Elongational rheology of NIPAM-based hydrogels
(2013) Rheologica Acta : an international journal of rheology — Vol. 52, n° 5, p. 413-423 (2013)
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- Authors
Bailly, Christian 
- Abstract
- Hydrogels of different composition based on the copolymerization of N-isopropyl acrylamide and surfmers of different chemical structure were tested in elongation using Hencky/real definitions for stress, strain, and strain rate, offering a more scientific insight into the effect of deformation on the properties. In a range between ˙ε = 10 and 0.01 s−1, the material properties are independent of strain rate and show a very clear strain hardening with a “brittle” sudden fracture. The addition of surfmer increases the strain at break εmax H and at the same time leads to a failure of hyperelastic models. The samples can be stretched up to Hencky strains εmaxH between 0.6 and 2.5, depending on the molecular structure, yielding linear Young’s moduli E0 between 2,700 and 39,000 Pa. The strain-rate independence indicates an ideal rubberlike behavior and fracture in a brittle-like fashion. The resulting stress at break σmax can be correlated with εmaxH and E0 as well as with the solid molar mass between the cross-linking points Msolids c ,derived from E0.
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Citations
Stadler, F., Friedrich, T., Kraus, K., Tieke, B., & Bailly, C. (2013). Elongational rheology of NIPAM-based hydrogels. Rheologica Acta : an international journal of rheology, 52(5), 413-423. https://doi.org/10.1007/s00397-013-0690-x (Original work published 2013)