J. Phys. IV France 03 (1993) C8-17-C8-20
Pressure dependence of the Flory-Huggins interaction parameter in binary polymer blends investigated by SANSS. JANSSEN1, D. SCHWAHN1, K. MORTENSEN2 and T. SPRINGER1
1 Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, Postfach 1913, 5170 Jülich, Germany
2 Risø National Laboratory, 4000 Roskilde, Denmark
The pressure dependence of the Flory - Huggins interaction parameter of two binary polymer blends was investigated by small angle neutron scattering (SANS). We studied the polymer blends deutero - Polystyrene / Polyvinylmethylether (d - PS / PVME) and deutero - Polystyrene / Polyphenylmethylsiloxane (d - PS / PPMS), exhibiting decomposition at high and at low temperatures, respectively. In both cases the enthalpic contribution of the Flory - Huggins parameter is not affected by pressure in the investigated pressure range between 1 and 1200 bars, whereas the absolute value of the entropic contribution is generally a decreasing function of pressure.
© EDP Sciences 1993