Equilibrium swelling of hydrogel

Figure 2. a) Plot of equilibrium swelling of hydrogel, as a function of initial fixed charge density (ionized MAA content) as predicted by model b) Predicted swelling of the hydrogel as a function of pH in Cell II. 

Figure 7.1.14. Effect of pH on the equilibrium swelling of hydrogel. [Data from M Sen, A Yakar, O Guven, Polymer, 40, No.l 1,2969-74 (1999).]...

The percentage of equilibrium swelling of hydrogel was calculated using the following Eq. (12.1). 

Fig. 2a, b. Equilibrium swelling of amphoteric PVA hydrogel in a. water/acetone mixture, b. HC1/KOH aqueous solution. The H-type was pretreated by IN HC1 and K-type by IN KOH... 

Orlov Y, Xu X, Maurer G (2006) Equilibrium swelling of n-isopropylacrylamide based ionic hydrogels in aqueous solutions of organic solvents comparison of experiment with theory. Fluid Phase Equilib 249(l-2) 6-16... 

Effect of Chemical Structure on Equilibrium Swelling of Selected Hydrogels [19]... 

Figure 4. Effect of the pH on the equilibrium swelling for hydrogels with different acrylamide/chitosan mass ratios (mAM/nics) ( 95/5, A 90/10, I 85/15, - 80/20)...

Unfortunately, reliable data on the equilibrium swelling and long-term stability of hydrogels obtained by this method are not available. It should be noted that crosslinking of polymers with metal ions is one of the few reactions which can be carried out directly in the soil medium, which is efficiently used, e.g., in oil recovery [65, 66]. 

In contrast to polyelectrolyte hydrogels, nonionic ones are almost insensitive to the ionic composition of the medium. In particular, the equilibrium swelling degree of a charge-free PAAm gel practically does not depend on the Cu2 + concentration (Fig. 4, curve 0) nor on the concentration of several other ions or on the pH value [101]. 

The equilibrium swelling degree is the most important property of a hydrogel it directly influences the rate of water sorption, the permeability to drugs, and the mechanical strength of the gel. It also affects the biocompatibility of the... 

Brannon-Peppas L and Peppas NA. Equilibrium swelling behavior of pH-sensitive hydrogels. Chemical Engineering Science 1991 46 715-722. 

Fig. 7. Structure diagram of the equilibrium swelling conformations charged hydrogels assume in a poor solvent for varying charge fraction f and Bjerrum length...

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