Synthesis and Mesomorphic Behavior of Poly((2S, 3S)-(+)-2-Chloro-3-Methylpentyl 4'-(Omega-Vinyloxyalkyloxy)biphenyl-4-Carboxylate)s with Ethyl and Propyl Alkyl Groups.

摘要

The synthesis and cationic polymerization of (2S, 3S)-(+)-2-chloro-3-methylpentyl 4'-(2-vinyloxyethyloxy)biphenyl-4-carboxylate (15-2) and (2S, 3S)-(+)-2-chloro-3-methylpentyl 4'-(3-vinyloxyethyloxy)biphenyl-4-carboxylate (15-3) are described. The mesogenic behavior of the resulting polymers is discussed as a function of the molecular weight and spacer length. Based on the second and subsequent heating and cooling scans, poly(15-2)s exhibit an enantiotropic S(x) (unidentified smectic) phase. Poly (15-3)s show an enantiotropic cholesteric phase and an inverse monotropic S(x) phase.