Brushes of liquid crystalline polymers swollen by nematic solvents are described by an extended Alexander model. Long-main-chain LCP with hairpins are considered. For the case of homogeneous anchoring a second-order tilting phase transition is expected as the grafting density is increased. When the grafting density is subcritical the transition can be triggered by very weak electrical or magnetic fields.
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Halperin et al. (1993) studied this question.
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