Slow dynamics in a model of the cellulose network

Details Slow dynamics in a model of the cellulose network Slow dynamics in a model of the cellulose network

2007-06-07

arxiv.org/abs/0706.0997v1

Polymer 48, 4849 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages, 7 figures, accepted in Polymer

Scientific paper

We present numerical simulations of a model of cellulose consisting of long stiff rods, representing cellulose microfibrils, connected by stretchable crosslinks, representing xyloglucan molecules, hydrogen bonded to the microfibrils. Within a broad range of temperature the competing interactions in the resulting network give rise to a slow glassy dynamics. In particular, the structural relaxation described by orientational correlation functions shows a logarithmic time dependence. The glassy dynamics is found to be due to the frustration introduced by the network of xyloglucan molecules. Weakening of interactions between rod and xyloglucan molecules results in a more marked reorientation of cellulose microfibrils, suggesting a possible mechanism to modify the dynamics of the plant cell wall.

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