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Studies on the Excess Free Energy and The Early Spinodal Decomposition of the Blend d-PS/Peavrmley Asntda tteh Eof Isotopic Blend d-PS/PS with Small Angle Neutron Scattering

Published online by Cambridge University Press:  21 February 2011

D. Schwahn ,
T. Springer ,
K. Hahn  and
J. Streib
D. Schwahn
Affiliation:
Institut für Festköperforschung der Kernforschungsanlage Jülich GmbH, Postfach 1913, D—5170 Jülich, Federal Republic of, Germany
T. Springer
Affiliation:
Institut für Festköperforschung der Kernforschungsanlage Jülich GmbH, Postfach 1913, D—5170 Jülich, Federal Republic of, Germany
K. Hahn
Affiliation:
BASF Aktiengesellschaft, D—6700 Ludwigshafen, Federal Republic of, Germany
J. Streib
Affiliation:
BASF Aktiengesellschaft, D—6700 Ludwigshafen, Federal Republic of, Germany
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Extract

The article deals with the phase diagram and spinodal decomposition of two polymers blends, namely d—PS/PVME and d(deutero)—PS/PS, investigated by small angle neutron scattering (SANS). The result of the static experiments is the excess free energy and the phase diagram. This is used as a basis for studies of non—equilibrium phenomena as spinodal decomposition. In polymer blends the Cahn—Hilliard—Cook theory of the early state of spinodal decomposition can be tested easily, because the blends have rather low relaxation rates; and they are meanfield systems [2,6] which makes interpretation simple, except in a very narrow temperature region near the critical point [6]. The kinetics in the isotopic blend d—PS/PS are so slow that the early states of spinodal decomposition can be studied within minutes. The presented SANS results have been performed at the KWS I small angle instrument at the FRJ—2 reactor in the KFA Jülich.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 171: Symposium O – Polymer Based Molecular Composites , 1989 , 261
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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