Side chain liquid crystalline elastomers I - Phase behavior of their precursors

Side chain liquid crystalline polyesters (PMx) were synthesized through the melt polymerization between N-6-(4-((4'-nitrophenyl)azo) phenyl)oxy)hexyl diethanolamine (C6), maleic anhydride and succinic anhydride. The effect of the polymer backbone on the phase behavior of PMx was studied by DSC, pola rized optical microscopy (POM) and wide angle X-ray diffraction (WAXD) and the results showed that smectic -isotropic transition temperature (T-SI) in creased largely, while melting temperatures (Tm) decreased slightly and Tg increased slightly with the increase of the content of maleic anhydride in the copolymers. The results also indicated that introduction of maleic anhy dride to polymer backbone was unfavorite of the molten crystallization of t he side chains. The IR-dichroism study on the side chain liquid crystalline elastomers prepared from PMx showed that the elastomers exhibited anisotro pic behavior after stretching under the mechanical fields.