抄録
We studied the influence of polymer molecular weight on the phase separation of a liquid crystal (LC) and a polymer. The critical temperature of the phase separation was increased according to the increase of the polymer molecular weight. The obtained critical temperatures were compared with the theoretical values calculated for Flory-Huggins free energy. As a result, it was clarified that parameter D, which means the molecular interaction between the LC and the polymer in Flory-Huggins interaction parameter_χ, increased with the increase of the polymer molecular weight. This result indicates that the large interaction between the LC and the polymer decreases, as the polymer molecular weight increases and the interaction is finally saturated. The change of the molecular interaction was also obtained by measuring the mixing enthalpy using differential scanning calorimeter.
