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研究生：	沈宜 Shen, Yi
論文名稱：	高分子穩定化溶致型膽固醇液晶彈性體的製備及應力感測研究 Synthesis and Characterization of Polymer Stabilized Lyotropic Cholesteric Liquid Crystal Elastomers Using as Stress Sensors
指導教授：	劉瑞祥 Liu, Jui-Hsiang
學位類別：	碩士 Master
系所名稱：	工學院 - 化學工程學系 Department of Chemical Engineering
論文出版年：	2021
畢業學年度：	109
語文別：	英文
論文頁數：	73
中文關鍵詞：	可調結構色、液向型膽固醇液晶、液晶水膠彈性體、布拉格反射、壓力感測器
外文關鍵詞：	Tunable structural color, Lyotropic cholesteric liquid crystal, Liquid crystal elastomer, Bragg’s reflection, Stress sensor
相關次數：	點閱：202 下載：0
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自然界中富含結構色，生物會隨著外界刺激改變呈色結構，此研究以液向型膽固醇液晶彈性體模擬生物結構色變化。膽固醇液晶是具有特殊螺旋結構的一維光子晶體，遵守布拉格反射。本實驗由具有手性的高分子羥丙基纖維素(HPC)以適當濃度溶解在溶劑中，經由自組裝形成液向型膽固醇液晶以反射入射光，並以紫外光-可見光光譜儀確認。調整手性分子羥丙基纖維素的含量，可以反射不同波段的光。
膽固醇液晶水膠可隨著外部機械刺激與溫度變化顯現顏色變化，例如伸長、壓縮和彎曲。這種現象歸因於螺旋距上的可逆變化所導致。透過光聚合高分子網狀結構(PNIPAM、PAM)穩定液晶結構色。高分子穩定的液向型膽固醇液晶水膠可承受更重的壓力變化且不易在試驗中產生缺陷。
最後，為了提升液晶水膠的回彈性，我們將液晶水膠以聚二甲基矽氧烷(PDMS)包覆，利用聚二甲基矽氧烷的高彈性，大幅縮短了回復時間並增加液晶水膠的可重複使用性。透過實驗設計會隨著外在刺激具有顏色調節能力的液晶彈性體，未來可以用在壓力感測器上，透過直接的視覺觀測應力變化，並可加入導電材料將其轉為電訊號。

Nature is rich in structural colors, and organisms change their color structure with external stimuli. In this study, a series of lyotropic cholesteric liquid crystal elastomers was used to simulate the color variation of biological systems. Cholesterol liquid crystal is a one-dimensional photonic crystal with a unique helical structure exhibits Bragg's reflection. The chiral polymer hydroxypropyl cellulose (HPC) was dissolved in a solvent at an appropriate concentration, and the cholesteric phase was formed by self-assembly. Adjusting the content of chiral HPC reflects the incident light in different wavelengths. The reflected light was confirmed and analyzed using an ultraviolet-visible spectrophotometer.
Cholesterol liquid crystal hydrogel exhibits color variation by external stimulation such as, elongation, compression, bending, and temperature variations. This phenomenon is caused by the reversible change of the helix pitch. To stabilize the color construction, polymer network of PNIPAM and PAM was introduced. The synthesized polymer stabilized liquid crystal hydrogels show significant pressure resistance and decrease the formation of defects during the mechanical test.
Finally, to improve the reliability of the liquid crystal hydrogel, the fabricated polymer stabilized hydrogels were encapsulated with polydimethyl- siloxane (PDMS). Encapsulation via the high elasticity polydimethylsiloxane greatly shortens the recovery time and increases the reliability of the lyotropic hydrogels. Based on the results, the predesigned polymer stabilized liquid crystal hydrogels showing color tunable ability are available candidates for using as stress sensors detected by visible color variations through the eyes.

Abstract　　I
中文摘要　　II
誌謝　　III
Contents　　IV
List of Tables　　VII
List of Figures　　VIII
1.	Introduction　　1
1-1 Preface　　1
1-2 Research Motivation　　2
2.	Literature Review　　3
2-1 Introduction of Liquid Crystals　　3
2-2 Classification of Liquid Crystals　　5
2-2-1 Thermotropic Liquid Crystals　　6
2-2-2 Lyotropic Liquid Crystal　　12
2-3 Physical properties of Liquid Crystals　　13
2-3-1 Anisotropic Properties of Liquid Crystals　　13
2-3-2 Birefringence of Liquid Crystals　　14
2-3-3 Dielectric Properties of Liquid Crystals　　15
2-4 Introduction of Structural Colors　　16
2-4-1 Structural Colors Based on Photonic Crystals　　17
2-4-2 Tunable Structural Colors　　18
2-4-3 Structure Colors Based on Lyotropic Liquid Crystals　　21
2-5 Introduction of Cellulose　　22
2-5-1 Supramolecular Chemistry　　23
2-5-2 Self-Assembly of Cellulose and Water　　23
2-5-3 Cellulose-Based Liquid Crystal　　25
2-6 Introduction of hydrogels　　27
2-6-1 Application of Hydrogel-Based Sensor　　28
2-7 Introduction of Photonic Crystal Hydrogels　　29
2-7-1 Pressure Sensitive Photonic Crystal Hydrogel　　30
2-7-2 Liquid Crystal Hydrogel Actuators　　31
2-7-3 Wearable Photonic LCG Skin　　32
3.	Experimental Section　　34
3-1 Materials　　34
3-2 Instruments　　35
3-3 Experimental　　36
3-3-1 Fabrication of Liquid Crystal Hydrogels (LCGs)　　36
3-3-2 Dynamic Mechanical Analysis of LCGs　　38
3-3-3 Morphology Observation of LCGs　　39
3-3-4 Dielectric properties of LCGs　　39
3-3-5 Design and Fabrication of LCG Films　　40
4.	Results and Discussion　　42
4-1 Characterization of the Fabricated Lyotropic LCs　　42
4-1-1 Optical Properties of Lyotropic LCs　　42
4-1-2	Dielectric Properties of Lyotropic LCs　　45
4-2 Fabrication of LCGs　　48
4-3 Characterization of the Synthesized LCGs　　49
4-3-1 Structure Identification　　49
4-3-2 Mechanical Properties of LCGs　　50
4-3-3 Thermal Properties of the Synthesized LCGs　　55
4-3-4 Morphology of the Synthesized LCGs　　57
4-4 Color Variation LCG Elastomers　　58
4-4-1 Thermal Responsive Color Variations　　58
4-4-2 Stress Induced Color Variation　　59
4-4-3 Stability of LCGs　　63
Conclusions　　66
References　　67
                                    

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2026-07-01公開

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