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Small Angle Neutron Scattering Investigation of Paraffin Solid Solutions Undergoing Microphase Separation

Published online by Cambridge University Press:  26 February 2011

J. E. Epperson ,
J. W. White  and
D. G. Wozniakt
J. E. Epperson
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
J. W. White
Affiliation:
Research School of Chemistry, Australian National University, GPO Box 4, Canberra, ACT, Australia
D. G. Wozniakt
Affiliation:
Intense Pulsed Neutron Source Division, Argonne National Laboratory, Argonne, IL 60439, USA
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Abstract

We show that small angle neutron scattering can sensitively detect microphase separation in solid solutions of the C30H62:C36D74 mixed paraffins. By ramping the sample temperature at a constant rate of about 0.5°C per minute, information complementary to that from differential heat capacity measurements is obtained from the total small angle scattering signal and its first temperature derivative. Because neutron wavelengths in the range from 0.8 < λ (Å) < 14.0 are used, scattering functions over an extended range (0.005 < q (Å−1) < 0.35) are obtained at the Argonne pulsed neutron source in a single experiment. This is important inasmuch as there is significant scattering in the lowest q region accessible due to the presence of cracks and/or voids, in addition to that from the microphase separation. The specific interfacial area as a function of temperature is reported from time slicing experiments on the pure C36D74 compound. Weak superlattice reflections are identifiable in the scattering profiles of the mixed paraffins due to the microphase separation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 159
Copyright
Copyright © Materials Research Society 1992

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