Mobility of spin labelled poly(ethylene oxide) chains grafted on silica |
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| Authors: | H. Hommel A.P. Legrand J. Lecourtier J. Desbarres |
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| Affiliation: | 1. Laboratoire de Physique Quantique, Equipe de Recherche Associée au C.N.R.S. No. 676, Paris Cedex 05, France;2. Laboratoire de Physico-Chimie Macromoléculaire de l''Université Pierre et Marie CURIE, Associé au C.N.R.S. No. 278 Paris Cedex 05, France;3. Laboratoire de Chimie Analytique, Associé au C.N.R.S. No. 28 10, Rue Vauquelin 75231, Paris Cedex 05, France |
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| Abstract: | Samples of spin labelled poly(ethylene oxide) of average molecular weight 6000 and 400, grafted to extents of 20% and 15% by weight on silica gel, have been examined at various temperatures. EPR measurements at X-band frequency showed composite spectra, characteristic of two mobility states. A thermally activated process has been demonstrated. A two layer model is proposed. |
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