Preparation,Characterization And Properties Of Several Graphene/Polymer Nanofiber Membranes With Coaxial Structure

Electrospinning is a simple and easy way to operate with a wide range of materials can be prepared.Nanofiber membranes prepared by electrospinning have attracted considerable attention in tissue engineering,electronic devices,batteries and electrode materials,chemical and biological sensors,catalysts,environmental cleaning applications,because of their high porosity and distinctive surface area.Graphene has also received widespread attention due to its excellent properties.Therefore,in this study,composite nanofibers with different structures of PVA,PLA,PAN and GO were prepared based on electrospinning technology.In this paper,the coaxial and single-axial nanofibers with three different polymers and GO were prepared by controlling various parameters of electrospinning and changing the concentration of graphene dispersion.The composite nanofibers were characterized by TEM,SEM,Raman,DTG and so on.The results show that the fiber has smooth surface,and is uniform in diameter,there is no graphene leakage,and there are obvious graphene peaks in the Raman spectrum,indicating that GO is successfully coated or mixed in the composite nanofiber membranes.The incorporation of graphene effectively improves the thermal stability of the fiber,enhance the thermal stability with the same content of GO,different spinning techniques.The incorporation of graphene affects the mechanical properties of the fiber.And the mechanical properties of the same GO content coaxial spinning are better than those of blended.In addition,by adding fluorescent dyes such as RhB to the PLA system and adding Pt and Fe to the PAN system,the properties of the membranes were discussed.The addition of GO increased the release of PLA system drugs,and the coaxial technique effectively reduced the burst release of drug-loaded fibers.FePt alloy content in the PAN system is too low so that the electrochemical properties of the annealed material are poor.The distribution of Fe and the annealing temperature affect the degradation efficiency.At 600? and 1000?,the degradation efficiency is better than 800?,and the degradation rate of blended spinning is higher,but the degradation efficiency is the same for long time.