The incompatibility of polystyrene (PS) and polyisobutylene (PIB) in toluene is characterized by binodals obtained from phase separation and spinodals obtained from light scattering at zero scattering angle. From these the interaction parameter χ 23 , between unlike polymer segments was calculated. It appears to be dependent on molecular weight and composition. The nature of χ 23 , especially its low value, is discussed.
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Esker et al. (1976) studied this question.
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