Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 7. Influence of Copolymer Composition on the Phase Behavior pf Poly(11-((4-cyano-4'Biphenyl)oxy)undecanyl Vinyl Ether-co-2-((4-Cyano-4'- Biphenyl)oxy)ethyl Vinyl Ether)
CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE
Pagination or Media Count:
This paper describes the synthesis of poly 11-4-cyano-4 -biphenyl oxyundecanyl vinyl ether-co-2-4-cyano-4biphenyloxyethyl vinyl ether AB poly6-11-co-6-2AB where AB refers to the molar ratio between the monomers 6-11 and 6-2, with number average molecular weights above 15, by living cationic polymerization. The phase behavior of the resulting copolymers was discussed as a function of copolymer composition. Within this range of molecular weights, in the first heating scan poly6-11 exhibits a melting and an enantiotropic sA phase, while poly6-2 only a glass transition temperature. Depending on composition, poly6-11-CO6-2AB either display an enantiotropic nematic, enantiotropic sA or both enantiotropic nematic and anantiotropic sA phases.
- Organic Chemistry