A new family of liquid crystal forming compounds, polyethers constituted of a mesogen (α-methylstilbene) and flexible aliphatic spacers provides a ready realization of isotropic-liquid crystal-true crystal regimes in one and the same material in a convenient temperature range without degradation problems. Within the thermotropic range the isotropization temperature was found to be variable, affected by preceding thermal treatment: heat treatment shifts the transition to higher temperatures with correspondingly higher heat of isotropization. The effect was found to correlate with coarsening of visible texture.
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Feijoo et al. (1988) studied this question.