Entropically driven re-entrant SmC-SmA-SmC phase transition in composite polymer–liquid-crystal systems
Department of Physics, University of Colorado, Boulder, CO 80309
Accepted: 26 October 1996
I consider the effects of polymers on the smectic phase of a host liquid-crystal matrix. Focusing on the regime in which the polymers are predominatly confined between the smectic layers, I find that the presence of the polymers can lead to a re-entrant phase diagram with the smectic-C sandwiching the smectic-A phase from both the high- and low-temperature sides. Simple entropy-energy arguments predict the shape of the re-entrant phase boundary.
PACS: 64.70.Md – Transitions in liquid crystals / 61.30.-v – Liquid crystals / 61.25.Hq – Macromolecular and polymer solutions; polymer melts
© EDP Sciences, 1996