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Structure Pinning During Phase-Separation of Polyamide/Ionomer Blends

Published online by Cambridge University Press:  10 February 2011

R. A. Weiss ,
Y. Feng ,
R. Tucker ,
R. Xie ,
C. C. Han  and
A. Karim
R. A. Weiss
Affiliation:
Dept. of Chemical Engineering and Polymer Science Program, University of Connecticut, Storrs, CT 06269–3136
Y. Feng
Affiliation:
Dept. of Chemical Engineering and Polymer Science Program, University of Connecticut, Storrs, CT 06269–3136
R. Tucker
Affiliation:
Dept. of Chemical Engineering and Polymer Science Program, University of Connecticut, Storrs, CT 06269–3136
R. Xie
Affiliation:
Dept. of Chemical Engineering and Polymer Science Program, University of Connecticut, Storrs, CT 06269–3136
C. C. Han
Affiliation:
Polymer Section, National Institute of Standards and Technology, Gaithersburg, MD 20899
A. Karim
Affiliation:
Polymer Section, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

Blends of lightly sulfonated polystyrene and poly(N,N'-dimethylethylene sebacamide) (Li-SPS/mPA) are miscible as a result of strong ion-amide complexation. The blends exhibit LCST phase behavior and an increase of the sulfonation level from 4 to 9.5 mol% raises the critical temperature by 150°C. Phase separation may be thermally induced and isthermodynamically reversible. The phase separation kinetics that occur following a temperature-jump deep into the spinodal region of the phase diagram deviate from conventional Cahn-Hilliard theory and the phase separation process stalls after a couple of hours, essentially pinning the structure at that point. The extent of phase-separation that occurs before pinning is temperature-dependent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 461: Symposia BB – Morphological Control in Multiphase Polymer Mix… , 1996 , 3
Copyright
Copyright © Materials Research Society 1997

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References

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