Phase diagram of the third-generation liquid crystalline dendrimer-carbon tetrachloride system

The phase diagram of the third-generation liquid crystalline (LC) dendrimer -carbon tetrachloride system was obtained in the temperature-concentration coordinates over the temperature range 0-90 degreesC and dendrimer concentr ation range 1-55 wt % by the phase volume ratio technique. Three regions we re established on the diagram: the region of isotropic solution I at c < 1. 7 wt % and two miscibility gaps, phases I and II coexisting in the interval 1.7 < c < 36.5 wt % and phases II and III coexisting at 36.5 < c < 55 wt % ,Also the phase diagram of the system of interest resembles the known phase diagrams for LC polymer-low-molecular solvent systems, but it exhibits sub stantially different features: a wide concentration region of coexistence o f phases I and II, verticality of the boundaries of the region over the ent ire temperature range, and unusual supermolecular structure of phase II (no birefringent structures were detected in phase II by the technique of pola rizing microscopy): It was found that the process of separation of anisotro pic phase III is kinetically retarded and proceeds via the step of formatio n of the spherulitic LC phase.