Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization.20. Synthesis and Characterization of Binary Copolymers of (11-(4-Cyano-4'-biphenyl) Oxy)undecanyl Vinyl Ether with n-Butyl Vinyl Ether and of (2-(4-Cyano-4'biphenyl)oxy)ethyl V

摘要

Copolymerization represents the simplest synthetic technique which can be used totailor make phase transitions of both main chain and side chain liquid crystalline polymers. Indeed, copolymerization was frequently employed to manipulate the phase transitions of side chain liquid crystalline polymers. However, most of the results reported in the literature can be considered only in a qualitative way, since there are only very few cases in which information about both copolymer composition and molecular weight are available. A general classification of side chain liquid crystalline copolymers was recently discussed in a review article. There are two main classes of side chain liquid crystalline copolymers. The first one refers to copolymers containing pairs of structural units with and without mesogenic units. The second class refers to copolymers based on pairs of structural units containing mesogenic units in each structural unit.