The cholesteric polymer films described here, i.e., the “locked in” chiral nematic phase of polymer liquid crystals, have several advantages as materials for optical applications. The Figure shows schematically a cholesteric network based on a chiral isocyanate terpolymer in styrene in which the cholesteric liquid-crystalline structure is “locked in” by photopolymerization.
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Maxein et al. (1998) studied this question.