The Effect of the Polymer Backbone on the Thermotropic Behavior of Side-Chain Liquid Crystalline Polymers
CASE WESTERN RESERVE UNIV CLEVELAND OHDEPT OF MACROMOLECULAR SCIENCE
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Polyephichlorohydrin PECH and poly2,.6-dimethyl-1,4-phenylene oxide PPO containing pendant mesogenic units separated from the main chain through spacers of zero to ten methylene units were synthesized and characterized in order to test the spacer concept. Both polymers were modified by phase transfer catalyzed esterifications of the chloromethyl groups PECH or the bromobenzyl groups brominated PPO with potassium omega-4-oxybiphenyl alkanoates and potassium omega-4-methoxy-4-oxybiphenyl-alkanoates. While PPO required ten methylene units as spacer and 4,4-methoxybiphenyl as mesogen to present thermotropic liquid mesomorphism, PECH required no spacer. Keywords Side-chain thermotropic liquid crystalline polymers.
- Physical Chemistry
- Polymer Chemistry