Molecular engineering of liquid crystal polymers by living polymerization. XXII. Synthesis and characterization of binary copolymers of 11-[4-cyano-4′-biphenyl)oxy]undecanyl vinyl ether with (2S, 3S)-(+)-2-chloro-3-methylpentyl 4′-(8-vinyloxyoctyloxy)biphenyl-4-carboxylate, and of (2S, 3S)-(+)-2-chloro-3-methylpentyl 4′-(8-vinyloxyoctyloxy)biphenyl-4-carboxylate with 3-[4-cyano-4′-biphenyl)oxy]propyl vinyl ether