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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 behaviour 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. Poly (6-5) with degrees of polymerization equal to and lower than six exhibit an enantiotropic nematic mesophase. Poly(6-5)s with higher degrees of polymerization display both smectic A and nematic enantiotropic mesophases. Poly (6-7) exhibits an enantiotropic smectic A mesophase over the entire range of molecular weights.

Посилання на статтю:

Molecular engineering of liquid crystal polymers by living polymerization: 9. Living cationic polymerization of 5-[ (4-cyano-4'-biphenyl)oxy ] pentyl vinyl ether and 7-[ (4-cyano-4'-biphenyl)oxy ] heptyl vinyl ether, and the mesomorphic behaviour of the resulting polymers / V. Percec*, M. Lee and C. Ackerman // Polymer. – 1992. – Vol 33. – P. 703-711.

Molecular engineering of liquid crystal polymers by living polymerization: 9. Living cationic polymerization of 5-[ (4-cyano-4'-biphenyl)oxy ] pentyl vinyl ether and 7-[ (4-cyano-4'-biphenyl)oxy ] heptyl vinyl ether, and the mesomorphic behaviour of the resulting polymers - Завантажити.