Fabrication and functional study of graphene/polyacrylonitrile skin core structural fibers
Graphene,as a new type of two-dimensional carbon nanomaterial,has emerged as a prominent research focus in recent years due to its unique composition and excellent conductivity,thermal conductivity,and mechanical properties.The graphene fiber,a novel carbon-based fiber crafted from graphene layers,inherits the advantages of graphene,such as lightweight and flexibility.In many practical applications,balancing the multiple properties of graphene fibers can be challenging,and it is necessary to choose a suitable spinning method to regulate the chemical composition and structure of graphene fibers and polymers,so as to broaden the application field of graphene-based fibers.Polyacrylonitrile is a synthetic fiber with good elasticity and weather resistance.It can be used in industrial production through wet spinning and can be combined with graphene incorporation to obtain high-performance composite fibers.Microfluidic spinning technology is a new type of spinning technology developed on the basis of microfluidic chip technology,which is combined with wet spinning technology to build a microfluidic wet spinning system.Microfluidic chip technology enables precise control over the microstructure of spinning solutions and is characterized by a high degree of miniaturization,integration,and cost-effectiveness.This article utilizes microfluidic wet spinning technology to prepare a novel type of conductive fiber with a core-sheath structure.By precisely adjusting the spinning fluid inside the microfluidic chip spinning channel,the spinning fluid exhibits laminar flow characteristics in the microchannel.Through a simple process,the directional control of graphene in the fiber outer layer is achieved,fully utilizing the high conductivity and high specific surface area of the outer layer material,as well as the mechanical properties of the core layer polyacrylonitrile fiber.As the flow rate of the composite fiber layer increases,the arrangement of graphene in the fiber layer gradually becomes standardized under shear stress and compression in the microfluidic chip channel,forming a continuous conductive path.The article studied the morphology,mechanical properties,and electrical properties of skin core fibers.In SEM images and stress-strain curves,compared with pure polyacrylonitrile fibers,the diameter and strength of composite fibers showed a trend of first increasing and then decreasing with the increase of skin solution.The resistance of core-sheath composite fibers decreased and the conductivity increased.When the skin flow rate reached a certain value,due to the aggregation of graphene in microchannels,the conductivity of the composite fibers decreased,and their mechanical properties also declined.It could be found that by applying different voltages at both ends of the composite fiber to test the electrical heating performance of the composite fiber,the highest temperature reached by the fiber and the heating rate per second vary under different voltages.The higher the voltage applied at both ends of the fiber,the greater the maximum temperature reached and the heating rate also increases.The test shows that the core-sheath fibers had good thermal stability and electrical cycling,and the voltage at both ends of the composite fiber could be quickly heated to the expected temperature.Functional heating conductive fibers are poised for long-term development in the textile industry,driven by intelligent production processes and technologies.The study of microfluidic wet spinning of graphene and polyacrylonitrile in this article can provide some reference for the development and application of conductive fibers.
万方数据
维普
