No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
Universal aspects of hydrogel gelation kinetics, percolation and viscoelasticity from PA-hydrogel rheology
3. Rabillouda, T. , M. Chevalletb, S. Lucheb, and C. Lelongb, “ Two-dimensional gel electrophoresis in proteomics: Past, present and future,” J. Proteomics 73, 2064–2077 (2010).
6. Calvet, D. , J. Y. Wong, and S. Giasson, “ Rheological monitoring of polyacrylamide gelation: Importance of cross-link density and temperature,” Macromolecules 37, 7762–7771 (2004).
7. Wang, J. , and V. M. Ugaz, “ Using in situ rheology to characterize the microstructure in photopolymerized polyacrylamide gels for DNA electrophoresis,” Electrophoresis 27, 3349–3358 (2006).
8. Savart, T. , C. Dove, and B. J. Love, “ In situ dynamic rheological study of polyacrylamide during gelation coupled with mathematical models of viscosity advancement,” Macromol. Mater. Eng. 295, 146–152 (2010).
10. Weiss, N. , and A. Silberberg, “ Inhomogeneity of polyacrylamide gel structure from permeability and viscoelasticity,” Br. Polym. J. 9, 144–150 (1977).
11. Lin, W. C. , W. Fan, A. Marcellan, D. Hourdet, and C. Creton, “ Large strain and fracture properties of poly(dimethylacrylamide)/silica hybrid hydrogels,” Macromolecules 43, 2554–2563 (2010).
12. Denisin, A. K. , and B. L. Pruitt, “ Tuning the range of polyacrylamide gel stiffness for mechanobiology applications,” ACS Appl. Mater. Interfaces (published online).
15. Baselga, J. , M. A. Llorente, J. L. Nieto, I. Hernandez, and I. F. Pierola, “ Polyacrylamide networks. Sequence distribution of crosslinker,” Eur. Polym. J. 24, 161–165 (1988).
16. Rubinstein, M. , and H. Colby, Polymer Physics ( Oxford University, New York, NY, 2003).
17. Ferry, J. D. , Viscoelastic Properties of Polymers, 3rd ed. ( John Wiley & Sons, New York, NY, 1980).
18. Chambon, F. , and H. Winter, “ Linear viscoelasticity at the gel point of a crosslinking PDMS with imbalanced stoichiometry,” J. Rheol. 31, 683–697 (1987).
22. Adam, M. , and M. Delsanti, “ Mechanical measurements in the reaction bath during the polycondensation reaction, near the gelation threshold,” Macromolecules 18, 2285–2290 (1985).
26. Giraldo, J. , N. M. Vivas, E. Vila, and A. Badia, “ Assessing the (a)symmetry of concentration-effect curves: Empirical versus mechanistic models,” Pharmacol. Ther. 95, 21–45 (2002).
Article metrics loading...
Polyacrylamide (PA) hydrogels have been studied extensively, but fundamental aspects of their gelation kinetics, percolation dynamics, and viscoelasticity are still not well understood. This paper focuses on the rheology of PA hydrogels having unusually low monomer concentrations (ca ≈ 3 w% equivalent to 0.42 mol l−1). These furnish loss tangents that span 4 orders of magnitude when varying the crosslinker concentration. An optimum crosslinker concentration (cbis/ca ≈ 2.5 mol. % equivalent to 5.3 w%) is identified, below which the storage modulus increases almost linearly, and the loss modulus acquires a local maximum. Above the optimum crosslinker concentration, and both plateau, accompanied by a notable decrease in the maximum strain (increase in brittleness) before breaking. The dynamic shear moduli reveal universal dynamics at the gel point, as indicated by (i) scaling exponents (y = 3.1 ± 0.1, z = 2.1 ± 0.1 and Δ = 0.70 ± 0.02) that are consistent with the de Gennes [“On a relation between percolationtheory and the elasticity of gels,” J. Phys. Lett. 37, L1–L2 (1976)] electrical network analogy, and (ii) a critical relaxation exponent that is close to the Rouse limit Δ = 2/3 from the scaling theory of Martin. A close correspondence of the exponents with that of Adam and Delsanti [Macromolecules 18, 2285–2290 (1985)] for the radical copolymerization of a different material supports the long-standing hypothesis that dynamics at the gel point are universal for a prescribed gelation mechanism.
Full text loading...
Most read this month