Preparation and Characterization of Photothermal Response Hydrogels Based on Poly(N-isopropylacrylamide)
Poly(N-isopropylacrylamide)(PNIPAM)/poly(vinyl alcohol)(PVA)photothermal responsive nanocomposite hydrogels containing graphene oxide(GO)were prepared by a one-pot method,and the morphology,structure,and properties of the products were characterized in this study.The effect of PVA on the transmittance of PNIPAM/PVA hydrogel and the effect of GO content on the mechanical properties and photothermal response of PNIPAM/PVA/GO hydrogel were studied.The results showed that the introduction of PVA into PNIPAM hydrogel did not affect its lower critical solution temperature(LCST)value,and the LCST value was still 32 ℃.Scanning electron microscopy results showed that the GO/PNIPAM/PVA nanocomposite hydrogel had a compact structure and uniform pore size.When the GO content is 0.89％of the mass of NIPAM,the prepared GO/PNIPAM/PVA hydrogel has the optimal mechanical properties,the tensile strength is 40.1 kPa,and the elongation at break can reach 335.6％.The GO/PNIPAM/PVA hydrogel with GO content of 1.11％of NIPAM mass was irradiated by near-infrared light(NIR)for 150 s,and its temperature could rise from 17.2 ℃ to 42.5 ℃,showing excellent photothermal performance.
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