Numéro
J. Phys. IV France
Volume 03, Numéro C8, Décembre 1993
IX International Conference on Small Angle Scattering
Page(s) C8-13 - C8-16
DOI http://dx.doi.org/10.1051/jp4:1993802
IX International Conference on Small Angle Scattering

J. Phys. IV France 03 (1993) C8-13-C8-16

DOI: 10.1051/jp4:1993802

Observation of internal relaxation modes during early state of spinodal decomposition in the isotopic polymer mixture d-PS/PS with SANS

D. SCHWAHN1, H. ECKERLEBE2, E . HÄDICKE3 and T. SPRINGER1

1  Forschungszentrum Jülich GmbH, Institut für Festköperforschung, 5170 Jülich, Germany
2  GKSS Forschungszentrum Geesthacht, 2054 Geesthacht, Germany
3  BASF AG, 6700 Ludwigshafen, Germany


Abstract
Early state of spinodal decomposition in a symmetric isotrope mixture d-PS/PS has been studied with SANS at two temperatures well below Tc. Nonexponential time behaviour was found according to internal relaxation modes of the polymer. The data could satisfactorily be described by an ansatz from Akcasu which includes internal relaxation modes approximately and is an extension of the Cahn-Hilliard-Cook theory for polymer blends. The interaction range for the Onsager coefficient was found increasing with time and larger than the radius of gyration



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