設計並合成非旋光性棒狀酯基化合物4-n-octyloxybiphenyl-4′-octyloxybenzoate ，此化合物類似4-octyloxyphenyl 4-octyloxybenzoate，預期能有像是旋光物質的特性。 n-4′-methoxybenzylidene-n-butylaniline(MBBA)也是一非旋光性棒狀分子，沒有構形上的旋光性。兩化合物分別添加於數種膽固醇型液晶混合且常溫下具有液晶相的膽固醇型液晶，發現摻有4-n-octyloxybiphenyl-4′-octyloxybenzoate的膽固醇型液晶其螺旋節距傾向變長。另一化合物MBBA加入膽固醇型液晶則傾向使螺旋節距變短，其特性猶如旋光性分子添加於膽固醇型液晶中一樣。

To design and synthesize achiral rod-like ester compounds, 4-n-octyloxybiphenyl-4′-octyloxybenzoate. The compound is similar to 4-octyloxyphenyl 4-octyloxybenzoate, which could provide expectantly with effects like chiral materials. n-4′-methoxybenzylidene-n-butyl aniline(MBBA) is also an achiral rod-like molecular, which is not chiral in terms of conformation. Two compounds were added in a mixture with several types of cholesteric liquid crystals that are in liquid crystal phase at room temperature, and it was found that the helical pitch of cholesteric crystal that were mixed with 4-n-octyloxybiphenyl-4′- octyloxybenzoate inclined to become longer. The other compound, MBBA, added in cholesteric liquid crystal have the inclination to make helical pitch shorter. The feature is the same as chiral molecular added in cholesteric liquid crystal.

摘要………...…………………………………………………………….I
Abstract……………………..………………………...…………………II
目錄…………………………………………………………..…………III
圖索引…………………………………………………...………….…..VI
表索引…………………………………………….…………………......X
第一章 緒論…………………………………………..……..…………1
1-1液晶的發現………………………………………...………………..1
1-2液晶的分類……………………...……………………...…………...3
1-3膽固醇型液晶之基本介紹……………………………...….………9
1-3-1膽固醇型液晶的分類………….………….………………...9
1-3-2膽固醇型液晶的光學組織與光學特性…..…..…………...11
1-3-3膽固醇型液晶的光學效應..………………………...……..15
1-3-4多成分膽固醇型液晶之混合特性………………..….……17
1-4研究動機與目的…………………………………………...………19
第2章 實驗方法……..……………………………………………….21
2-1實驗材料與設備…………………………..………...………….….21
2-1-1實驗材料…………………………………….……………..21
2-1-2實驗設備……………………………………...……………22
2-2合成流程與步驟…………………………………………………...24
2-3核磁共振…………………………………………………..……….26
2-4元素分析…………………………………………………..……….27
2-5質譜分析……………………………….……………….….……....28
2-6液晶摻混……………………………….……………….………….29
2-7偏光顯微鏡及紋理圖觀察法…………….………………….…….31
2-8 微差掃描卡計……………….……………….………..………….32
2-9液晶元件製作流程….………….…………….……………...…….33
2-10選擇性反射波長量測……..…….………….……...………….….33
第3章 結果與討論……………………………......………………….34
3-1 1H-NMR 光譜鑑定……………………….………………..….….34
3-2 元素分析………………………….……………………..…….….34
3-3 質譜儀分析…………………………………………...……….….35
3-4熱性質分析與光學紋理圖……………....………….………….….36
3-5選擇性反射波長之探討…………………………………...………53
第4章 結論………………………..………………………...…..……55
未來規劃…………………………..…………………….…………….56
參考文獻…………………………………………………….…….…..57
附圖………………………………………..…………………………..61










