Abstract
Viscoelastic properties of blend hydrogels composed of poly(vinyl alcohol) (PVA) and alginate (Alg) were studied by measuring tensile stress. Mixed aqueous solutions of PVA and Alg formed gels by repeating freeze-thaw cycles and/or by adding Ca2+ ions. The interpenetrating gels in which both polymers form networks showed greater elastic moduli, ultimate tensile strength and lower water contents than the snake-cage gels in which the network of one polymer (cage) traps the other polymer chains (snakes). The original samples, mixing ratio and the gelling sequence of the two polymers affected significantly the viscoelastic properties of the snake-cage and the interpenetrating gels. The equilibrium elastic moduli of the interpenetrating gels were discussed by using theoretical models of blend hydrogels. Simultaneous stress change was observed with the transition between the snake-cage and the interpenetrating gels.
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Yonese, M., Baba, K. & Kishimoto, H. Viscoelastic Properties of Poly(vinyl alcohol)/Alginate Snake-Cage Hydrogels and Interpenetrating Hydrogels. Polym J 24, 395–404 (1992). https://doi.org/10.1295/polymj.24.395
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DOI: https://doi.org/10.1295/polymj.24.395