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Conformational Phase Transitions and Re-entrance Phenomena in Dendromesogens

May 9th, 2010

A. F. Terzis, A. G. Vanakaras and D.J. Photinos, Molec.Cryst. Liq. Cryst., 352, 699-708 (2000).

Abstract: We investigate theoretically the liquid crystalline phase behaviour of globular dendrimers consisting of a soft inner scaffold and peripheral mesogenic units attached to the scaffold by means of flexible chains. We use a generalised Onsager molecular theory to analyse model systems exhibiting conformational rod-sphere and rod-disc interconversions. Phase transitions normally not encountered in low molar mass mesogens are reported. For a system with spherical lowest energy conformation a thermotropic re-entrance to the isotropic phase is observed.

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