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Inhomogeneity Development During Slow, Irreversible Cross‐ L inking of Gelatin
Author(s) -
Souguir Hayfa,
Baumberger Tristan
Publication year - 2013
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201300006
Subject(s) - gelatin , counterion , modulus , elastic modulus , chemistry , viscoelasticity , materials science , biophysics , chemical engineering , composite material , ion , biochemistry , organic chemistry , engineering , biology
Summary Gelatin gels, permanently cross‐linked following two different routes, exhibit the same phenomenology in which their turbidity builds‐up in concert with their elastic modulus. This is analyzed in terms of a minimal model for the chemo‐osmotic coupling mechanism first proposed by Bastide and Candau (in: “Physical Properties of Polymeric Gels”, J.‐P. Cohen Addad Ed., J. Wiley & Sons, New York 1996). The analysis points out the important role of labile counterions, which usually stiffen (osmotically) the gel, thereby hindering the coupling. This might be the reason why this a priori generic mechanism was not observed earlier.