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Butterfly Patterns: an Anomaly Common to the Neutron Scattering Spectra of Elongated Rubbers, Melts and Gels:

Published online by Cambridge University Press:  25 February 2011

J. Bastide ,
F. Boue ,
R. Oeser ,
E. Mendes ,
F. Zielinski ,
M. Buzier ,
C. Lartigue  and
P. Lindner
J. Bastide
Affiliation:
Institut Charles Sadron, 6, rue Boussingault F-67083 Strasbourg Cedex France
F. Boue
Affiliation:
Laboratoire Leon Brillouin, CEN Saclay, F-91191 Gif sur Yvette Cedex France
R. Oeser
Affiliation:
Institut Laue Langevin, BP 156X, F-38042 Grenoble Cedex France
E. Mendes
Affiliation:
Institut Charles Sadron, 6, rue Boussingault F-67083 Strasbourg Cedex France
F. Zielinski
Affiliation:
Laboratoire Leon Brillouin, CEN Saclay, F-91191 Gif sur Yvette Cedex France
M. Buzier
Affiliation:
Laboratoire Leon Brillouin, CEN Saclay, F-91191 Gif sur Yvette Cedex France
C. Lartigue
Affiliation:
Laboratoire Leon Brillouin, CEN Saclay, F-91191 Gif sur Yvette Cedex France
P. Lindner
Affiliation:
Institut Laue Langevin, BP 156X, F-38042 Grenoble Cedex France
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Abstract

A totally unexpected phenomenon has been observed for the first time a few years ago when studying, by small angle neutron scattering, rubbery networks containing a small proportion of uncrosslinked labelled (deuterated) chains [1].When such a system is elongated, the scattered intensity strongly increases with the extension ratio λ for q vectors parallel to the stretching direction (and for low q values). Conversely, in the direction perpendicular to the elongation axis, the scattered intensity slightly decreases at low q for small extension ratios and then remains approximately constant when λ is further increased. The changes which are observed occur therefore in a direction opposite to the “conventional” one, i.e. that corresponding to chains effectively linked by at least two chemical junctions to the network and thus oriented on an average along the direction of stretching.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 313
Copyright
Copyright © Materials Research Society 1992

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References

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