Aneta Mirčeva, Miroslav Huskić, Majda Žigon
National Institute of Chemistry, 1000 Ljubljana, Slovenia
A series of low molecular weight side-chain liquid crystal polyesters
with azobenzene side chain mesogenic units were synthesised by transesterification
of dimethyl terephthalate and a-(bis(2-hydroxyethyl)amino)-omega-(4-methoxyazobenzene-4'-oxy)
alkanes (Cn-diol, n=8, 10, 12). Monotropic low molecular weight liquid
crystalline polyesters were synthesized using a reactant molar ratio of
1:1.2; upon cooling from the isotropic phase they form a smectic phase.
With reactant molar ratios of 1:1.4 and 1:1.6 only oligomers were formed,
which melt over a broad temperature range, thus preventing the determination
of possible mesophase transitions.