Volume 46, Number 4, May II 1999
|Page(s)||472 - 478|
|Section||Electromagnetism, optics, acoustic, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 September 2002|
Modes of deformation in a soft/hard nanocomposite: A SANS study
Laboratoire Léon Brillouin, CEA-Saclay - 91191
Gif sur Yvette, France
2 Laboratoire PMMH, ESPCI - 10 rue Vauquelin, 75231 Paris cedex 05, France
3 Rhône Poulenc - 93308 Aubervilliers, France
Accepted: 26 February 1999
Nanocomposites have been made by mixing soft particles (polymer latex) with hard particles (silica) in aqueous dispersions and extracting water to produce a dense film. Segregation between the two kinds of particles can be controlled, and even suppressed. The elongational modulus is strongly increased by such fillers at low deformations, and remains important at large deformations, which the samples can stand without breaking. Since the silica particles are small (200 Å), we can follow their relative displacements under stretching, by Small-Angle Neutron Scattering, through analysis and simulation of the anisotropic patterns. The latter show a crossover from affine displacements to a set of shear displacements that let the particles avoid each other at large deformations. The shear could release the localized stresses (due to polymer confinement) and dissipate more energy. In this way it may contribute to the toughness of the composite against crack propagation.
PACS: 46.35.+z – Viscoelasticity, plasticity, viscoplasticity / 46.50.+a – Fracture mechanics, fatigue and cracks / 61.12.Ex – Neutron scattering techniques (including small-angle scattering)
© EDP Sciences, 1999
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