On the dynamics and disentanglement in thin and two-dimensional polymer films |
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Authors: | H Meyer T Kreer A Cavallo J P Wittmer J Baschnagel |
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Institution: | (1) Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg, France |
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Abstract: | We present results from molecular dynamics simulations of
strictly two-dimensional (2D) polymer melts and thin polymer films
in a slit geometry of thickness of the order of the radius of
gyration. We find that the dynamics of the 2D melt is qualitatively
different from that of the films. The 2D monomer mean-square
displacement shows a t8/15 power law at intermediate times
instead of the t1/2 law expected from Rouse theory for
nonentangled chains. In films of finite thickness, chain
entanglements may occur. The impact of confinement on the
entanglement length Ne has been analyzed by a primitive
path analysis. The analysis reveals that Ne increases
strongly with decreasing film thickness. |
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