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Phase Separation In Blends of Polystyrene and Poly(P-METHYLSTYRENE) Using Thermal Analysis And Small-Angle NeutronScattering

Published online by Cambridge University Press:  15 February 2011

A. Xenopoulos ,
J. D. Londono ,
G. D. Wígnall  and
B. Wunderlich
A. Xenopoulos
Affiliation:
Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600
J. D. Londono
Affiliation:
Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600
G. D. Wígnall
Affiliation:
Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600
B. Wunderlich
Affiliation:
Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600
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Abstract

Differential scanning calorimetry (DSC) was used to study blends ofpolystyrene (PS) and poly (p-Methylstyrene) (PpmS). The presence of twoglass transitions on heating after quenching was interpreted as evidence ofphase separation at the temperature of the liquid before quenching. Thesmall difference between the glass transitions of the homopolymers in thePS/PpmS system of “13 K limits the reliable detection of double glasstransitions for blends to concentrations between 30 and 70%. The results ofthe DSC technique are supported by comparison with small angle neutronscattering (SANS) data.

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References

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