气致驱动聚苯胺/聚氨酯双层薄膜的制备与表征

Fabrication and Characterization of Chemical Vapor-actuated PANI/PU Bilayer

以电纺聚氨酯(PU)纤维膜为基底,用滴涂聚苯胺(PANI)的方法制备了具有不对称结构的PANI/PU双层薄膜气致驱动器.研究结果表明,在HCl气体的诱导下,该PANI/PU双层膜表现出弯曲-恢复的形变行为,这与HCl对聚苯胺的吸/脱附及掺杂/脱掺杂有关.此外,对驱动器承重的研究结果表明,PANI/PU双层人工智能肌肉可承重其自身重量的9倍以上,显示出良好的承重能力.

Polyaniline（PANI） and its derives have emerged as a group of most promising organic conducting polymers due to its low cost,easy preparation,excellent environmental stability,facile redox and pH switching behavior.Particularly,its response to electrochemical and chemical doping-dedoping process,can produce changes in conductivity,color volume,and so forth,they have been widely used in a variety of nonvolatile memory,chemical sensors,actuators,and so on.Polyaniline/polyurethane（PANI/PU） bilayer actuators were fabricated using PANI nanofibers as active material and electrospun polyurethane（PU） fibers as substrate.It was found that the PANI/PU bilayer actuators underwent bending-recovery movement induced by hydrochloride vapor.The deformation mechanism of the bilayer actuators might result from asymmetric volume expansion/contraction because of doping/dedoping and sorption/desorption of chemical vapors.Moreover,the PANI/PU bilayer actuator could carry over 9 times its own weight due to the high toughness of PU fibers,displaying the well load-bearing capacity.Because the PANI/PU actuator is ultra-lightweight,low cost and simple operation,it is advantageous for practical applications in the future.However,actuating performance of the bilayer like lifetime,deformability still need to be improved.