| Autor: |
Paul Denner, Theo Willing, Bernd Walter |
| Rok vydání: |
1997 |
| Předmět: |
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| Zdroj: |
Macromolecular Symposia. 119:339-352 |
| ISSN: |
1022-1360 |
| Popis: |
Proton spin relaxation measurements have been used to investigate the effect of aging on local and coherent segmental dynamics in cis-1,4-polybutadiene samples. The polymer chains in bulk polybutadiene were crosslinked by exposure to ionizing radiation. The transition of the 1 H-n.m.r, signal from a liquidlike spin system response to a solidlike one is due to crosslinking and network formation by the irradiation and depends on the radiation dose. It is shown that the radiation yields changes in the constrained defect diffusion processes modelling the chain dynamics. Correlation time and memory time for the local and coherent segmental motion strongly depend on radiation dose. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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