Mechanical properties of poly(N-isopropylacrylamide-Co-itaconic acid) hydrogels
Keywords:N-isopropylacrylamide, Itaconic acid, Hydrogel, Crossiinking density, Storage moduli, Equilibrium water content,
It is well known that polymers of N-isopropylacrylamide (NIPA) show lower critical solution temperature (LCST) behavior in water and its gels have a volume phase transition at about 34 °C in water. In this study, we reported the polimerization of NIPA in the presence of N,N'-methylenebisacrylamide (BIS). Poly(N-isopropylacrylamide) and poly(N-isopropylacrylamide-co-itaconic acid) hydrogels were obtained by swelling the resultant solid xerogels to equilibrium in water. The effects of monomer composition and concentration of added cross-linking agent on the swelling behavior and mechanical properties of these hydrogels at 22 and 37 °C were investigated, the latter involving measurements of shear in a DMTA system. The storage moduli at 22 °C lay within the range 9.08-5.08 KPa. At a fixed BIS concentration, an increase from 22 to 37 °C resulted in an increase in the shear moduli and the effective crosslinking density (νe) and a decrease in the interaction parameter hydrogel/water, χ.
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How to Cite
Valdeturren, N. E., Quintana, J. R., & Katime, I. (2001). Mechanical properties of poly(N-isopropylacrylamide-Co-itaconic acid) hydrogels. Revista De Metalurgia, 37(2), 356–360. https://doi.org/10.3989/revmetalm.2001.v37.i2.496
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