Nanocomposite Hydrogels - Fracture Toughness and Energy Dissipation Mechanisms
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In: Journal of polymer science : B, Polymer physics, No. 53, 08.10.2015, p. 1763 - 1773.
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TY - JOUR
T1 - Nanocomposite Hydrogels - Fracture Toughness and Energy Dissipation Mechanisms
AU - Klein, Andrea
AU - Whitten, Philip, G.
AU - Resch, Katharina
AU - Pinter, Gerald
PY - 2015/10/8
Y1 - 2015/10/8
N2 - In this study, fracture toughness of nanocompositehydrogels is quantified, and active mechanisms for dissipationof energy of nanocomposite hydrogels are ascertained.Poly(N,N-dimethylacrylamide) nanocomposite hydrogels areprepared by in situ free radical polymerization with the incorporationof Laponite, a hectorite synthetic clay. Transmissionelectron microscopy proves exfoliation of clay platelets thatserve as multifunctional crosslinkers in the created physicalnetwork. Extraordinary high fracture energies of up to 6800J m22 are determined by the pure shear test approach, whichshows that these soft and stretchable hydrogels are insensitiveto notches. In contrast to single- and double-network hydrogels,dynamic mechanic analysis and stress relaxation experimentsclarify that significant viscoelastic dissipation occursduring deformation of nanocomposite hydrogels. Similar todouble-network hydrogels, crack tip blunting and plastic deformationalso contribute to the observed massive fracture energies.
AB - In this study, fracture toughness of nanocompositehydrogels is quantified, and active mechanisms for dissipationof energy of nanocomposite hydrogels are ascertained.Poly(N,N-dimethylacrylamide) nanocomposite hydrogels areprepared by in situ free radical polymerization with the incorporationof Laponite, a hectorite synthetic clay. Transmissionelectron microscopy proves exfoliation of clay platelets thatserve as multifunctional crosslinkers in the created physicalnetwork. Extraordinary high fracture energies of up to 6800J m22 are determined by the pure shear test approach, whichshows that these soft and stretchable hydrogels are insensitiveto notches. In contrast to single- and double-network hydrogels,dynamic mechanic analysis and stress relaxation experimentsclarify that significant viscoelastic dissipation occursduring deformation of nanocomposite hydrogels. Similar todouble-network hydrogels, crack tip blunting and plastic deformationalso contribute to the observed massive fracture energies.
M3 - Article
SP - 1763
EP - 1773
JO - Journal of polymer science : B, Polymer physics
JF - Journal of polymer science : B, Polymer physics
SN - 0887-6266
IS - 53
ER -