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Mobility and the Glass Transition in Mixed Polymer-Diluent Glasses by NMR

Published online by Cambridge University Press:  16 February 2011

Alan A. Jones ,
Paul T. Inglefield ,
Yu Liu ,
Bonnie Cauley ,
Ajoy K. Roy  and
Roger Kambour
Alan A. Jones
Affiliation:
Department of Chemistry, Clark University, Worcester, MA
Paul T. Inglefield
Affiliation:
Department of Chemistry, Clark University, Worcester, MA
Yu Liu
Affiliation:
Department of Chemistry, Clark University, Worcester, MA
Bonnie Cauley
Affiliation:
Department of Chemistry, Clark University, Worcester, MA
Ajoy K. Roy
Affiliation:
Department of Chemistry, Clark University, Worcester, MA
Roger Kambour
Affiliation:
Polymer Physics and Engineering, General Electric Central Research and Development, Schenectady, NY
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Abstract

Phosphorous and proton line shape studies of a trioctyl phosphate diluent in polycarbonate and in a fifty-fifty blend of polystyrene with polyphenylene oxide have been performed to monitor diluent dynamics. Both the phosphorous and proton line shapes are superficially bimodal with a narrow, mobile component of the line shape appearing at temperatures well below the thermal glass transition temperatures. Plots of the h.ction of mobile material versus temperature show two step increases separated by a plateau region. This behavior is analyzed in terms of a distribution of activation energies which results in a bimodal description. The bimodal activation energy distribution corresponds to a bimodal correlation time distribution. The more mobile material is identified with diluent molecules in contact with other diluent molecules in a lattice description which assumes a single phase system is assumed with a purely random distribution of diluent and polymer on the lattice.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 215: Symposium R2 – Structure, Relaxation and Physical Aging of Glassy Polymers , 1990 , 109
Copyright
Copyright © Materials Research Society 1991

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