系統識別號 U0026-0212201216095600
論文名稱(中文) 聚乙烯基咔唑薄膜式液晶元件之特性:配向效應、熱反應、相位分離及其新穎應用
論文名稱(英文) Properties of Poly(N-vinylcarbazole) Film-Based Liquid Crystal Devices: Alignment Effects, Thermal Behaviors, Phase Separation, and Novel Applications
校院名稱 成功大學
系所名稱(中) 光電科學與工程學系
系所名稱(英) Department of Photonics
學年度 101
學期 1
出版年 101
研究生(中文) 陳園迪
研究生(英文) Yuan-Di Chen
電子信箱 o66850@gmail.com
學號 l78981131
學位類別 博士
語文別 英文
論文頁數 165頁
口試委員 指導教授-傅永貴
中文關鍵字 液晶  聚乙烯基咔唑  偶氮染料  微布朗運動  相分離  光致分子同分異構反應  光偏振轉變器  光閥 
英文關鍵字 liquid crystals  poly(N-vinylcarbazole)  azo dye  micro-Brownian motion  phase separation  photoisomerization  polarization converter  light shutter 
中文摘要 高分子聚乙烯基咔唑薄膜式液晶元件上具有許多複雜但有趣的特性,包括了摩擦配向引致液晶導軸排向與高分子主鏈垂直、熱致高分子鏈形變或是相分離等等。本研究主要著重於這些特性並用於製備各式液晶元件。
英文摘要 Polymer-poly(N-vinylcarbazole) (PVK) film-based liquid crystal (LC) devices have complex, but interesting properties, which include rubbing induced the LC alignment being perpendicular to the main chain of the polymer, thermal-induced deformation of polymer chains, phase separation, and so on. This study mainly focuses on these properties and their uses for fabricating LC devices.
First, three radial LC devices have been developed according to the property of the rubbing direction being perpendicular to the LC director on a PVK film. Notably, the fabrication of these devices is easy, fast, and inexpensive. More importantly it is suitable for large-scale device fabrication. The performances of the devices have been examined in detail. The results indicate the radially aligned devices have high thermal stability, and exhibit no optical loss in the visible range. In addition, we can change the LC alignment by applying a voltage. Thus, the devices can be used to modulate the strength and polarization profile of a laser beam electrically.
Our investigations indicate LCs aligned by a PVK film can be switched thermally. The selected LC determines the onset temperature required to switch the LC alignment. The cause of the switching is due to the thermally-induced micro-Brownian motion of the side chains of the polymer. Such a micro-Brownian motion of the side chains causes the reduction of the spontaneous polarization along the side chains, which aligns LC molecules. Finally, LCs align parallel to the polymer main-chain (rubbing direction) after being cooled to the room temperature. Because the required thermal energy of a LC with a higher clearing temperature (Tc) is higher than that with a lower Tc, we can choose the proper LCs to improve the thermal stability of the device. Based on these properties, we establish a thermal gradient to fabricate linear and concentric polarization rotators. The properties of both the polarization rotators have been examined in detail. The experimental results agree well with the simulated ones confirming that the LC alignment of the polarization rotators present a continual twist.
Our investigations also verify that the PVK can be dissolved in an isotropic LC. Because of the specific process involved, we name such a method as a particular thermally induced phase separation (TIPS). The fabricated sample presents highly scattering and can be switched to the transparent state by applying a voltage. Thus, the device can be used as an electrically controllable LC light shutter, which possesses numerous good features, such as low driving voltage, fast response, independent of polarization, and high contrast ratio (~300:1). Finally, based on the surface morphologies of these substrates, we find that the cause of the scattering state is due to the rough surface inducing random alignments of the LCs.
