以甲氧基為連結基且含(S)-2-(6-氫氧基-2-萘基)丙酸之旋光性液晶衍生物的合成及其光電性質的探討

SYNTHESIS AND ELECTRO-OPTICAL PROPERTIES OF NEW CHIRAL LIQUID CRYSTAL DERIVED FROM (S)-2-(6-HYDROXY-2-NAPHTHYL)PROPIONIC ACID WITH METHYLENEOXY LINKING GROUP

黃宏祥(Hung-hsiang Huang)

指導教授 ： 吳勛隆

大同大學/工程學院/化學工程學系所/碩士(2004年)

摘要

本實驗以 (S)-2-(6-methoxy-2-naphthly)propionic acid為起始物合成三系列具有methyleneoxy為連結基的旋光性酯類液晶材料，並探討其分子結構與誘電性液晶性質的關係。所有合成的旋光性材料I(m=8~12)、II(m=8~12)及III(m=8~12)均具有SmA*與SmC*兩種液晶相，隨著非旋光末端烷鏈長度’m’的增加，澄清點會隨著降低。
量測化合物I(m=10~12)、II(m=10~12)及III(m=10~12)的自發性極化值，最大值介於12.3 ~19.1nC/cm2。
比較化合物I(m=10)、II(m=10)及III(m=10)的傾斜角，發現隨著旋光末端烷鏈長度’n’的增加，傾斜角會隨之變小。傾斜角最大值介於25~30度。
總而言之，旋光末端烷鏈長度及非旋光末端烷鏈長度都會影響到液晶材料的物理性質。

關鍵字

旋光性液晶 ； 甲氧基 ； 丙酸

並列摘要

Three homologous series of chiral esters derived from (S)-2-(6-methoxy-2-naphthly)propionic acid with methyleneoxy linking group were synthesized. The correlation between the molecular structure and the ferroelectric liquid crystal (FLC) property has been investigated.Three series of chiral materials I(m=8~12), II(m=8~12), and III(m=8~12), displayed enantiotropic mesophases of the SmA* and SmC* phases. The clearing points for the three series decrease with increasing of the nonchiral terminal chain length ‘m’.
The maximum Ps values of I(m=10~12), II(m=10~12), and III(m=10~12) vary from 12.3 to 19.1nC/cm2.
Comparing the tilt angles of I(m=10), II(m=10), and III(m=10), the maximum tilt angle values were in the range of 25~30 degrees. There is a decreasing tendency of tilt angle as increasing chiral chain length.

並列關鍵字

CHIRAL LIQUID ； PROPIONIC

參考文獻

[1] LAI, F. –S., 2003, “Synthesis and Electro-optical Properties of New Chiral Liquid Crystal Derived From (S)-Lactic Acid”, Master Thesis, Dept. of Chem Eng. Tatung Inst. Of Tech., Taiwan, R. O. C.

[2] MEYER, R. B., June, Paper presented at the 5th International Liquid Crystal Conference, Stockholm.

[6] MEYER, R. B., 1976, Mol. Cryst. Liq. Cryst., 40, 74.

[7] CLARK, N. A., and LAGERWALL, S. T., 1984, Ferroelectrics, 59, 25.

[8] LAI, F. –S., 2003, “Synthesis and Electro-optical Properties of New Chiral Liquid Crystal Derived From (S)-Lactic Acid”, Master Thesis, Dept. of Chem Eng. Tatung Inst. Of Tech., Taiwan, R. O. C.