Two cases of segregation of the different polymers from
The simulation of segregation of two polymers near an interface their mixture in the molten state can be distinguished. In has been realized by studying adsorption from concentrated soluthe first case, segregation proceeds from a one-phase melt tions of incompatible polymers at concentrations above that for (components miscible in the molten state at a given temperacoil overlapping and corresponding to one-phase and two-phase ture), segregation is one of the cases of adsorption of a states. For solutions that have separated into two phases with polymeric component in solution in another. For this case, increasing component concentration, the adsorption from each competitive adsorption is typical, with preferential adsorpphase has been studied separately and the total adsorption from tion of one of the components.
two phases has been calculated. The polystyrene-poly(butyl
The second, more complex case is that of segregation methacrylate) -CCl 4 system was investigated using fumed silica as adsorbent. Simultaneously the fraction of segments of each type from a two-phase melt. This case should be more important, immobilized by the surface was determined from NMR spectra. In as the majority of polymer pairs have lower critical solution all cases, poly(butyl methacrylate) is characterized by preferential temperatures (LCST) and their melts should be characteradsorption. The main features of adsorption are similar in both ized by the lack of miscibility of components. In such a one-phase and two-phase states; however, the values of adsorption system each phase, according to the phase diagram, repreand fraction of immobilized segments are different for adsorption sents a solution of one component in another, the composifrom two separated phases because of the difference in the ratio tions and phase ratio being dependent on the position of of components and their concentration in each phase. The total the figurative point on the phase diagram in concentration adsorption of poly(butyl methacrylate) from the two-phase state temperature coordinates. Here each phase may indepenis higher than from the one-phase state. It is concluded that in dently interact with the surface and surface segregation may two-phase systems adsorption proceeds simultaneously from both occur separately from each phase (5).
phases, leading to higher segregation of one of the components.