以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究
碩士 === 國立高雄師範大學 === 化學系 === 91 === Abstract In order to study the influence of the core structure on the phase behavior of the well-known antiferroelectric liquid crystals, (R)-MHPOBC , a series of homologoues containing pyridinyl ring was derived from (R)-2- octanol. New chira...
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ndltd-TW-091NKNU00650012016-06-22T04:20:21Z http://ndltd.ncl.edu.tw/handle/34312726352999058728 以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 黃光宇 碩士 國立高雄師範大學 化學系 91 Abstract In order to study the influence of the core structure on the phase behavior of the well-known antiferroelectric liquid crystals, (R)-MHPOBC , a series of homologoues containing pyridinyl ring was derived from (R)-2- octanol. New chiral liquid crystals 3a and 3b were synthesized by the esterification of 4-alkoxybiphenyl carboxylic acid 2a or 2b and the chiral phenolic compound 1. The liquid crystal phase sequence of the compound 3a is K─S?─SA─I. Therefore, it is not a ferroelectric liquid crystal. The liquid crystal phase sequence of the compound 3b is K─SCA*─S?─SC*─SA─I. It not only has the property of ferroelectricity but also antiferroelectricity. Our research results indicate that : (1) The length of the terminal achiral chain has a profound effect on the occurrence of SC*, SCA* and SCγ* phase. The reason is still not clear but the conformation change between 3a and 3b seems to be a plausible explaination. (2) The substitution of the phenyl ring of the (R)-MHPOBC structure by the pyridinyl ring does not interrupt the formation of SCA* phase. In comparison to (R)-MHPOBC chiral liquid crystal 3b has a lower phase transition temperature. (R)- MHPOBC 結構 (1): (2): (3): 蔡文亮 2002 學位論文 ; thesis 0 zh-TW |
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碩士 === 國立高雄師範大學 === 化學系 === 91 === Abstract
In order to study the influence of the core structure on the phase behavior of the well-known antiferroelectric liquid crystals, (R)-MHPOBC , a series of homologoues containing pyridinyl ring was derived from (R)-2- octanol. New chiral liquid crystals 3a and 3b were synthesized by the esterification of 4-alkoxybiphenyl carboxylic acid 2a or 2b and the chiral phenolic compound 1.
The liquid crystal phase sequence of the compound 3a is K─S?─SA─I. Therefore, it is not a ferroelectric liquid crystal. The liquid crystal phase sequence of the compound 3b is K─SCA*─S?─SC*─SA─I. It not only has
the property of ferroelectricity but also antiferroelectricity.
Our research results indicate that :
(1) The length of the terminal achiral chain has a profound effect on the occurrence of SC*, SCA* and SCγ* phase. The reason is still not clear but the conformation change between 3a and 3b seems to be a plausible explaination.
(2) The substitution of the phenyl ring of the (R)-MHPOBC structure by the pyridinyl ring does not interrupt the formation of SCA* phase. In comparison to (R)-MHPOBC chiral liquid crystal 3b has a lower phase transition temperature.
(R)- MHPOBC 結構
(1):
(2):
(3):
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蔡文亮 |
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蔡文亮 黃光宇 |
author |
黃光宇 |
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黃光宇 以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
author_sort |
黃光宇 |
title |
以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
title_short |
以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
title_full |
以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
title_fullStr |
以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
title_full_unstemmed |
以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
title_sort |
以6-羥基尼古丁酸為核部分子之掌性液晶合成及其液晶物性之研究 |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/34312726352999058728 |
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