Chain Dynamics of Ultrahigh Molecular Weight Polyethylene Composites with Graphene Oxide Nanosheets
| Autor: | Ingo Hoffmann, Sylvain Prévost, Ignacio Martín-Fabiani, Stavros X. Drakopoulos, Giuseppe Forte, Sara Ronca |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Graphene Organic Chemistry Oxide 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Neutron spin echo Inorganic Chemistry chemistry.chemical_compound chemistry Rheology law Materials Chemistry Composite material 0210 nano-technology Spectroscopy Nanoscopic scale Layer (electronics) |
| Zdroj: | ACS macro letters. 10(4) |
| ISSN: | 2161-1653 |
| Popis: | We investigate the melt chain dynamics of ultrahigh molecular weight polyethylene (UHMWPE) and its composites with graphene oxide (GO) nanosheets by means of neutron spin echo spectroscopy. For the GO concentrations explored, we observe hindered chain dynamics with respect to the pure UHMWPE. We propose a model where a fraction of the polymer is immobilized on top and at the bottom of GO sheets. This model enables us to provide a microscopic measurement of the adsorbed and free polymer fractions, as well as the thickness of the adsorbed layer. Our experiments provide experimental nanoscopic evidence of GO hindering entanglement formation in a polymer melt, a phenomenon that had been observed at the macroscale before via rheological measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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