「主動式智慧型節能窗戶」為對於太陽輻射之光與熱具有主動式控制能力的窗戶系統，其中一種技術為「利用聚合物分散型液晶製作可調整進光量之電控智慧型窗戶」，由於聚合物分散型液晶遮光態的機制為光散射，窗戶外的訊號無法完整傳遞至觀察者眼中，因此具隱私保護的遮蔽效果。藉由控制外加電場的大小，使用者可根據自身的需求及喜好，輕易的切換窗戶的透光率。然而太陽光中約有5%~8%為紫外光，紫外光不僅會對人體造成傷害，也會使有機高分子的材料產生劣化的情形，例如:黃化、粉化、龜裂…等。
本研究首先探討聚合物分散型液晶的形成原理，與了解製程參數(液晶盒厚度、聚合光強度、材料比例)形成的聚合物分散液晶之光電特性(透明態穿透度、散射態散射度、驅動電壓、反應時間)，接著研究液晶在紫外光照射前後的光電特性，如折射率異向性、驅動電壓、反應時間、吸收光譜以及相變點，藉由液晶劣化與聚合物分散型液晶劣化的特性做比對，推測出聚合物劣化導致的光電特性變化，討論了紫外光對不同形貌的PDLC所造成的影響，最後改善聚合物分散型液晶的紫外光耐受性的方法，於聚合物分散型液晶內添加紫外吸收劑，探討不同吸收劑濃度的PDLC製程參數，觀察聚合物分散型液晶對於紫外光的耐受性，以及弱紫外光與強紫外光的對應分析。

“Active Energy-saving Smart Window” is an active system that has ability to adjust the radiation of sunlight. One of those technologies is “using polymer dispersed liquid crystal (PDLC) to fabricate an electrical driving system of smart window which can regulate outdoor light.” Such a technology has a great effect on privacy protection because the mechanism of the dark state could scatter the incident light. By controlling applied voltage, users can depend on their requirement to switch the transmittance of light from outsides. However, there is about 5% to 8% ultraviolet light in the sunlight. The ultraviolet light not only harms the skin of human beings, but also causes the organic polymer’s degradation such as yellowing, cracking, chalking…etc.
In this work, we research the forming principle of PDLC at first and understand the electro-optical characteristics of PDLC in different parameters of manufacture. Next, to study the electro-optical characteristics of liquid crystal before and after UV irradiation such as refractive index anisotropic, threshold voltage, response time and optical transmittance. We surmise the influence of polymer’s degradation via compare the degradation of liquid crystal with PDLC. Then, we discuss the EO-characteristics of PDLC in different morphologies under the irradiation of UV light. At the end, we give a solution to improve the lifetime of PDLC in irradiation of UV light. Making use of doping UV absorber in PDLC, we study the parameters of manufacture and discuss the lifetime under the irradiation of UV light.

論文審定書 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 vii
表目錄 x
第一章 液晶介紹 1
1-1液晶起源 1
1-2液晶分類 1
1-2.1向列型液晶 2
1-2.2層列型液晶 3
1-2.3膽固醇型液晶 4
1-3液晶物理特性 5
1-3.1秩序性參數 6
1-3.2光學異向性 7
1-3.3介電異向性 8
1-3.4連續彈性體理論 9
第二章 相關知識與理論介紹 10
2-1智慧型窗戶介紹 10
2-1.1電致變色技術 10
2-1.2懸浮粒子技術 11
2-1.3熱致變色技術 11
2-1.4光致變色技術 12
2-1.4液晶技術(PDLC、PSCT) 12
2-2聚合物分散型液晶(PDLC) 12
2-2.1 PDLC的形成原理 14
2-2.2 PDLC的光學特性 14
2-2.3 PDLC的物理特性 15
2-3紫外光劣化簡介 16
2-3.1液晶的劣化 16
2-3.2聚合物的劣化 18
2-4添加劑介紹 19
2-4.1紫外光吸收劑 19
第三章 實驗方法與過程 20
3-1 PDLC實驗樣品製作 20
3-1.1材料介紹 20
3-1.2樣品製造流程 20
3-2 實驗架設 21
3-2.1紫外光源 22
3-2.2量測架設 22
3-3 PDLC光電特性調控參數 22
3-3.1參數一：液晶盒厚度 22
3-3.2參數二：聚合光強度 24
3-3.3參數三：聚合物與液晶比例 25
3-4 PDLC光電特性與溫度的關係 26
3-5 判定PDLC聚合完成的方法 28
第四章 實驗結果與討論 30
4-1 液晶劣化 31
4-1.1折射率異向性 31
4-1.2驅動電壓 32
4-1.3反應時間 33
4-1.4吸收光譜 34
4-1.5相變區間 35
4-2 PDLC劣化 36
4-2.1 MDA-PDLC劣化前後光電特性 36
4-2.2 PDLC劣化對反應時間的影響 37
4-2.3 不同形貌之E7-PDLC紫外光耐受性 38
4-2.4 E7-PDLC的相變區間 39
4-2.5 E7-PDLC與E7紫外光耐受性分析 42
4-3 PDLC參雜紫外吸收劑 40
4-3.1 聚合參數 40
4-3.2 參雜紫外吸收劑之PDLC紫外光耐受性 42
4-3.3 弱紫外光與強紫外光之對應 45
第五章 總結與未來展望 46
參考文獻 47

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