Synthesis and Characterization of Liquid Crystalline Poly((N-acylethyleneimine)s

摘要

The synthesis of three cyclic imino ethers containing mesogenic groups attached to the heterocyclic unit through flexible spacers described. Cationic ring opening isomerization polymerization of the two of them, i.e., 2-(4-(4-meth-oxy-4'-biphenyloxy)butyl)-2-oxazoline (MeOBiph-4-Oxz) and 2-(6-(4-methoxy-4'-bi-phenyloxy)hexyl)-2-oxazoline (MeOBiPh-6-Oxz) provided thermotropic liquid crystalline (LC) poly(N-acylethylene-imine)s, while the polymerization of 2-(4-(4-phenylphenoxy) butyl)-2-oxazoline (BiPh-4-Oxz) led to a crystalline polymer.