Abstract
The molecular weight dependence of the lower critical solution temperature of polystyrene (PS) and poly(vinyl methyl ether) blends was studied by laser light transmission. The temperature of phase separation was found to decrease with increasing PS molecular weight. In the steady shear flow conditions and near the critical temperature, shear was found to enhance fluctuations of concentration at relatively small shear rates, whereas it suppresses such fluctuations at high shear rates. The shift in Flory-interaction parameter Δχ was calculated from experimental data and its sign was used to predict shear-induced mixing or shear-induced demixing under flow field. The obtained experimental results were compared to Criado-Sancho et al. and Clarke-Mcleish models.
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