Evaluation of the Polymer-Polymer Interaction Parameter from the Equation-of-State Thermodynamic Theory.

摘要

The strength of interaction between the segments of dissimilar components greatly influence the morphology of microdomains and hence the properties of polymer-polymer blends and block copolymers. In the theories of polymer-polymer interfaces dealing with such multicomponent systems, the interaction between components is usually expressed in terms of a single parameter which is independent of concentration. The validity of such an approximation is examined in this work in the light of the equation-of-state thermodynamic theory of polymer solutions and mixtures developed by Flory and coworkers. Using the molecular parameters evaluated by these workers, we have computed the free energy of mixing for the pairs, polyethylene/polyisobutylene, polyisobutylene/polystyrene and natural rubber/polystyrene.