From thermally activated to viscosity controlled fracture of biopolymer hydrogels

Details From thermally activated to viscosity controlled fracture of biopolymer hydrogels From thermally activated to viscosity controlled fracture of biopolymer hydrogels

2008-10-22

arxiv.org/abs/0810.4082v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1063/1.3078267

We report on rate-dependent fracture energy measurements over three decades of steady crack velocities in alginate and gelatin hydrogels. We evidence that, irrespective of gel thermo-reversibility, thermally activated "unzipping" of the non-covalent cross-link zones results in slow crack propagation, prevaling against the toughening effect of viscous solvent drag during chain pull-out, which becomes efficient above a few mm.s$^{-1}$. We extend a previous model [Baumberger {\it et al.} Nature Materials, {\bf 5}, 552 (2006)] to account for both mechanisms, and estimate the microscopic unzipping rates.

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