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Copolymers composed of various amounts of 4‘-(11-acryloyloxyundecyloxy)biphenyl-4-carboxylic acid (11ABA) and acrylic acid (AA), poly(11ABA- co -AA)s, were synthesized, and their liquid crystalline structures were investigated both in dry and in water-swollen states. Wide- and small-angle X-ray studies revealed that both dry and swollen poly(11ABA- co -AA)s show a liquid crystalline structure, which transforms from smectic C with the bilayer (SmC 2 ) to smectic C with the monolayer (SmC 1 ), when the 11ABA composition, F ([11ABA]/([11ABA] + [AA])), decreases from 0.72 to 0.44. The phase diagram of these copolymers was established by changing F and the temperature. It shows that the samples can build up a liquid crystalline structure for F as low as 0.07 at the elevated temperature of 155 °C. The enhanced ordering of the liquid crystalline structure and the thermostability of the copolymers were explained in terms of hydrogen bonding formed between carboxyls of mesogenic side chains and AA.
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Kaneko et al. (2001) studied this question.
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