High performance polyurethane composites with isocyanate-functionalized carbon nanotubes: Improvements in tear strength and scratch hardness
| Autor: | Mayara C.G. Santos, Magnovaldo Carvalho Lopes, Rodrigo L. Lavall, Felipe Luiz Queiroz Ferreira, Glaura G. Silva, Hélio Ribeiro, Luciana M. Seara |
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| Rok vydání: | 2016 |
| Předmět: |
Tear resistance
Materials science Polymers and Plastics Polymer nanocomposite Scratch hardness 02 engineering and technology General Chemistry Carbon nanotube Nanoindentation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Isocyanate 0104 chemical sciences Surfaces Coatings and Films law.invention chemistry.chemical_compound chemistry law Materials Chemistry Surface modification Composite material 0210 nano-technology Polyurethane |
| Zdroj: | Journal of Applied Polymer Science. 134 |
| ISSN: | 0021-8995 |
| Popis: | A microwave-assisted functionalization of carbon nanotubes (CNTs) with isocyanate groups allowed a reduction of functionalization time from 24 h to 30 min with no change in the degree of functionalization or in the nanotube characteristics. Polymer nanocomposites with enhanced mechanical properties were obtained because of the tailored interface by the covalent linkage between the surface-modified multiwalled-carbon nanotubes (MWCNTs) and an elastomeric polyurethane (PUE) matrix. The mechanical data revealed that the composite containing 0.25 wt % of MWCNT-NCO showed an increase of 31% in tear strength and 28% in static toughness. A good adhesion between the matrix and individually dispersed nanotubes was observed in the scanning electron microscopy and transmission electron microscopy images. Nanoindentation and nanoscratch experiments were conducted to investigate the properties on the sub-surface. An increase by a factor of 3 in the scratch hardness was observed for the composite with 0.50 wt % of MWCNT-NCO with respect to the neat PUE. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44394. |
| Databáze: | OpenAIRE |
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