Thermodynamic Stability of Immiscible Polymer Blends
Macromolecules2000Vol. 33(10), pp. 3924–3931
Citations Over TimeTop 18% of 2000 papers
Abstract
Calculations based on an extended Flory−Huggins−Staverman model demonstrate that miscibility gaps in virtually immiscible blends may encompass a complex pattern of metastable and unstable equilibria that differ little in Gibbs free energy. Examples are given that demonstrate the development of near immiscibility by sideways coalescence of upper-critical and lower-critical gaps upon an increase of the chain lengths of the constituents. The mechanisms of merging are discussed, as well as the effect of chain-length distribution and copolymer composition. The conceivable occurrence of nonstable equilibria may lead to a change in physical properties of immiscible blends with time, here called thermodynamic aging of the second kind.
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