Reorientation of carbon nanotubes in polymer matrix composites using compressive loading
| Autor: | David B. Geohegan, Ilia N. Ivanov, Michael J. Lance, Chun-Hway Hsueh |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Materials science Mechanical Engineering Mechanical properties of carbon nanotubes Polymer Carbon nanotube Epoxy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics law.invention Strain energy Condensed Matter::Soft Condensed Matter Stress (mechanics) Condensed Matter::Materials Science symbols.namesake chemistry Mechanics of Materials law visual_art symbols visual_art.visual_art_medium General Materials Science Compression (geology) Composite material Raman spectroscopy |
| Zdroj: | Journal of Materials Research. 20:1026-1032 |
| ISSN: | 2044-5326 0884-2914 |
| Popis: | Purified single-walled nanotubes (SWNTs) were dispersed in an epoxy polymer and subjected to uniaxial compressive loading. The orientation and stress in the nanotubes were monitored in situ using polarized Raman microscopy. At strains less than 2%, the nanotubes reorient normal to the direction of compression, thereby minimizing the local strain energy. Above 2% strain, the Raman peak shift reaches a plateau. A new analytical model, which approximates the SWNT reorientation by varying the aspect ratio of a representative spheroid, predicted the rotation behavior of nanotubes under load. The results of this model suggest that the observed plateau of the Raman peak shift is caused by both polymer yielding and interfacial debonding at the ends of nanotubes. |
| Databáze: | OpenAIRE |
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