Dynamics of polystyrene probed by muon spin spectroscopy
| Autor: | Iain McKenzie, Joseph Cannon, Danaan Cordoni-Jordan, Stephen P. Cottrell |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Radical Relaxation (NMR) Muonium Dynamics (mechanics) Analytical chemistry 02 engineering and technology Activation energy Muon spin spectroscopy 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences chemistry.chemical_compound chemistry 0103 physical sciences General Materials Science Polystyrene 010306 general physics 0210 nano-technology Glass transition |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 33(6) |
| ISSN: | 1361-648X |
| Popis: | Muon spin spectroscopic measurements were made on atactic low-molecular-weight (LMW) (1.3 kg mol−1) and high-molecular-weight (HMW) (202 kg mol−1) polystyrene. Muoniated cyclohexadienyl radicals, which are formed by muonium addition to the phenyl side groups, are used as local probes of bulk dynamics. Muon spin relaxation is caused by the secondary γ-relaxation process, which involves motion of the phenyl rings, and is sensitive to the glass transition. The activation energy of the γ-relaxation process in the rubbery state is 0.60(2) eV in the HMW sample and 0.37(3) eV in the LMW sample. |
| Databáze: | OpenAIRE |
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