臺灣博碩士論文加值系統

本研究主要是在說明旋光性層列相液晶其結構與性質之間的關係，以 (S)- [1-methyl-2-(2’-methylsulfanylethoxy)] ethanol 為起始物合成一系列旋光性液晶材料，並探討非旋光末端烷鏈長度’m’對於液晶相及物理光電特性的影響，以建立分子結構與旋光液晶相的關係。
實驗結果顯示：第一系列液晶材料 I(m=8-12)只出現SmA*一種液晶相。在第二系列II(m=8-10)出現了SmA*,SmC* 和SmCA* 三種液晶相。在第二系列中增加非旋光烷鏈長度‘m’ 會降低澄清點相轉移溫度範圍、降低SmA*相轉移溫度範圍、提高SmC*液晶相轉移溫度範圍以及降低SmCA*液晶相範圍
第二系列液晶化合物在SmC*液晶相進行光電量測時顯示在改變溫度和頻率下可得到V型轉換行為，而在SmCA*液晶相中，則可得到雙遲滯轉換行為。電流轉換行為的量測結果則不會受到非旋光末端烷鏈長度’m’ 的改變而有太大的差異。第二系列的自發性極化值最大值介於9~33 nC/cm2 和傾斜角最大值介於31o~35o。

Research this prove optical rotation layer arrange looks relation between the his structure and nature of liquid crystal mainly, Israel (S) -[1-methyl-2-(2' -methylsulfanylethoxy) ]Ethanol formates a series of optical rotation liquid crystal materials for the initial thing, probe into and does not fasten all end length ' m ' of alkane chain it to the looks of the liquid crystal and influence of the photoelectric characteristic of physics, in order to establish molecular structure and relation of fastenning the looks of all liquid crystal.
The experimental result shows: The first serial of liquid crystal material I (m=8-12) only shows SmA* phase. In the second serial II (m=8-10) shows SmA*, SmC* and SmCA* three kinds of liquid crystal phases. Change and does not fasten all end length ' m ' of alkane chain, find it with not fastenning the increase of all end length ' m ' of alkane chain, the reducing thereupon of temperature range of the looks of the liquid crystal, namely clarify some temperature with rising with reducing, crystalline temperature temperature
The second serial liquid crystal chemical compound shows when SmC* liquid crystal carries on the photoelectricity amount to examine that can get the V type and change the behavior under changing the temperature and frequency, electric current change quantity of behavior examine result can is it fasten all end alkane chain length ' m ' is it have heavy difference too to change to receive. Second series of spontaneity polarization values maximum lie between 93 nC/cm2 and angle of inclination maximum lie between 31o- 35o.

中文摘要....................................................................I
ENGLISH ABSTRACT............................................................II
TABLE OF CONTENTS...........................................................III
LIST OF FIGURES………………………………………………………………………………VI
LIST OF TABLE………………………………………………………………………………..VIII
CHAPTER
INTRODUCTION………………………………………………………………………………..1
1.1 Overview……………………………………………………………………………………….1
1.2 Chiral liguid crystal phase……………………………………………………………………...1
1.2.1 Chiral smectic A phases (SmA*)……………………………………………………………..2
1.2.2 Chiral smectic C phase (SmC*, Ferroelectric)……………………………………………….3
1.2.3 Antiferroelectric phases (SmCA*)…………………………………………………………….8
1.3 The characteristics and the physical properties of antiferroelectric phase……………………..12
1.4 Motivation of Study……………………………………………………………………………15
CHAPTER 2
EXPERIMENTAL…………………………………………………………..……………………17
2.1 Preparation of materials………………………………………………………………………..17


2.1.1 Synthesis of 4-alkyloxybenzoic acids. I-1(m=8-12), and 4-(4’-alkoxyphenyl) benzoic acids,
II-1(m=8-12)………………………………………………………………………………….18
2.1.2 Synthesis of 6-methoxycarbonyloxy-2-naphthoic acid, MCONA, I-2………………………18
2.1.3. Synthesis of (S)-[1-methyl-2-(2’-methylsulfanylethoxy)]ethanol, I-3……………………...20
2.1.4 Synthesis of (R)-[1-methyl-2-(2’-methylsulfanylethoxy)]ethyl 6-methoxycarbonyloxy -2-naphthoate, I-4……………………………………………………………………………21
2.1.5 Synthesis of (R)-[1-methyl-2-(2’-methylsulfanylethoxy)]ethyl-6-hydroxy -2- naphthoate,
I-5.......……………………………………………………………………………………….22
2.1.6 Synthesis of (R)-[1-methyl-2-(2’-methylsulfanylethoxy)] ethyl 6-(4-alkyloxybenzoyloxy)-2-naphthoate, I-6(m=8-12) and (R)-[1-methyl-2- (2’-methylsulfanylethoxy)] ethyl 6-[(4’-alkoxyphenyl)benzoyloxy] -2-naphthoate, II-6(m=8-12)………………………………………………………………………………...23
2.2 Characterization of Materials…………………………………………………………………..25
2.2.1 Masophase Identification…………………………………………………………………….25
2.2.2 Preparation of homogenous cells…………………………………………………………….25
2.2.3 Alignment of liquid crystals in SSFLC Cells………………………………………………...25
2.2.4 The Spontaneous Polarization (Ps) Measurement…………………………………………...26
2.2.5 The Optical Response Measurement………………………………………………………...29


2.2.6 Dielectric Constant Measurement……………………………………………………………30
2.2.7 Measurement of apparent tilt angle…………………………………………………………..30
CHAPTER 3
RESULTS AND DISCUSSION…………………………………………………………………..31
3.1 Chemical structure identification………………………………………………………………31
3.2 The effect of peripheral chain length; I (n=1) (m=8-12)………………………………………38
3.2.1 Transition temperatures and mesomorphic properties……………………………………….38
3.2.2 Differential scanning calorimetric (DSC)……………………………………………………39
3.3 The effect of peripheral chain length; II (n=2) (m=8-12)……………………………………...42
3.3.1 Transition temperatures and mesomorphic properties……………………………………….42
3.3.2 Differential Scanning Calorimetric (DSC)…………………………………………………..44
3.3.3 Switching behavior…………………………………………………………………………..49
3.3.4 Spontaneous polarization (PS)……………………………………………………………… 51
3.3.5 Tilt angle for the compounds II (m=8-12)…………………………………………………...52
3.3.6 Electro-optical responses…………………………………………………………………….53
3.3.7 Dielectric properties………………………………………………………………………….55
CHAPTER 4
CONCLUSIONS………………………………………………………………………………….57
REFERENCES………………...………………………………………………………………….58

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