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Brillouin Scattering from Gels

Published online by Cambridge University Press:  25 February 2011

F. Mallamace,
N. Micali,
C. Vasi,
F. Sciortino,
R. Bansil and
S. Pajevic
F. Mallamace
Affiliation:
Istituto Tecniche Spettroscopiche del C.N.R, Villagio S. Agata, Messina, 98166, ITALY
N. Micali
Affiliation:
Istituto Tecniche Spettroscopiche del C.N.R, Villagio S. Agata, Messina, 98166, ITALY
C. Vasi
Affiliation:
Istituto Tecniche Spettroscopiche del C.N.R, Villagio S. Agata, Messina, 98166, ITALY
F. Sciortino
Affiliation:
Center For Polymer Studies and Department of Physics Boston University, Boston, MA 02215, USA
R. Bansil
Affiliation:
Center For Polymer Studies and Department of Physics Boston University, Boston, MA 02215, USA
S. Pajevic
Affiliation:
Center For Polymer Studies and Department of Physics Boston University, Boston, MA 02215, USA
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Abstract

We have investigated the question of heterogeneity in gels using Brillouin scattering, depolarized Rayleigh scattering and dynamic light scattering measurements on methylmethacrylate (MMA) gels crosslinked with varying amount of ethylene-dimethacrylate (EDMA). We find that the k dependence of the phase velocity changes on increasing the cross-link content. For higher concentrations of crosslink we observe maxima and minima in the k dependence of the phase velocity which e associate with spatial inhomogeneities in the gel, with the formation of regions of low and high cross-link density, respectively. This micro-phase separation occurs around crosslink content of 3-4 %. At this same concentration depolarized Rayleigh measurements show a marked decrease in the number of MMA side groups capable of rotating.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991, 333
Copyright
Copyright © Materials Research Society 1992

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