Abstract
In order to clarify the effect of the specific interaction of hydrogen bonding between urethane bonds (H-bonding) on the mesomorphic properties for side chain type liquid crystalline polyurethanes with a rigid moiety in the polymer backbone (rigid SLCPUs), side chain type polyurethane derivatives where hydrogen in urethane bonds were replaced with methyl groups were prepared by two synthetic routes, namely polycondensation and polymeric reaction. Their thermal properties were investigated by polarizing optical microscopy and differential scanning calorimetry (DSC) measurements. The original rigid SLCPUs exhibited mesomorphic properties, however, no mesomorphic properties were demonstrated in the polyurethane derivatives, regardless of the flexible spacer length. Therefore we concluded that the lateral interaction originating from H-bonding played an important role in the exhibition of mesomorphic properties for the rigid SLCPUs.
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Mihara, T., Koide, N. The Influence of Hydrogen Bonding on the Mesomorphic Properties of Side Chain Type Liquid Crystalline Polyurethanes with Rigid Moieties in the Polymer Backbone. Polym J 29, 138–141 (1997). https://doi.org/10.1295/polymj.29.138
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DOI: https://doi.org/10.1295/polymj.29.138
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