Pressure dependence of the Flory-Huggins interaction parameter in binary polymer blends investigated by SANS

S. JANSSEN; D. SCHWAHN; K. MORTENSEN; T. SPRINGER

doi:doi:10.1051/jp4:1993803

Numéro		J. Phys. IV France Volume 03, Numéro C8, Décembre 1993 IX International Conference on Small Angle Scattering


Page(s)		C8-17 - C8-20
DOI		https://doi.org/10.1051/jp4:1993803

IX International Conference on Small Angle Scattering

J. Phys. IV France 03 (1993) C8-17-C8-20
DOI: 10.1051/jp4:1993803

Pressure dependence of the Flory-Huggins interaction parameter in binary polymer blends investigated by SANS

S. 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

Abstract
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.