On the Dynamics and Disentanglement in Thin and Two-Dimensional Polymer Films

Details On the Dynamics and Disentanglement in Thin and Two-Dimensional Polymer Films On the Dynamics and Disentanglement in Thin and Two-Dimensional Polymer Films

2006-09-06

arxiv.org/abs/cond-mat/0609127v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 3 figures, proceedings 3rd International Workshop on Dynamics in Confinement (CONFIT 2006)

Scientific paper

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 $t^{8/15}$ power law at intermediate times instead of the $t^{1/2}$ 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 $N_\mathrm{e}$ has been analyzed by a primitive path analysis. The analysis reveals that $N_\mathrm{e}$ increases strongly with decreasing film thickness.

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