Synthesis and characterization of six-arm star-shaped liquid crystalline cyclotriphosphazenes

被引：29

作者：

Bao, Rui ^{[1
]}

Pan, Min ^{[1
]}

Qiu, Jin Jun ^{[1
]}

Liu, Cheng Mei ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Wuhan 430074, Peoples R China

来源：

CHINESE CHEMICAL LETTERS | 2010年 / 21卷 / 06期

关键词：

Cyclotriphosphazene; Cyanostilbene; Liquid crystal; Star-shaped molecule; Synthesis; COPOLYMERS;

D O I：

10.1016/j.cclet.2009.12.020

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The synthesis and mesomorphic properties of a new class of liquid crystalline cyclotriphosphazenes with rigid cyanostilbene groups and flexible alkoxy groups are reported. The thermal behaviors of cyclotriphosphazene derivatives 5a-5d are studied by the means of differential scanning calorimetry, polarizing optical microscopy. Nematic phases were observed in compounds 5a-5d both on heating and cooling. The clear temperatures of compounds 5a-5d slightly increased with increasing length of terminal alkyl chain. Compounds 5a-5d showed different mesogenic region from minimum 5 degrees C to maximum 142 degrees C. (C) 2009 Cheng Mei Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

引用

页码：682 / 685

页数：4

共 16 条

[1] LIQUID-CRYSTALLINE PHOSPHAZENES - HIGH POLYMERIC AND CYCLIC TRIMERIC SYSTEMS WITH AROMATIC AZO SIDE GROUPS [J].

ALLCOCK, HR ;

KIM, C .

MACROMOLECULES, 1989, 22 (06) :2596-2602

[2] Columnar mesomorphic organizations in cyclotriphosphazenes [J].

Barberá, J ;

Bardají, M ;

Jiménez, J ;

Laguna, A ;

Martínez, MP ;

Oriol, L ;

Serrano, JL ;

Zaragozano, I .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (25) :8994-9002

[3] Cyclotriphosphazene as a dendritic core for the preparation of columnar supermolecular liquid crystals [J].

Barbera, Joaquin ;

Jimenez, Josefina ;

Laguna, Antonio ;

Oriol, Luis ;

Perez, Sonia ;

Serrano, Jose Luis .

CHEMISTRY OF MATERIALS, 2006, 18 (23) :5437-5445

[4] POLYAMINOPHOSPHINES CONTAINING DENDRIMERS - SYNTHESES AND CHARACTERIZATIONS [J].

GALLIOT, C ;

PREVOTE, D ;

CAMINADE, AM ;

MAJORAL, JP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1995, 117 (20) :5470-5476

[5] A LIQUID-CRYSTALLINE POLY(ORGANOPHOSPHAZENE) [J].

KIM, C ;

ALLCOCK, HR .

MACROMOLECULES, 1987, 20 (07) :1726-1727

[6] Polyesters with built-in threshold temperature and deformation sensors [J].

Kinami, M ;

Crenshaw, BR ;

Weder, C .

CHEMISTRY OF MATERIALS, 2006, 18 (04) :946-955

[7] Cellulose derivative and liquid crystal blend membranes for oxygen enrichment [J].

Li, XG ;

Huang, MR ;

Hu, L ;

Lin, G ;

Yang, PC .

EUROPEAN POLYMER JOURNAL, 1999, 35 (01) :157-166

[8] Textures of thermotropic liquid-crystalline copolymers containing either 2,7-, 1,5- or 1,4-naphthalenediol or vanillic acid units [J].

Li, XG ;

Huang, MR .

ANGEWANDTE MAKROMOLEKULARE CHEMIE, 1997, 249 :163-181

[9] LIQUID-CRYSTALLINE PHASE-TRANSITIONS IN CYCLOTRIPHOSPHAZENES WITH DIFFERENT MESOGENIC MOIETIES IN THE SIDE-CHAINS [J].

MORIYA, K ;

SUZUKI, T ;

YANO, S ;

KAJIWARA, M .

LIQUID CRYSTALS, 1995, 19 (05) :711-713

[10] Thermal and structural study oil liquid-crystalline phase transition in hexakis(4-(4'-alkyloxy)biphenoxy)cyclotriphosphazene [J].

Moriya, K ;

Mizusaki, H ;

Kato, M ;

Suzuki, T ;

Yano, S ;

Kajiwara, M ;

Tashiro, K .

CHEMISTRY OF MATERIALS, 1997, 9 (01) :255-263

← 1 2 →