SHORT TIME AND STRUCTURAL DYNAMICS IN POLYPROPYLENE GLYCOL NANOCOMPOSITE
| Autor: | Madhusudan Tyagi, R. Casalini, C. M. Roland |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Nanocomposite Materials science Polymers and Plastics Physics::Optics 02 engineering and technology Polymer Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Polypropylene glycol chemistry Materials Chemistry Particle Relaxation (physics) Composite material 0210 nano-technology Glass transition |
| Zdroj: | Rubber Chemistry and Technology. 90:264-271 |
| ISSN: | 1943-4804 0035-9475 |
| DOI: | 10.5254/rct.17.82664 |
| Popis: | The dynamics of polypropylene glycol, both neat and attached to silica nanoparticles, were investigated using elastic neutron backscattering and dielectric spectroscopy. The mean square displacement measured by the former is suppressed by the particles at temperatures corresponding to a dielectric secondary relaxation (that involves only a portion of the repeat unit) and the segmental relaxation (glass transition). Despite the suppression of the displacements, the motions are faster in the nanocomposite, primarily due to poorer packing (lower density) at the particle interface. At very low temperatures we discovered a new dynamic process in the polymer. Reflecting its very local nature, this process is unaffected by attachment of the chains to the silica. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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