Abstract

Abstract Cure kinetics and energetics and phase behavior of a liquid crystal (LC)/matrix mixture have been investigated. This research complements a previous study of phase separation in mixtures of low molecular weight liquid crystals with an organic matrix. In the present case we used a LC with a molecular weight about twice that of the previous ones. For some samples we found evidence for phase separation and an anomalous phase transition (possibly a smectic induced by confinement of the LC in microvolumes). The effects of cure temperature. T cure, on the cure kinetics and energetics were similar to those found for previously studied UV-cured systems. Plots of the heats of cure for the pure matrix and LC/matrix mixtures go through maxima at temperatures where the extent of matrix cure is greatest. The fact that the nematic-isotropic (NI) transition enthalpy is maximum in the same temperature range confirms previous conclusions that phase separation is greatest when the matrix is most fully cured, The t...

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