Influence of chain length on the interface width of an incompatible polymer blend
Max-Planck-Institut für Polymerforschung - Postfach 3148, 55021
Accepted: 26 June 1996
The interface width between polystyrene and poly-(methyl methacrylate) has been determined by neutron reflectometry as a function of molecular weight. It changes with molecular weight between and in the investigated range. The molecular-weight dependence is consistent with a mean-field theoretical description of the interface width of incompatible polymer blends. The determination of the interface width between incompatible polymers thus provides a means to obtain accurately the segment interaction parameter for polymer blend systems, which are otherwise difficult to determine. Results are compared with other experiments for this blend system.
PACS: 36.20.Cw – Molecular weights, dispersity / 61.12.Ex – Neutron scattering techniques (including small-angle scattering) / 82.65.Dp – Thermodynamics of surfaces and interfaces
© EDP Sciences, 1996