Aggregation in solutions of polymer blends

Using capillary viscometry, the structuring of polymers, namely, poly(vinyl chloride) (PVC), PMMA. PP. P13. and polyisoprene, and their blends in chlorobenzene, o-dichlorobenzene, and cyclohexanone solutions was studied. It was shown that reversible aggregation processes take place even in highly dilute solutions at elevated temperatures. What all the blend systems have in common is that their tendency toward the Formation of mixed associates is the most pronounced at small concentrations of solutions. As the concentration is increased, the difference in the probabilities that difference kinds of associates (homo- or mixed) will form markedly levels off.