Research On Technology And Properties Of Electrospinning Fiber Of RGO/PEDOT:PSS/PVA

The preparation of conductive polymer fibers by conductive polymers has been a hot spot in the field of materials science in recent years.Compared with metal fibers,polymer conductive fibers have the advantages of low cost and strong plasticity.Among them,the aqueous solution of poly 3,4-ethylene dioxythiophene: polystyrene sulfonic acid(PEDOT:PSS)has good conductivity,which is a kind of conductive polymer with broad application prospect.However,the spinnability of PEDOT: PSS aqueous solution is poor.In order to improve its spinnability,it is necessary to use the polymer with strong spinnability to modify it before spinning.At the same time,in order to enhance the conductivity of polymer conductive fibers,doping modification is also needed.Therefore,PVA and PEDOT: PSS were compounded to solve the problem of spinnability,then rGO was doped into the system to improve its conductivity.The composite conductive fibers of rGO/PEDOT:PSS/PVA with certain mechanical properties were prepared by high-voltage electrospinning technology.In this paper,the best component ratio of PEDOT:PSS/PVA was found based on spinnability and fiber morphology.The tensile and conductive properties of rGO/PEDOT:PSS/PVA fibers under different rGO components were discussed.In addition,rGO/PEDOT:PSS was synthesized by chemical oxidation method,so as to improve the dispersion of rGO in PEDOT:PSS and reduce the agglomeration effect of non organic component rGO.At the same time,a small amount of oxygen-containing functional groups in rGO can enhance the interaction with PEDOT: PSS and effectively reduce the influence of rGO doping on the mechanical properties of fibers.In the process of spinning experiment,the conventional stationary receiving screen in the spinning machine was replaced by a high-speed rotating receiving platform,and the fiber film with a regular circular concentric shape was obtained,which had different mechanical properties advantages in "arc direction" and "radial direction" respectively.The main results of the experiment are as follows.(1)PEDOT:PSS/PVA electrospun fiber was prepared.By comparing its spinnability,the solid mass ratio of PEDOT:PSS and PVA was 4:1,and the spinning voltage was 19 KV.At this time,the conductivity of the fiber membrane was about 0.8 S/m.(2)After the preparation of rGO,the solution of rGO/PEDOT:PSS was synthesized by chemical oxidation,and the nanofibers of rGO/PEDOT:PSS/PVA were prepared by electrospinning.Compared with the morphology,mechanical properties and electrical conductivity of the fiber under different ratio,the optimal doping ratio of rGO in PEDOT:PSS was 0.2 %.At this point,its conductivity reached 1.7 S/m,which doubled by number on the basis of appropriate sacrifice of limited mechanical properties.(3)The "arc" tensile stress and "radial" elongation at break of the fibers were significantly increased by using the high-speed rotary receiving process.By contrast with no-oriented film of the same component The tensile stress of rGO/PEDOT:PSS/PVA fiber film increased from 3.2 Mpa to 4.7 Mpa,and the elongation at break gained a visible change from 24.7 mm to 39.8 mm.