Study on the Property of Liquid-Crystalline Polyoxetanes Containing Ion-Conducting Domains Controllable for Driving the Pendant Mesogens

含可控离子导电域驱动悬垂介晶的液晶聚氧杂环丁烷性能研究

• 批准号: 15550117
• 负责人: MOTOI Masatoshi
• 金额: $ 1.41万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550117/
• 关键词: Liquid-crystalline polymers; Polyoxetanes; Polyoxiranes; Ring-opening polymerization; Ion-conductibility; Azobenzene; Mesogen-driving; Molecular design; 液晶性高分子

Thermotropic side-chain liquid-crystalline polyoxetanes containing a tri(oxyethylene) segment in the pendant spacer or tail were synthesized. The isotropic phase transition temperature (T_i) of the resultant polymers were remarkably lowered, e.g., T_i at 14.9 ℃ on cooling scan of differential scanning calorimetry (DSC) for a polymer with a -CH_2O(CH_2)_4O(CH_2CH_2O)_3-spacer and a methoxy tail, and showed a spherulitic texture by polarized optical microscopy (POM). When these polymers were mixed with LiClO_4 (an equimolar amount with respect to the oxyethylene unit), they showed DSC peaks, although the polymer with a methoxy tail only indicated a needle-like texture on heating and cooling scans, suggesting that the short tail did not hinder the mesophase formation, although the longer tails repulsed each other to hinder the mesophase formation, since width among mesogens was narrowed by formation of Li^+-oxyethylene complexes. Possibly the structure desired in this study was constructed, since the needle-like texture was ascribed to structural change in the mesophase domain. On the other hand, a polymer with a -O(CH_2CH_2O)_3-C_6H_4-p-F tail indicated no DSC peak and no POM texture above room temperature, and these results were not influenced by the presence and absence of LiClO_4. The polymer charged in a holder equipped with a voltage impression apparatus did not indicated any change in mesophase texture under impression of 1〜3V. This is ascribed to the fact that the polymer was so viscous that the polymer did not charged up to a full level of holder. A manuscript concerning the influence of the structural segments on the liquid-crystalline property was submitted to a Journal.

合成了在悬垂间隔段或尾部含有三氧乙烯段的热致侧链液晶聚氧烷。结果表明，聚合物的各向同性相变温度（T_i）明显降低，具有-CH_2O(CH_2) _40o (CH_2CH_2O)_3间隔层和甲氧基尾的聚合物在DSC（差示扫描量热法）冷却扫描时的T_i为14.9℃，极化光学显微镜（POM）下显示为球晶结构。当这些聚合物与LiClO_4（相对于氧乙烯单位等摩尔量）混合时，它们显示出DSC峰，尽管具有甲氧基尾的聚合物在加热和冷却扫描中仅显示出针状结构，这表明短尾没有阻碍中间相的形成，尽管长尾相互排斥阻碍中间相的形成，因为Li^+-氧乙烯配合物的形成缩小了中间相之间的宽度。由于针状结构归因于中间相域的结构变化，因此本研究中所需的结构可能已经构建。另一方面，具有-O(CH_2CH_2O)_3-C_6H_4-p-F尾部的聚合物在室温以上没有DSC峰和POM织构，并且这些结果不受LiClO_4存在与否的影响。在1 ~ 3V压印下，聚合物在装有压印装置的支架中充电，中间相织构没有变化。这归因于这样一个事实，即聚合物是如此的粘性，聚合物没有充电到一个完整的水平的持有人。一篇关于结构片段对液晶性能影响的论文被提交给了某期刊。