Abstract
Side chain type liquid crystalline polyurethane (SLCPU)s containing various kinds of mesogenic groups were prepared by polyaddition of a diol-monomer with p-phenylenediisocyanate. Three SLCPUs (PU-a, b, and c) exhibited typical mesomorphic properties. Further, the relationship between mesomorphic properties and hydrogen bonding between urethane bonds in the polymer backbone (H-bonding) for the three SLCPUs was investigated by thermally controlled FT-IR. A small decrease in the strength of H-bonding was observed with increasing temperature. The magnitude of the decrease in the strength of H-bonding was dependent on the species of the mesogenic group.
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