藍相液晶摻雜旋性聚合物之光電特性研究

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詹鈞証(Chun-Cheng Chan) 查詢紙本館藏

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照明與顯示科技研究所

論文名稱

藍相液晶摻雜旋性聚合物之光電特性研究
(Studies of the electro-optical properties of chiral polymer-doped blue phase liquid crystals)

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摘要(中)

近年來藍相液晶的光電特性受到國際間相當的重視，如藍相液晶的存在溫度範圍、藍相液晶對電壓的穩定性等，而大部分藍相液晶的存在溫寬都非常狹窄，尋求拓寬藍相液晶存在溫寬的方法因而顯得非常重要，目前最主要被應用於拓寬藍相液晶溫寬的方式為高分子聚合穩定藍相液晶，有別於利用高分子聚合物，本論文探討旋性聚合物在藍相液晶中的光電特性，並與一般高分子聚合物的效應做比較。
實驗結果顯示，旋性聚合物摻雜藍相液晶進行光聚合後可拓寬藍相液晶存在溫寬，為探討旋性聚合物拓寬藍相液晶存在溫寬的機制，本論文討論以下幾種不同變數的效應：(1)手性分子與手性聚合物摻雜濃度、(2)聚合物受光聚合時的相態、(3)聚合物受光聚合時間、(4)樣品厚度等。經由不同參數的改變，發現摻雜高濃度手性聚合物的樣品在均向態經紫外光照射進行聚合反應，可將藍相溫寬拓寬至30oC以上，根據文獻指出一般聚合物在均向態下進行光聚合反應以拓寬藍相溫寬的效果較差，因此摻雜旋性聚合物較一般聚合物可更有效且簡單地拓寬藍相溫寬。另外，此方式所得到藍相液晶的光電特性亦不亞於一般聚合物所拓寬的藍相液晶，也因少了聚合物在液晶盒內部之網絡結構的影響，故可提供更快速的反應速度。最後，我們提出其機制模型以說明本論文所發現的現象，相信此成果將對藍相液晶未來之技術發展有相當之助益。

摘要(英)

Recently, the electro-optical characteristics of blue phase liquid crystals (BP-LCs), such as the temperature range, stabilization as applying voltages, etc, have been paid much attention significantly. Moreover, the temperature range of BP-LCs is definitely narrow. It is clear that the extension of temperature range is one of the key points in BP-LCs field. Polymer-stabilized blue phase is the most commonly used method to extend the temperature range of BP-LCs. In this thesis, the electro-optical properties of chiral polymer-doped BP-LCs, as well as the comparisons between achiral and chiral polymers, are reported.
According to the experimental results, the polymerized chiral polymer onto the substrates can be used to extend the temperature range of BP-LCs significantly. To elucidate the mechanism for extending the temperature range of BP-LCs, several factors for the processes of photo-polymerization are considered. They includes (1) concentration of chiral dopant and chiral polymer; (2) LC phase (cholesteric, blue, and isotropic phases) during photo-polymerization; (3) curing duration; (4) cell gap, and others. It is demonstrated that the temperature range of BP-LCs can be extended to 30oC by polymerizing chiral polymer (6 wt%) polymerization in isotropic phase. Refer to some references; the extension of temperature range of BP-LCs via polymer stabilization can only be achieved by polymerizing achiral polymer in LC blue phase. Thus the proposed method (chiral polymer) is much easier than the conventional one (achiral polymer) to extend the temperature range of BP-LCs. Additionally, the electro-optical properties of chiral polymer-stabilized BP-LCs are as good as those of polymer-stabilized BP-LCs.

關鍵字(中)

★ 藍相液晶
★ 旋性聚合物

關鍵字(英)

★ blue phase
★ chiral polymer

論文目次

中文摘要 i
Abstract ii
誌謝 iii
目錄 iv
表目錄 viii
圖目錄 ix
第一章緒論 1
♦1.1 前言 1
♦1.2 動機 1
♦1.3 論文結構 2
第二章液晶簡介 4
♦2.1 液晶 4
2.1.1 何謂液晶 4
2.1.2 液晶的歷史 4
2.1.3 液晶的種類 5
2.1.4 液晶的物理特性 9
♦2.2 藍相液晶 16
2.2.1 何謂藍相液晶 16
2.2.2 藍相液晶的結構 17
2.2.3 藍相液晶的光電特性 19
2.2.4 藍相液晶的快速反應 23
第三章實驗相關理論 25
♦3.1 藍相液晶 25
3.1.1 藍相液晶的判別方式 25
3.1.2 藍相液晶寬溫技術 28
♦3.2 藍相液晶理論基礎 32
3.2.1 藍相液晶缺陷理論(Defect theory) 32
3.2.2 異相材料摻雜藍相液晶 33
♦3.3 高分子聚合物聚合方式 36
第四章實驗方法與過程 37
♦4.1 樣品製程 37
4.1.1 材料介紹 37
4.1.2 樣品製作 38
4.1.3 液晶盒厚度量測 40
♦4.2 實驗方法 42
4.2.1 偏光顯微鏡觀察樣品 42
4.2.2 溫控平台控制樣品溫度 43
♦4.3 實驗架構 43
4.3.1 藍相液晶溫寬量測 44
4.3.2 照射紫外光之高分子聚合過程 45
4.3.3 藍相液晶光電特性量測 46
第五章結果討論 48
♦5.1 藍相液晶存在溫度範圍 48
♦5.2 異相材料對藍相液晶的影響 51
5.2.1 旋性聚合物 (chiral polymer) 52
5.2.2 光啟始劑 (photo-initiator) 53
♦5.3 摻雜旋性聚合物樣品照射紫外光後之效應 53
5.3.1 照光時相態與藍相溫寬關係 54
5.3.2 照光時間與藍相溫寬關係 59
5.3.3 樣品厚度與藍相溫寬關係 63
♦5.4 藍相液晶之光電特性比較 64
5.4.1 藍相液晶穩定度 65
5.4.2 藍相液晶遲滯效應比較 66
5.4.3 藍相液晶反應時間比較 67
第六章結論與未來展望 70
♦6.1 結論 70
♦6.2 未來展望 71
參考文獻 73

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指導教授

鄭恪亭(Ko-Ting Cheng)

審核日期

2015-1-20

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