The rheological behavior of chemically crosslinked hydrogels based on poly(acrylamide)

I. Neamtu; L. E. Nita; M. Bercea; A. P. Chiriac

Published : 2022-08-18

Vol. 54 No. 11-12 (2009)

The rheological behavior of chemically crosslinked hydrogels based on poly(acrylamide)

I. Neamtu L. E. Nita M. Bercea A. P. Chiriac

Abstract

The effects of different ratios of monomer/crosslinking agent and initiator/activator (potassium peroxydisulfate/ascorbic acid) concentrations on the polymerization of acrylamide (AAm) crosslinked with N,N-methylene-bis-acrylamide (Bis) were studied by dynamic oscilatory testing and gel point (GP) quantitative determination. In the studied conditions, rheological response of PAAm gelation - elastic and viscous moduli, loss tangent and complex dynamic viscosity - indicates these properties could transit between elasticity and viscoelasticity dependently on the reaction time and reactants' ratios. After a certain induction period during which the elastic modulus is close to zero, it increases monotonically until equilibrium is reached.

Keywords

hydrożel ; poliakryloamid ; inicjowanie redoksy ; właściwości lepkosprężyste ; punkt żelowania ; dynamiczna metoda oscylacyjna ; badania in situ hydrogel ; poly(acrylamide) ; redox initiation ; viscoelastic properties ; gel point ; dynamic oscillatory method ; in situ testing

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Neamtu, I., Nita, L. E., Bercea, M., & Chiriac, A. P. (2022). The rheological behavior of chemically crosslinked hydrogels based on poly(acrylamide). Polimery, 54(11-12), 795–800. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1259

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