圖索引
圖1-1安息香酸膽固醇(Cholesteryl benzoate)之結構… ….………..1
圖1-2向列型液晶(a)分子排列示意圖(b)紋理圖………….…..……5
圖1-3膽固醇型液晶分子排列示意圖…………………..……..……8
圖1-4膽固醇液晶之光學紋理組織…………………….…….……11
圖 1-5膽固醇型液晶在planar texture下的布拉格反射圖….…….13
圖1-6 4-octyloxyphenyl 4-octyloxybenzoate之結構..…...………20
圖1-7 n-4′-methoxybenzylidene-n-butylaniline(MBBA)之結構….20
圖2-1合成4-n-octyloxybiphenyl-4′-octyloxybenzoate之流程圖.…24
圖2-2 4-n-octyloxybiphenyl-4′-octyloxybenzoate之結構……......25
圖2-3 cholesteryl oleyl carbonate(COC)之結構………….………29
圖2-4 cholesteryl nonanoate(CN)之結構…………………..….....29
圖2-5 cholesteryl benzoate(CB)之結構…………………...…..….30
圖2-6液晶摻混流程圖……………………………………...……...30
圖 2-7 POM量測系統裝置圖………………..………………….…32
圖3-1 COC、CN、CB以50:40:10比例摻混之DSC曲線...........…37
圖3-2 摻混0.25%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之DSC曲線圖........................................................................................37
圖3-3 摻混0.5%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之DSC曲線圖........................................................................................38
圖3-4摻混0.75%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之DSC曲線圖........................................................................................38
圖3-5 摻混1%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之DSC曲線圖................................................................................................39
圖3-6 摻混0.25%的MBBA之DSC曲線圖………………...…….39
圖3-7 摻混0.5%的MBBA之DSC曲線圖……….….…………....40
圖3-8 摻混0.75%的MBBA之DSC曲線圖……….…...………....40
圖3-9 摻混1%的MBBA之DSC曲線圖…………….…………....41
圖3-10 COC、CN、CB以50:40:10比例摻混之液晶相紋理圖…..43
圖3-11 摻混0.25%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之液晶相紋理圖…………….…………...…….……………………...44
圖3-12 摻混0.5%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之液晶相紋理圖………………….…………………………...…...…….44
圖3-13 摻混0.75%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之液晶相紋理圖…………………….………………........ ……….….45
圖3-14 摻混1%的4-n-octyloxybiphenyl-4′-octyloxybenzoate之液晶相紋理圖……………….…………………….……….…....…….45
圖3-15 摻混0.25%的MBBA之液晶相紋理圖…..…………….…46
圖3-16 摻混0.5%的MBBA之液晶相紋理圖…………..…….…..46
圖3-17 摻混0.75%的MBBA之液晶相紋理圖……………….…..47
圖3-18 摻混1%的MBBA之液晶相紋理圖………………..…......47
圖3-19 COC、CN、CB以50:40:10比例摻混並平行配向之液晶相紋理圖…………………….…………….………………..……....48
圖3-20 摻混0.25%的4-n-octyloxybiphenyl-4′-octyloxybenzoate並平行配向之液晶相紋理圖……………………………..…………..48
圖3-21 摻混0.5%的4-n-octyloxybiphenyl-4′-octyloxybenzoate並平行配向之液晶相紋理圖……………………………………..……..49
圖3-22 摻混0.75%的4-n-octyloxybiphenyl-4′-octyloxybenzoate並平行配向之液晶相紋理圖……………………………………..…..49
圖3-23 摻混1%的4-n-octyloxybiphenyl-4′-octyloxybenzoate並平行配向之液晶相紋理圖………………………………………...….50
圖3-24 摻混0.25%的MBBA並平行配向之液晶相紋理圖……...50
圖3-25 摻混0.5%的MBBA並平行配向之液晶相紋理圖…….....51
圖3-26 摻混0.75%的MBBA並平行配向之液晶相紋理圖…..….51
圖3-27 摻混1%的MBBA並平行配向之液晶相紋理圖…………52
圖3-28 添加不同濃度的4-n-octyloxybiphenyl-4′-octyloxybenzoate之反射率光譜圖…………………………………………………....54
圖3-29 添加不同濃度的MBBA之反射率光譜圖…………….….54









表索引
表1-1不同比例的膽固醇型液晶混合物之呈色範圍……………......18
表3-1合成之化合物所檢測出之元素分析結果……………………..35
表3-2合成之化合物所檢測出之質譜儀分析結果……………….….35
表3-3液晶主體添加不同濃度的4-n-octyloxybiphenyl-4′-octyloxybenzoate之相轉移溫度……………………………………………………42
表3-4 液晶主體添加不同濃度的MBBA之相轉移溫度……………42

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