The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/9/6/294 |
| _version_ | 1828363861550432256 |
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| author | Konrad Schneider Matthias Schwartzkopf |
| author_facet | Konrad Schneider Matthias Schwartzkopf |
| author_sort | Konrad Schneider |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-14T05:07:03Z |
| format | Article |
| id | doaj.art-ed591d4390734328ae71cfa42dc6b823 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-14T05:07:03Z |
| publishDate | 2019-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-ed591d4390734328ae71cfa42dc6b8232022-12-22T02:10:40ZengMDPI AGCrystals2073-43522019-06-019629410.3390/cryst9060294cryst9060294The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural RubberKonrad Schneider0Matthias Schwartzkopf1Leibniz-Institut für Polymerforschung Dresden, 01069 Dresden, GermanyDeutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, GermanyVulcanized 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.https://www.mdpi.com/2073-4352/9/6/294strain-induced crystallizationpure-shear samplecrystallite orientationsynchrotron X-ray scattering |
| spellingShingle | Konrad Schneider Matthias Schwartzkopf The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber Crystals strain-induced crystallization pure-shear sample crystallite orientation synchrotron X-ray scattering |
| title | The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber |
| title_full | The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber |
| title_fullStr | The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber |
| title_full_unstemmed | The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber |
| title_short | The Orientation of Strain-Induced Crystallites in Uniaxially-Strained, Thin and Wide Bands Made from Natural Rubber |
| title_sort | orientation of strain induced crystallites in uniaxially strained thin and wide bands made from natural rubber |
| topic | strain-induced crystallization pure-shear sample crystallite orientation synchrotron X-ray scattering |
| url | https://www.mdpi.com/2073-4352/9/6/294 |
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