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Impact of Isotope Effects on the SANS Analysis of Amorphous Polymers

Published online by Cambridge University Press:  26 February 2011

F. S. Bates ,
W. C. Koehler ,
G. D. Wignall  and
L. J. Fetters
F. S. Bates
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974.
W. C. Koehler
Affiliation:
National Center for Small Angle Scattering Research, Oak Ridge National Laboratory, Oak Ridge, TN 37831.
G. D. Wignall
Affiliation:
National Center for Small Angle Scattering Research, Oak Ridge National Laboratory, Oak Ridge, TN 37831.
L. J. Fetters
Affiliation:
Exxon Research and Engineering Company Corporate Research – Science Laboratories, Annandale, NJ 08801.
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Abstract

Binary mixtures of the perdeuterated and protonated isotopes of four amorphous polymerspolystyrenes, 1,4-polybutadienes, 1,2-polybutadienes, and 1,2-polybutenes – have been examined by small-angle neutron scattering (SANS). In each case, evaluation of the SANS results based on the RPA theory of de Gennes indicates non-ideal mixing characterized by a Flory-Huggins interaction parameter 10-4 < χ 10-3. All four χ parameters can be closely predicted based on the measured change in the carbon-hydrogen bond polarizability with deuterium substitution. These findings are discussed in the context of past SANS studies of amorphous polymers.

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