Science (American Association for the Advancement of Science), 2001-04, Vol.292 (5515), p.255-258
2001
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Details
- Autor(en) / Beteiligte
- Titel
- Single-Molecule Studies of Heterogeneous Dynamics in Polymer Melts near the Glass Transition
- Ist Teil von
- Science (American Association for the Advancement of Science), 2001-04, Vol.292 (5515), p.255-258
- Ort / Verlag
- Washington, DC: American Society for the Advancement of Science
- Erscheinungsjahr
- 2001
- Quelle
- Science Magazine
- Beschreibungen/Notizen
- Single-molecule spectroscopy was used to follow the orientation of a single probe molecule in a polymer film in real time. Broad spatially heterogeneous dynamics were observed on long time scales, which result from simple diffusive rotational motions on short time scales. This diffusive behavior persists for many rotations before the molecule's local environment changes to one characterized by a new time scale. This environmental exchange occurs instantaneously on the time scale of the experiment and may arise from large-scale collective motions. The distribution of exchange times for these environments was measured for several temperatures near the glass transition.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0036-8075eISSN: 1095-9203DOI: 10.1126/science.1056430Titel-ID: cdi_proquest_miscellaneous_77056289
- Format
- –
- Schlagworte
- Applied sciences, Climate, Composition, Dichroism, Exact sciences and technology, Fluorescence, Glass, Glass & glassware industry, Lasers, Molecular dynamics, Molecular probes, Molecular rotation, Molecular spectroscopy, Molecules, Nucleation, Organic polymers, P values, Physicochemistry of polymers, Polymers, Properties and characterization, Rotational dynamics, Spectroscopy, Temperature, Thermal and thermodynamic properties