PNIPAM/锂藻土/GO近红外光响应水凝胶的制备及其应用初探

Preparation and preliminary application of PNIPAM/laponite/graphene oxide near-infrared light responsive hydrogels

以锂藻土(L)为交联剂、氧化石墨烯(GO)为光热转换试剂,通过N-异丙基丙烯酰胺(NIPAM)原位聚合,制备了近红外光(NIR)响应(L-PNIPAM/GO)水凝胶。考察了锂藻土含量对L-PNIPAM水凝胶的断裂伸长率和拉伸强度的影响,并考察了GO含量对L-PNIPAM/GO水凝胶相关性能的影响。对所制备的水凝胶体积相转变温度(VPTT)及NIR响应性进行了表征,并对L-PNIPAM/GO水凝胶在光控流体开关及光控脱附方面的应用进行了初步探索。结果表明,当锂藻土和GO含量分别为NIPAM质量的12.0%和0.21%时,制备的L-PNIPAM/GO-12.0-0.21水凝胶具有较高的拉伸强度和良好的韧性,拉伸强度为123.98kPa,断裂伸长率可达1181%,L-PNIPAM/GO-12.0-0.21水凝胶的VPTT为36℃;NIR照射下,L-PNIPAM/GO-12.0-0.21水凝胶能在300 s内从20.3℃升温至48.5℃,具有温敏性和光热效应,展示了用于光控流体开关及光控脱附的潜力。

Near-infrared light(NIR) responsive(L-PNIPAM/GO) hydrogels were prepared by in situ polymerization of N-isopropylacrylamide(NIPAM) using laponite(L) as crosslinking agent and graphene oxide(GO) as photothermal conversion reagent. The effects of laponite content on the breaking elongation and tensile strength of L-PNIPAM hydrogels were investigated. And the effects of GO content on the related properties of L-PNIPAM/GO hydrogels were studied. The volume phase transition temperature(VPTT) and NIR responsiveness of the prepared hydrogels were characterized and the application of L-PNIPAM/GO hydrogel in light-controlled fluid switch and light-controlled desorption was preliminary explored. The results showed that when the contents of laponite and GO were 12.0% and 0.21% of NIPAM mass, the prepared L-PNIPAM/GO-12.0-0.21 hydrogel had high strength and good toughness, the tensile strength and elongation at break was 123.98 kPa and 1181%. The VPTT of L-PNIPAM/GO-12.0-0.21 hydrogel was about 36 ℃. Under NIR irradiation, the temperature of L-PNIPAM/GO-12.0-0.21 hydrogel rose from 20.3 ℃ to 48.5 ℃ within 300 s, indicating that L-PNIPAM/GO-12.0-0.21 hydrogel had temperature sensitivity and photothermal effect. Thus, L-PNIPAM/GO-12.0-0.21 has the potential as light-controlled adhesion reagent and fluid switch.