最近，还研究了具有长烷基侧链的芳香族聚酯和聚酰胺。2-13层状中间相的特征在于刚性杆主链横向堆积成层，流体状侧链占据层之间的空间。据推测，采用这种结构的驱动力是一种类型的脂肪族和芳香族域的微相分离。在这些层状结构中，液晶性是相对于层内的主链堆积和层之间的流体状无序烷基侧链部分或完全缺乏位置顺序的结果。12在具有层状结构的结晶相中，从X射线和NMR分析发现，主链和侧链以协同方式结晶。十，十二，十三
There have been several recent reports in the literature on the thermotropic phase behaviors of rigid-rod polymers with long flexible alkyl side chains. 1-13 The most interesting property of these materials is their ability to form layered structures in crystals and liquid crystals when the alkyl side chains reach a critical length. The R-helical poly (γ-alkyl L-glutamates) were the first examples of this type of material, 1 and recently, aromatic polyesters and polyamides with long alkyl side chains have also been examined. 2-13 The layered mesophases are characterized by a lateral packing of the rigid-rod main chains into layers, with the fluidlike side chains occupying the space between the layers. It has been postulated that the driving force for the adoption of such a structure is a type of microphase separation of the aliphatic and aromatic domains. 2, 5, 6, 12 In these layered structures, liquid crystallinity is the result of a partial or total lack of positional order with respect to the main-chain packing within a layer and the fluidlike disordered alkyl side chains between the layers. 12 In the crystalline phases with a layered structure, it has been found from X-ray and NMR analyses that the main chains and side chains crystallize in a cooperative fashion. 10, 12, 13