基于聚N-异丙基丙烯酰胺的光热响应水凝胶的制备与表征

Preparation and Characterization of Photothermal Response Hydrogels Based on Poly(N-isopropylacrylamide)

通过一锅法制备了含有氧化石墨烯(GO)的聚N-异丙基丙烯酰胺(PNIPAM)/聚乙烯醇(PVA)光热响应纳米复合水凝胶,并对产物的形貌、结构及性能进行了表征。研究了PVA对PNIPAM/PVA水凝胶透光率的影响,以及GO含量对PNIPAM/PVA/GO水凝胶力学性能和光热响应的影响。结果表明,在PNIPAM水凝胶中引入PVA后,并未影响低临界溶解温度(LCST),LCST值仍为32℃;扫描电子显微镜表明GO/PNIPAM/PVA纳米复合水凝胶结构紧密,孔洞大小均一;当GO含量为NIPAM质量的0.89%时,制备的GO/PNIPAM/PVA水凝胶具有最佳力学性能,拉伸强度为40.1kPa,断裂伸长率可达335.6%;近红外光(NIR)照射GO含量为NIPAM质量的1.11%的GO/PNIPAM/PVA水凝胶150s,其温度能从17.2℃升到42.5℃,具有优异的光热性能。

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.