Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 10. Influence of Molecular Weight on the Phase Transitions of Poly(Omega-((4-Cyano-4'-Biphenyl)oxy)alkyl Vinyl Ethers)s with Nonyl and Decanyl Alkyl Groups
CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE
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The first goal of this series of publications is to provide a complete elucidation of the influence of molecular weight on the phase behavior of poly omega-4-CYANO-4-BIPHENYLOXYaklyl vinyl ether s containing alkyl groups from ethyl to undecanyl. The goal of this paper is to describe the synthesis and living cationic polymerization of the last two monomers from this series, i.e., 9-4-CYANO-4-BIPHENYLOXYnonyl vinyl ether 6-9 and 10-4-CYANO- 4-BIPHENYLOXYdecanyl vinyl ether 6-10. The influence of molecular weight on their phase transitions will be discussed by comparison to that of 9-4-CYANO- 4-BIPHENYLOXYdecanyl ethyl ether 8-10 which represents the model compounds of the monomeric structural units of poly 6-9 and poly 6-10. Then, the mesomorphic behavior of polyw-4-CYANO-4-BIPHENYLOXYalkyl vinyl ether s with alkyl groups containing from two to eleven methylenic units will be comparatively discussed at four different degrees of polymerization 30, 23, 13 and 4. The implication of different phase transitions at various molecular weights on the molecular design of novel macromolecular architectures based on side charm liquid crystalline polymers is briefly discussed.
- Organic Chemistry