Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 130, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3078267
Keywords
biomedical materials; cracks; fracture; gelatin; hydrogels; polymer gels; viscosity
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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 thermoreversibility, thermally activated unzipping of the noncovalent cross-link zones results in slow crack propagation, prevailing 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 [T. Baumberger , Nat. Mater. 5, 552 (2006)] to account for both mechanisms and estimate the microscopic unzipping rates.
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