Abstract
In this study, fracture toughness of nanocomposite
hydrogels is quantified, and active mechanisms for dissipation
of energy of nanocomposite hydrogels are ascertained.
Poly(N,N-dimethylacrylamide) nanocomposite hydrogels are
prepared by in situ free radical polymerization with the incorporation
of Laponite, a hectorite synthetic clay. Transmission
electron microscopy proves exfoliation of clay platelets that
serve as multifunctional crosslinkers in the created physical
network. Extraordinary high fracture energies of up to 6800
J m22 are determined by the pure shear test approach, which
shows that these soft and stretchable hydrogels are insensitive
to notches. In contrast to single- and double-network hydrogels,
dynamic mechanic analysis and stress relaxation experiments
clarify that significant viscoelastic dissipation occurs
during deformation of nanocomposite hydrogels. Similar to
double-network hydrogels, crack tip blunting and plastic deformation
also contribute to the observed massive fracture energies.
hydrogels is quantified, and active mechanisms for dissipation
of energy of nanocomposite hydrogels are ascertained.
Poly(N,N-dimethylacrylamide) nanocomposite hydrogels are
prepared by in situ free radical polymerization with the incorporation
of Laponite, a hectorite synthetic clay. Transmission
electron microscopy proves exfoliation of clay platelets that
serve as multifunctional crosslinkers in the created physical
network. Extraordinary high fracture energies of up to 6800
J m22 are determined by the pure shear test approach, which
shows that these soft and stretchable hydrogels are insensitive
to notches. In contrast to single- and double-network hydrogels,
dynamic mechanic analysis and stress relaxation experiments
clarify that significant viscoelastic dissipation occurs
during deformation of nanocomposite hydrogels. Similar to
double-network hydrogels, crack tip blunting and plastic deformation
also contribute to the observed massive fracture energies.
Translated title of the contribution | Nanocomposite Hydrogele - Bruchzähigkeit und Energiedissipationsmechanismen |
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Original language | English |
Pages (from-to) | 1763 - 1773 |
Number of pages | 11 |
Journal | Journal of polymer science : B, Polymer physics |
Issue number | 53 |
Publication status | Published - 8 Oct 2015 |