| Electroactive polymer（EAP）is known as“artificial muscle”,can be used as flexible actuator and sensor.It has the advantages of low energy consumption,light weight,good compliance and good biocompatibility.The working mechanism of Ionic EAP——Ionic polymer-metal composites（IPMC）is as follows:Under the electric field,The hydrated cation inside the ion exchange polymer film migrates along the inner pipe,forming an ion concentration gradient between the two electrodes,resulting in swelling,external output force and displacement.The existing IPMC has the problems of electrode falling off,short stable working time and high preparation cost.In this paper,conductive polymers（such as poly（3,4-ethylene dioxythiophene）（PEDOT）and polypyrrole（PPy））are studied.And they are used as electrodes and electrolyte films respectively to replace the metal Pt electrode and Nafion ion exchange film of conventional IPMC,so as to obtain ionic polymer drivers with excellent driving performance.Used polyvinylpyrrolidone（PVP）and polyethylene oxide（PEO）as pore-forming agents and ionic liquid of[EMIm?BF4]as the plasticizer,to prepare a highly porous flexible polyvinylidene fluoride（PVDF）matrix film.Physicochemical tests showed that,PVDF matrix film presented a high porosity of 26.3%,and a low Young￠s modulus of 17.1 MPa.Used 3,4-vinylenedioxythiophene（EDPT）as the monomer,Fe Cl3 as the catalyst,conductive PEDOT electrodes were anchored on both sides of the PVDF film by in situ chemical deposition.The test results showed that,drivenby a 0.1 Hz,22 V voltage signal,the resultant IPMC actuator produced continuous and stable driving behaviors with a maximum displacement output of 6.0 mm.Changing driven voltage or frequency,the displacement outputs subsequently changes,showing a good controllability.Used pyrrole as monomer,sodium p-toluenesulfonate（TSA-Na）as dopant,the method of constant current chemical deposition,and then a conductive polymer PPy was deposited on the surface of nickel foam.Used EDOT as monomer,polyphenylene sulfonic acid as dopant,the method of potentiostatic chemical deposition,and then a layer of conductive polymer PEDOT was deposited on the surface of PPy.The test results showed that:there was a strong interaction between PPy and PEDOT film,and the compatibility between them was good;the composite film of PPy and PEDOT had a certain charge storage capacity and could be used as the composite electrode of IPMC.The introduction of PEDOT was conducived to the rapid ion charge transfer on the surface of PPy.The composite film could be used as the electrolyte film of high-frequency IPMC.Designed A novel polymer driver driven by electric field induction.TSA/PPy composite film was directly used as electrolyte film,and without metal electrode.Driven by electric field induction,an electrode free ionic polymer driver is obtained.The test results show that:at 0.1 Hz,9 k V DC voltage,the new EIP actuator produced continuous bending deformation and showed a stable electric drive response.It showed that the electric field induction can be used as the driving source to drive the IPMC motion;The deflection angle of the driver increased with the increase of the driving voltage,and showed a high degree of controllability. |
