Molecular Engineering of Liquid Crystalline Polymers by Living Polymerization. 9.Living Cationic Polymerization of 5-((4-Cyano-4'-Biphenyl)oxy)pentyl Vinyl Ethers and 7-((4-Cyano-4'-Biphenyl)oxy)heptyl Vinyl Ether, and the Mesomorphic Behavior of the Resu

摘要

The synthesis and living cationic polymerization of 5-((4-cyano-4'-biphenyl)oxy)pentyl vinyl ether (6-5)and 7-((4-cyano-4'biphenyl)oxy)heptyl vinyl ether (6-7) are presented. The influence of molecular weight on the mesomorphic behavior of poly(6-5) and poly(6-7) is discussed and compared to that of 5-((4-cyano-4'-biphenyl)oxy)pentyl ethyl ether (8-5) and 7((4-cyano-4'-biphenyl)oxy)heptyl ethyl ether (8-7) which are models of the monomeric structural units of poly(6-5) and poly(6-7). Both (8-5) and (8-7) exhibit a monotropic nematic mesophase. (VP)