Abstract
We prepared poly(6-[4-(4'-cyanophenyl)phenoxy]hexyl acrylate)s with various molecular weights (Mn) and narrow molecular weight distributions, and examined the Mn dependence of phase behavior which includes the reentrant nematic (RN) phase. Polymers with Mn lower than 20,000 form nematic (N), smectic A (SmA) and RN phases as temperature decreases, while ones with Mn higher than 20,000 form only N phase. The disappearance of SmA in longer chains is caused by the decrease in N-SmA temperature and the increase of SmA-RN one with increasing Mn. Result indicates that the polymer length is one of the significant factors affecting the reentrant behavior in side-chain liquid crystalline (LC) polymers.
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