Finally, we find that the azo dye doped in a LC cell can be used to change the phase separation processes of the LCs and PVK films. Because of photo-induced thermal and photoisomerization effects resulting from the doped azo dye, the two effects can modulate the solubility and phase separation process between the DDLCs and PVK. Thus, we can control the scattering performance of the PVK film-based LC device with light intensity. Experimentally, it is found that the device can achieve several stable states with transmittance ranging from 0.1% to 41.2%. Moreover, the particular TIPS mentioned above can be used to reverse the stable states back to the original scattering state. Thus, the mechanism can be applied for uses as optically controllable LC displays or other devices having features of low power consumption and multi-stability.
論文目次 摘要 I
Abstract IV
Acknowledgement VII
Contents VIII
List of tables XIII
List of figures XIV
Chapter 1 Introduction 1
1.1 Preface 1
1.2 Liquid crystals 3
1.2.1 History of liquid crystals 3
1.2.2 Category of liquid crystals 4
1.2.3 Physics of nematic liquid crystals 8
1.2.4 External influences on liquid crystals 16
1.2.5 LC alignment-Rubbing 20
1.3 Azo dyes 27
1.3.1 Photo-isomerization 27
1.3.2 Light-induced thermal effect 28
Chapter 2 Device relating theory 30
2.1 The transmissive modes of LC cell 30
2.1.1 Twisted nematic (TN) liquid crystals 30
2.1.2 Homogeneous alignment mode 33
2.1.3 Vertical alignment (VA) mode 35
2.1.4 Hybrid aligned nematic (HAN) mode 36
2.1.5 Axially-symmetry aligned mode 37
2.2 Organic polymers-Poly(N-vinylcarbazole) 40
2.2.1 Liquid crystal alignment based on the poly(N-vinylcarbazole) film 40
2.2.2 Relaxation and thermodynamics in polymers 42
2.2.3 Thermally-switched liquid crystal alignments based on the micro-Brownian motion 47
2.2.4 Photoconductivity of the poly(N-vinylcarbazole) 50
2.3 The scattering mode LC light shutters 52
2.3.1 The phase separation methods of PDLC 52
2.3.2 Scattering properties of liquid crystal/polymer composites 59
2.3.3 Light scattering-Orientational fluctuations 61
2.4 Photo-induced molecular reorientation 65
2.4.1 Jánossy Effect: Positive Torque 65
2.4.2 Gibbons’ model: Negative Torque 66
Chapter 3 Experiment preparations 68
3.1 Materials used 68
3.1.1 Liquid crystals 68
3.1.2 Organic polymer-Poly(N-vinylcarbazole) 70
3.1.3 Azo dye-Disperse red 1 (DR1) 71
3.2 Fabrications of samples 73
3.3 Analyzing tools 77
3.3.1 Polarized optical microscope (POM) 77
3.3.2 Atomic force microscopy (AFM) 78
3.3.3 Scanning electron microscope (SEM) 80
3.3.4 Alpha-step profilometer 81
3.3.5 Temperature controller 82
3.3.6 Thermal imager 83
Chapter 4 Alignment effects based on the poly(N-vinylcarbazole) film and its applications 86
4.1 Introduction 86
4.2 Radial LC alignment 88
4.2.1 Reviews of the axially symmetric LC alignment 88
4.2.2 Experiments 89
4.2.3 Results and discussions 91
4.3 Thermally-switched LC alignments 99
4.3.1 Reviews of the thermally-switched LC alignments 99
4.3.2 Experiments 100
4.3.3 Results and discussions 101
4.4 Conclusions 109
Chapter 5 Phase separation induced LC scattering based on the poly(N-vinylcarbazole) films 111
5.1 Particular thermally induced phase separation and its application 111
5.1.1 Reviews of the particular thermally induced phase separation 111
5.1.2 Experiments 112
5.1.3 Results and discussions 113
5.2 Optically controllable light scattering based on dye-doped liquid
crystals 125
5.2.1 Reviews of the optically controllable light scattering 125
5.2.2 Experiments 127
5.2.3 Results and discussions 128
5.3 Conclusions 141
Chapter 6 Conclusions and future works 143
6.1 Conclusions 143
6.2 Future works 147
References 149
List of publications 163
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