Polymerization of liquid-crystalline monomers having a Schiff-base structure

被引：22

作者：

Ogiri, S ^{[1
]}

Ikeda, M ^{[1
]}

Kanazawa, A ^{[1
]}

Shiono, T ^{[1
]}

Ikeda, T ^{[1
]}

机构：

[1] Tokyo Inst Technol, Resources Utilizat Res Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

POLYMER | 1999年 / 40卷 / 08期

关键词：

Schiff-base; liquid crystal; orientation;

D O I：

10.1016/S0032-3861(98)00421-2

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Vinyl monomers having a Schiff-base structure were synthesized and their thermal and photopolymerization behavior was explored for different phases of the monomers. It was found that conversion of the monomers increased with temperature in the nematic phase, while it decreased in the isotropic phase. This result suggests that the polymerization behavior may be affected by the molecular alignment. Arrhenius plots for the initial rates of photopolymerization showed a straight line, while those of thermal polymerization changed in slope at the nematic-isotropic phase transition temperature. For MBEA, the number-average molecular weight of the polymer produced by thermal polymerization in the nematic phase was higher than that in the isotropic phase. For ABBA, it was observed that birefringence partially remained in the polymer produced in the nematic phase, although polymer produced by solution polymerization showed no liquid-crystalline phase. In addition, the orientation of the crosslinked polymer obtained by photopolymerization was better than that of the polymer produced by thermal polymerization. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：2145 / 2150

页数：6

共 28 条

[21]

PERPLIES E, 1974, MAKROMOL CHEM, V175, P553

[22] POLYREACTIONS IN ORIENTED SYSTEMS .8. POLYMERIZATION OF A LIQUID-CRYSTALLINE MONOMER UNDER INFLUENCE OF A HIGH MAGNETIC-FIELD [J].

PERPLIES, E ;

RINGSDORF, H ;

WENDORFF, JH .

JOURNAL OF POLYMER SCIENCE PART C-POLYMER LETTERS, 1975, 13 (04) :243-246

[23]

RABEK JF, 1987, MECH PHOTOPHYSICAL P, P306

[24]

RINGSDORF H, 1959, MAKROMOL CHEM, V1, P27

[25] Thermal reversibility of ordered, photocrosslinked liquid crystalline poly(vinyl ether)s [J].

Sahlen, F ;

Andersson, H ;

Hult, A ;

Gedde, UW ;

Ania, F .

POLYMER, 1996, 37 (13) :2657-2662

[26] Synthesis and characterization of bifunctional liquid-crystalline monomers showing smectic C phase. Photopolymerization and cross-linking [J].

Sahlen, F ;

Trollsas, M ;

Hult, A ;

Gedde, UW .

CHEMISTRY OF MATERIALS, 1996, 8 (02) :382-388

[27]

STRZELEC.L, 1973, B SOC CHIM FR, P605

[28] Phase effects on the polymerization of a styryloxy cholesteric liquid crystalline monomer [J].

Williamson, SE ;

Kang, D ;

Hoyle, CE .

MACROMOLECULES, 1996, 29 (27) :8656-8665

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