Performance Optimization Of IPMC Based On Modification PFSA Membrane

As a new kind of smart materials,ionic polymer metal composites(IPMC)is made by depositing precious metal electrode on both sides of ionic polymer membrane chemically.IPMC with good flexibility can produce a larger dynamic deformation under electric field.Thus IPMC has a broad potential applications in artificial muscle,medical engineering and actuators and sensors.But the IPMC has two major shortcomings:low blocking force and short air-operation time which limited the actual applications of IPMC.In this paper,the driving performance of IPMC is improved by improving the preparation process and basement membrane modification,so as to enhance the output of displacement and force of IPMC and lay a foundation for practical application.The details are as follows:(1)The preparation process of IPMC was improved.Four different coarsening methods(longitudinal roughening,transverse roughening,grid roughening and mechanical roughening)are used to coarsen the basement membrane to improve the construction mode of the interface between the basement membrane and metal electrode,so as to improve the driving performance of IPMC.Among them,the IPMC which was prepared by the grid roughening method has the best performance.On the basis of economy,environmental protection and no pollution,the preparation process of IPMC is improved,which laid a certain experimental foundation for the performance improvement,innovative research and development of IPMC in the subsequent stage.(2)By doping different content of silica-graphene oxide(SiO2-GO)into the perfluorosulfonic acid(PFSA)solution,the effects of SiO2-GO on the structure,morphology and properties of IPMC were studied.Firstly,SiO2 was grafted onto graphene oxide(GO)by in-situ hydrolysis to make SiO2-GO,then the different contents of SiO2-GO were added into PFSA solution to form membrane.At last the IPMC was prepared by electroless platinum plating and its surface resistivity,moisture content,displacement and blocking force were tested.The influence of SiO2-GO particles on IPMC was analyzed,and the corresponding behavior is compared with that of pure PFSA based IPMC actuator.The results show that the performance of IPMC with lwt%SiO2-GO is the best in all samples.Under AC voltage,the displacement of IPMC with 1wt%SiO2-GO is 28.4 mm,which is 3.2 times that of pure PFSA based IPMC.The maximum displacement under DC voltage reaches 44.7 mm and the output force reaches 43.2 mN,increasing by 1.1 times and 2 times respectively.(3)In order to further improve the driving performance of IPMC,this paper studied the effects of different content of silica sulfonated graphene(SiO2-SGO)on the structure,morphology and properties of IPMC based on the above contents.Considering that the hydrophilic sulfonic acid group can form spherical ion clusters in aqueous solution to migrate hydrate cations,and the conductivity of sulfonated graphene(SGO)is higher than GO,which is conducive to improve the driving performance of IPMC.Firstly,GO was sulfonated,and then SiO2 was grafted onto SGO to make SiO2-SGO,and added the different contents of SiO2-SGO to PFSA solution to pour into membrane.After that,prepared the IPMC by the electroless platinum plating,and tested its surface resistivity,moisture content,output displacement and output force,finally analyzed the effect of adding SiO2-SGO particles on IPMC.The results show that the introduction of sulfonic acid group further improves the water content,conductivity and ion exchange capacity of PFSA membrane.In terms of driving performance,the displacement of IPMC with 1wt%SiO2-SGO can reach 33.5 mm under AC voltage and work for 600 sunder non-water environment,and its maximum output displacement is 47.7 mm and the maximum output force is 47.5 mN under DC voltage.