We present a new mechanistic model for the self-similar propagation of case II sorption fronts of diluents into glassy polymers. The model not only presents a clear differentiation between the chemical-potential-induced driving forces and the material misfit-induced pressures that develop in the Fickian precursor field that counteract the driving forces but also set up conditions for visco-plastic extrusion of the diluentenriched polymer out of the surface or into a zone of rubbery gel behind the case-II process front. The quantitative predictions of the model are capable of giving accurate comparisons with experimental measurements, particularly with those of Kramer and co-workers on the penetration of iodoalkanes into polystyrene.
Посилання на статтю:
A mechanistic model of case II diffusion of a diluent into a glassy polymer / A.S. Argon, R.E. Cohen, A.C. Patel // Polymer. – 1999. – N 40. – P. 6991–7012.