Thermal and liquid crystalline properties of a polymer with amphiphilic-mesogenic side-chains

摘要

A low-molecular-weight liquid crystalline amphiphilic compound (Az6Bu) and a liquid crystalline polymethacrylate [P(Az6Bu)] with amphiphilic-mesogenic side-chains are reported in this present paper.A polyethyleneimine chain with 2-hydroxyethyl side-groups was used as the water-soluble spacer.Az6Bu exhibited a lyotropic columnar phase and no thermotropic mesophase.P(Az6Bu) showed thermotropic and lyotropic liquid crystalline properties.P(Az6Bu) formed thermotropic smectic A and C mesophases on the heating and cooling processes.The lyotropic systems consisting of P(Az6Bu) and water exhibited a smectic C lyomesophase with oilystreak and schlieren textures.The layered structures formed in the thermotropic and lyotropic mesophases are composed of a sublayer produced by the anisotropic alignment of aromatic-mesogenic groups and a sublayer of hydrophilic groups.