Strain induced anisotropies in silica polydimethylsiloxane composites

The Journal of Chemical Physics
Gerald Johannes Schneider, D Göritz

Abstract

Structural changes of silica in polydimethylsiloxane rubber induced by external forces were studied by means of small-angle X-ray scattering experiments. The silica fraction varies from 9 up to 23 vol% and the elongation ratio from 1 to 3. Within the q-range of 0.02 nm(-1)<q<1 nm(-1) the primary particles and the clusters which consist of these basic units could be resolved. The scattering diagrams of the samples without external deformation are radially symmetric and, in particular, the mass fractal dimension does not depend on the silica fraction. Due to the deformation the contours of the two-dimensional scattering diagrams become elliptic. A model independent analysis of the intensity as a function of the q-vector perpendicular and parallel to the deformation axis revealed that the microscopic cluster size is systematically increased by the macroscopic external deformation. In particular, the deformation ratio at the microscopic and the macroscopic length scale is very similar. The mass fractal dimension, as obtained by the slope of the scattering curve, increases significantly with growing deformation ratio, but is the same in vertical and horizontal directions. A simple relation derived for the crossover from self-similar...Continue Reading

References

Sep 1, 1997·Journal of Colloid and Interface Science·C Oh, C M Sorensen
Apr 20, 2002·Science·T C MerkelA J Hill
Mar 25, 2006·Science·Michael E MackayR S Krishnan
Jun 29, 2006·Physical Review Letters·Reghan J Hill
Nov 30, 2007·The Journal of Physical Chemistry. B·Jan KruseMatthias Wessling
Jun 25, 2009·The Journal of Chemical Physics·Gerald Johannes Schneider

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Citations

Sep 14, 2010·The Journal of Chemical Physics·Gerald Johannes SchneiderD Göritz
Feb 3, 2018·The Review of Scientific Instruments·Sudipta GuptaGerald J Schneider
Jan 24, 2020·ACS Applied Materials & Interfaces·Junpyo KwonTing Xu

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Methods Mentioned

BETA
small-angle neutron scattering
X-ray

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