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Phase continuity and inversion in polymer blends and simultaneous interpenetrating networks
Author(s) -
Jordhamo G. M.,
Manson J. A.,
Sperling L. H.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260802
Subject(s) - materials science , polystyrene , phase inversion , polybutadiene , rheology , polymer , composite material , phase (matter) , volume fraction , polyester , inversion (geology) , thermodynamics , polymer chemistry , copolymer , organic chemistry , chemistry , paleontology , biochemistry , physics , structural basin , membrane , biology
Abstract A semi‐empirical expression for predicting phase continuity and inversion in polymer blends and simultaneous interpenetrating networks (SINs) was developed and examined experimentally. A rheological model based on the volume fraction, ϕ, and viscosity, η, led to the equation\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{{\rm \eta }_{\rm 1} }}{{{\rm \eta }_{\rm 2} }} \cdot \frac{{\phi _{\rm 2} }}{{\phi _{\rm 1} }} \cong 1 $$\end{document} as the criteria for dual phase continuity for phases 1 and 2. This relation was evaluated for two systems: a castor oil polyester‐urethane/polystyrene SIN, and a mechanical blend of polystyrene and polybutadiene. Literature data was also examined. A gradual phase inversion was found, with a region of dual phase continuity in between. While predictions of phase continuity were confirmed for the mechanical blends, they were not confirmed for the SIN system. This was probably due to rapid gelation at the point of phase inversion.