Liquid crystalline polymers. 12 - Thermal behaviour of some aromatic polyethers containing azobenzene and biphenyl moieties

Authors
Catanescu, O Hurduc, N Scutaru, D Sava, I Parashiv, I Alazaroaie, S
Citation
O. Catanescu et al., Liquid crystalline polymers. 12 - Thermal behaviour of some aromatic polyethers containing azobenzene and biphenyl moieties, REV RO CHIM, 45(7-8), 2000, pp. 709-715
Citations number
8
Categorie Soggetti
Chemistry
Journal title
REVUE ROUMAINE DE CHIMIE
ISSN journal
00353930 → ACNP
Volume
45
Issue
7-8
Year of publication
2000
Pages
709 - 715
Database
ISI
SICI code
0035-3930(200007/08)45:7-8<709:LCP1-T>2.0.ZU;2-R
Abstract
The present paper studies the influence of two different spacers used in co polymerization reactions over the capacity of generating a mesophase. The p olymers were synthesized by phase transfer catalysis in liquid-liquid syste m starting from 4,4'-dihydroxyazobenzene (DHAB) and 4,4'-dihydroxybiphenyl (DHD) as mesogen groups and 1,3-dibromopropane (DBP), bis(2-chloroethyl)eth er (BCEE), 1,6-dichlorohexane (DCH) and bis(2-chloromethyl)oxetane (BCMO) a s spacers. The copolyethers were characterised by H-1-NMR, DSC and optical microscopy techniques. Only DHAB based polymers presented liquid crystallin e properties, the mesophase behaviour being an enantiotropic one.