V. K. Gerasimov2, A. E. Chalykh, and A. Avgonov
Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
Received June 10, 2002;
Revised Manuscript Received October 19, 2002
Abstract—Phase diagrams of systems composed of PDMS and cyclolinear poly(siloxanes) with varying
molecular masses were constructed using the optical interferometry method. It was shown that, above the
isotropization temperature, all the tested systems are fully miscible. The effect of the molecular mass of PDMS
on a depression in the isotropization temperature of LC polymers was ascertained. The curves of mesomorphic
phase swelling were first obtained on phase diagrams below the isotropization temperature. It was demonstrated
that the thermodynamic analysis of phase diagrams can be performed within the framework of the classical
Flory–Huggins theory. The pair interaction parameters were determined, the distances between the junctions of
a physical network in the anisotropic state of LC polymers were estimated, and the influence of the structural
factor on the isotropization temperature depression was assessed. Based on the experimental temperature
dependences of the pair interaction parameter, the generalized phase diagram of a PDMS–cyclolinear
poly(organosiloxane) system was derived.
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