Polymer melts confined in micrometer thick layers were examined with the aid of field-cycling NMR relaxometry. It is shown that chain dynamics under such moderate confinement conditions are perceptibly different from those observed in the bulk material. This is considered to be a consequence of the corset effect, which predicts a crossover between Rouse and reptationlike dynamics for molecular weights below the critical value at confinement length scales much larger than , where is the Flory radius of the bulk polymer coil [Fatkullin et al, New J. Phys. 6, 46 (2004)]. For the polymer species studied, a perfluoropolyether with a molecular weight of 11 000, the Flory radius is of the order , so that the experiment refers to the far end of the predicted crossover region from confined to bulk chain dynamics. Remarkably the confinement effect is shown to reach polymer-wall distances of the order 100 Flory radii.
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21 March 2006
Research Article|
March 20 2006
Confinement effect of chain dynamics in micrometer thick layers of a polymer melt below the critical molecular weight
Ravinath Kausik;
Ravinath Kausik
Sektion Kernresonanzspektroskopie,
Universität Ulm
, 89069 Ulm, Germany
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Carlos Mattea;
Carlos Mattea
Sektion Kernresonanzspektroskopie,
Universität Ulm
, 89069 Ulm, Germany
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Nail Fatkullin;
Nail Fatkullin
Department of Molecular Physics,
Kazan State University
, 420008 Kazan, Tatarstan, Russia
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Rainer Kimmich
Rainer Kimmich
a)
Sektion Kernresonanzspektroskopie,
Universität Ulm
, 89069 Ulm, Germany
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a)
Electronic mail: rainer.kimmich@uni-ulm.de
J. Chem. Phys. 124, 114903 (2006)
Article history
Received:
December 05 2005
Accepted:
January 24 2006
Citation
Ravinath Kausik, Carlos Mattea, Nail Fatkullin, Rainer Kimmich; Confinement effect of chain dynamics in micrometer thick layers of a polymer melt below the critical molecular weight. J. Chem. Phys. 21 March 2006; 124 (11): 114903. https://doi.org/10.1063/1.2177246
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