PNIPAM/Fe^(3+)/CNF-c复合水凝胶的制备及其驱动性能研究

Study on preparation and actuating performance of PNIPAM/Fe^(3+)/CNF-c composite hydrogel

将六水合三氯化铁(FeCl_(3)·6H_(2)O)和羧基化纳米纤维素(CNF-c)引入聚N-异丙基丙烯酰胺(PNIPAM)水凝胶中,通过一步简单的自由基聚合法制备出了具有各向异性结构的温度响应型复合水凝胶.将这种水凝胶制备成长条状并对其温度响应驱动行为进行了研究.结果表明,与PNIPAM水凝胶相比,复合水凝胶具有更好的温度响应性能.当Fe^(3+)浓度为0.055 mol/L时,复合水凝胶的驱动速度最快,在23 s内弯曲角度可达到180°,且具有良好的循环稳定性.所制备的复合水凝胶可作为抓手,用来夹取、运输和释放物体.更重要的是,这种制备方法仅需在常温常压下就可完成.制备工艺简单、驱动速度快的温度响应型水凝胶在软体驱动器领域具有广阔的应用前景.

A simple one-step radical polymerization approach was used to create anisotropic thermoresponsive composite hydrogels by incorporating Ferric chloride hexahydrate(FeCl_(3)·6H_(2)O)and carboxylated nanocellulose(CNF-c)into poly(N-isopropylacrylamide)(PNIPAM)hydrogel.The hydrogel was formed into long strips for the experiment,and its temperature response driving behavior was investigated.The results reveal that the composite hydrogel responds to temperature better than the PNIPAM hydrogel.When the Fe^(3+)concentration is 0.055 mol/L,the composite hydrogel has the quickest driving speed,the bending Angle can reach 180°in 23 s,and the composite hydrogel has high cycle stability.The created composite hydrogel may be utilized to grab、carry and release items like a gripper.More importantly,this preparation method can be completed only under normal temperature and pressure.This thermoresponsive hydrogel with simple preparation process and fast driving speed has a broad application prospect in the field of soft Actuator.