The influence of filler concentration on the phase separation temperature for the mixtures of two linear polymers has been investigated. Two mechanisms of the filler influence are established for various amounts of a filler. At a high filler content, when all polymers in the mixture are under the influence of solid, in the so-called state of border layer, the phase separation temperature increases as a result of changing the thermodynamic interaction parameters. At a small filler concentration, when only a part of polymers is in the border layer and other part is in bulk, the phase separation temperature diminishes sharply. This may be the result of the selective adsorption of low-molecular fractions on the filler surface.

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