Summary
A 1/1 molar ratio of 2-[(4-cyano-4′-biphenyl)oxy]ethyl vinyl ether (6–2) and 8-[(4-cyano-4′-biphenyl)oxy]octyl vinyl ether (6–8) was cationically copolymerized with the initiating system CF3SO3H/(CH3)2S in methylene chloride at 0°C. All copolymers present narrow molecular weight distributions, and number average molecular weights which exhibit a linear dependence on [M]o/[I]o. Copolymers with degrees of polymerization lower than 14 exhibit an enantiotrpic nematic mesophase regardless of the thermal history of the sample. Copolymers with higher molecular weights exhibit an inverse monotropic smectic-A and an enantiotropic nematic mesophase in the first heating scan and only an enantiotropic nematic mesophase in the subsequent heating scans.
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Percec, V., Lee, M. Molecular engineering of liquid crystal polymers by living polymerization. Polymer Bulletin 25, 123–129 (1991). https://doi.org/10.1007/BF00338909
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DOI: https://doi.org/10.1007/BF00338909