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The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber

1
Leibniz-Institut für Polymerforschung Dresden, 01069 Dresden, Germany
2
Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 294; https://doi.org/10.3390/cryst9060294
Received: 20 April 2019 / Revised: 14 May 2019 / Accepted: 2 June 2019 / Published: 5 June 2019
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Abstract

Vulcanized natural rubber (unfilled and filled with 20 phr carbon black) is strained. We suppress the macroscopic formation of fiber symmetry by choosing strip-shaped samples ("pure-shear geometry") and investigate the orientation of the resulting crystallites by two-dimensional wide-angle X-ray diffraction (WAXD), additionally rotating the sample tape about the straining direction. Indications of a directed reinforcing effect of the strain-induced crystallization (SIC) in the thin strip are found. In the filled material fewer crystallites are oriented and the orientation distribution of the oriented crystallites is less perfect. The results confirm, that it is important for the evaluation of crystallinity under deformation to check, whether fiber symmetry can be assumed. This has consequences in particular on the quantitative interpretation of space-resolved scanning experiments in the vicinity of crack tips. Furthermore it raises the question, whether there is an asymmetric reinforcing effect of the SIC in the vicinity of crack tips inside natural rubber. View Full-Text
Keywords: strain-induced crystallization; pure-shear sample; crystallite orientation; synchrotron X-ray scattering strain-induced crystallization; pure-shear sample; crystallite orientation; synchrotron X-ray scattering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Schneider, K.; Schwartzkopf, M. The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber. Crystals 2019, 9, 294.

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