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Nuclear Reaction Analysis Studies on the Interface Formation in Polymer Mixtures

Published online by Cambridge University Press:  21 February 2011

Ullrich Steiner ,
Kumar Chaturvedi ,
Omer Zak ,
Georg Krausch ,
Günther Schatz  and
Jacob Klein
Ullrich Steiner
Affiliation:
Department of Polymer Research, Weizmann Institute, Rehovot 76100, Israel.
Kumar Chaturvedi
Affiliation:
Department of Polymer Research, Weizmann Institute, Rehovot 76100, Israel.
Omer Zak
Affiliation:
Department of Polymer Research, Weizmann Institute, Rehovot 76100, Israel.
Georg Krausch
Affiliation:
Department of Polymer Research, Weizmann Institute, Rehovot 76100, Israel.
Günther Schatz
Affiliation:
Department of Polymer Research, Weizmann Institute, Rehovot 76100, Israel.
Jacob Klein
Affiliation:
Department of Polymer Research, Weizmann Institute, Rehovot 76100, Israel.
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Abstract

We have measured the composition profile between two polymer phases above and below their critical temperature for phase separation Tc, using the 2H(3He,4He)1H nuclear reaction in a direct profiling technique. Above Tc, we verify the “thtrmodynamic slowing down” effects on interdiffusion close to the critical point. Pelow Tc, we find that the width of the interface grows with time to a finite limiting value. The variation of this limiting value, as Tc, is approached from below is in good agreement with the predictions of mean-field theories. The time dependence of the initial interfacial broadening below Tc has been found to be significantly slower than t1/2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 177: Symposium V – Macromolecular Liquids , 1989 , 367
Copyright
Copyright © Materials Research Society 1990

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References

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