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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Preparation and Characterization of Side-Chain Liquid-Crystalline Polyoxetanes Anchoring a Pendant Spacer-Separated Mesogen at the Tertiary-Like C-3 Carbon of the Oxetane Unit
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Preparation and Characterization of Side-Chain Liquid-Crystalline Polyoxetanes Anchoring a Pendant Spacer-Separated Mesogen at the Tertiary-Like C-3 Carbon of the Oxetane Unit

机译：氧杂环丁烷单元类似C-3碳的侧链悬垂分离的液晶元的侧链液晶多氧杂环丁烷的制备与表征

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摘要

Polyoxetanes anchoring a pendant spacer-separated mesogen at the tertiary-like C-3 carbon of the oxetane unit were prepared by cationic ring-opening polymerization of the corresponding oxetane derivatives. The resulting polymers were liquid-crystalline substances showing textures assignable to the nematic or smectic mesophase over a wide temperature range from about 260 ℃ to room temperature. These mesogens also behaved in the manner similar to that of the mesogens in the analogous polyoxetanes attached by a methyl side chain at the quaternary C-3 carbon, although the less bulky polymer backbone in the present work indicated a somewhat higher isotropic phase-transition temperature than that of the methyl-substituted analogs. In both types of the polyoxetanes, their mesophase patterns were influenced by the core structure and alkoxy tail length in the pendant mesogen, but not by the bulkiness of the second side chains, H and CH_3, attached at the C-3 carbon of the polyoxetane unit.
机译：通过将相应的氧杂环丁烷衍生物进行阳离子开环聚合反应，制得了在环氧乙烷单元的叔状C-3碳上锚定一个侧基分隔的液晶元的聚氧杂环丁烷。所得聚合物是液晶物质，其在约260℃至室温的宽温度范围内显示出可归属于向列或近晶中间相的织构。这些液晶元的行为也类似于在C-3季碳上通过甲基侧链连接的类似聚氧杂环丁烷中液晶元的行为，尽管本研究中较小的聚合物骨架表明各向同性相变温度更高比甲基取代的类似物。在两种类型的聚氧杂环丁烷中，它们的中间相模式均受悬挂的液晶元的核心结构和烷氧基尾长的影响，但不受聚氧杂环丁烷的C-3碳上连接的第二个侧链H和CH_3的庞大影响单元。

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