标题: 含碳六十表面改质之单/双苯酸之氢键弯曲型液晶混合物之 合成与研究
Synthesis and Study of Hydrogen-Bonded Bent Core Liquid Crystalline Mixtures Containing C60 Surface-Modified with Single and Double Benzoic Acid Surfactants
作者: 廖俊彦
Liao, Chun-Yen
林宏洲
Lin, Hong-Cheu
材料科学与工程学系所
关键字: 液晶;碳六十;弯曲状;混掺;氢键;Liquid Crystal;C60;bent core;mixture;H-bonding
公开日期: 2013
摘要: 以氢键之弯曲型液晶SiA-NBF14为主,本论文实验成功合成出两种含C60结构FIA与FIIA之混掺超分子液晶化合物,实验结果藉由1H-NMR、13C-NMR、红外线光谱仪、质谱以及元素分析鉴定其结构与纯度,并透过DSC、POM、电性量测以及XRD来探讨其液晶行为以及结构排列。研究结果显示藉由混掺不同浓度C60分子(客)的复合材料,可改变其不同的液晶特性,使液晶相的温宽提高,随着所添加的C60分子的增加,其铁电特性可由原本的反铁电性转为铁电性,且其在高混掺浓度下仍具有铁电液晶相。此外,实验结果显示透过微量的混掺含C60结构的FIA与FIIA可使此超分子液晶混合物的自发极化值(Ps值)与饱和电场达一最佳化值。
In this study we prepared novel composites materials from the hydrogen-bonded bent-core liquid crystal (LC) host and different mole ratios (0–90 mol%) of the surface-modified fullerenes(C60). The chemical structures of these compounds were characterized by 1H-NMR, 13C-NMR, IR spectra, MS as well as elemental analysis, and the liquid crystalline phases and mesomorphic behavior of all the compounds were identified from the results of DSC, POM, electro-optical measurement and XRD.
The mesomorphic properties of the composites, including their mesophasic types and ranges, values of Ps, and saturated electric field were adjustable by varying the doping concentrations of fullerenes. By increasing the concentration of fullerenes, the polarity of the SmCP phase in the composite varied sequentially from anti-ferroelectricity to ferroelectricity. Futhermore, adding a little amount of surface-modified fullerenes make the mixtures possesses the best Ps value and saturated electric field.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT070051539
http://hdl.handle.net/11536/72800
显示于类别:Thesis