Ultraviolet stability of liquid crystals containing cyano and isothiocyanato terminal groups

被引：53

作者：

Wen, CH ^{[1
]}

Gauza, S ^{[1
]}

Wu, ST ^{[1
]}

机构：

[1] Univ Cent Florida, Coll Opt & Photon, Orlando, FL 32816 USA

来源：

LIQUID CRYSTALS | 2004年 / 31卷 / 11期

关键词：

D O I：

10.1080/02678290412331298076

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The ultraviolet (UV) stabilities of liquid crystal compounds containing cyano (CN) and isothiocyanato (NCS) terminal groups are compared. UV exposure is found to degrade the clearing temperature, birefringence, dielectric constants and visco-elastic coefficient of the liquid crystal compounds. The measured data show that the NCS molecular structure exhibits a better UV stability than do the corresponding CN structures. Lewis resonance structures are used to explain this phenomenon.

引用

页码：1479 / 1485

页数：7

共 21 条

[1]

BEZZANT RJ, 1967, BASIC ORGANIC CHEM

[2]

CAREY FA, 1977, ADV ORGANIC CHEM A, P125

[3] ISOTHIOCYANATES AND THEIR MIXTURES WITH A BROAD RANGE OF NEMATIC PHASE [J].

DABROWSKI, R .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1990, 191 :17-27

[4]

Geelhaar T., 1996, SOC INF DISPLAY, V27, P167

[5] FLUORINATED LIQUID-CRYSTALS FOR ACTIVE MATRIX DISPLAYS [J].

GOTO, Y ;

OGAWA, T ;

SAWADA, S ;

SUGIMORI, S .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1991, 209 :1-7

[6] NEW FAMILY OF NEMATIC LIQUID-CRYSTALS FOR DISPLAYS [J].

GRAY, GW ;

HARRISON, KJ ;

NASH, JA .

ELECTRONICS LETTERS, 1973, 9 (06) :130-131

[7] NEAR ULTRAVIOLET PHOTOSTABILITY OF LIQUID-CRYSTAL MIXTURES [J].

LACKNER, AM ;

MARGERUM, JD ;

VANAST, C .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1986, 141 (3-4) :289-310

[8]

Lueder Ernest., 2001, WILEY S DISP TECHNOL

[9]

MAIER W, 1960, Z NATURFORSCH PT A, V15, P287

[10]

MURRELL JN, 1965, VALENCE THEORY

← 1 2 3 →