TIME-RESOLVED OBSERVATION OF PHOTOCHEMICAL PHASE-TRANSITION IN POLYMER LIQUID-CRYSTALS

被引：49

作者：

SASAKI, T ^{[1
]}

IKEDA, T ^{[1
]}

ICHIMURA, K ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,DIV PHOTOCHEM PROC,4259 NAGATSUTA,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

MACROMOLECULES | 1992年 / 25卷 / 14期

关键词：

D O I：

10.1021/ma00040a030

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Time-resolved measurements were performed on photochemically induced isothermal phase transitions of polymer liquid crystals (PLCs). Two types of PLCs were employed. One type consists of PLCs with mesogenic side chains of phenyl benzoate and cyanobiphenyl, which were doped with azobenzene derivatives. The other consists of copolymers in which azobenzene units were covalently attached to the same chain as the mesogenic side chains. Using a nanosecond pulsed laser, we found that the relaxation time required for the nematic (N) to isotropic (I) phase transition was in a time range of 10 (copolymer LC)-100 ms (homopolymer LC doped with azobenzene derivative) at T/T(NI) = 0.999, which was comparable to tha of low molecular weight liquid crystals. Effects of temperature, laser power, and the structure of photoresponsive guest molecules were discussed.

引用

页码：3807 / 3811

页数：5

共 17 条

[1] OPTICAL-TECHNOLOGY - NOVEL OPTICAL-PROPERTIES OF LIQUID-CRYSTAL POLYMERS [J].