The Dielectric And Electroactive Strain Properties Of Novel Acrylic Resin Based Composite Films

Dielectric elastomer(DE)is a type of electroactive polymers(EAPs)with superior performance.In the electric field,DE materials can deform,thereby converting the electric energy into mechanical energy.Due to this feature of DE materials,scientists have designed a variety of dielectric elastomer actuators(DEAs).Since DEA has many advantages,such as high energy density,low cost and large electric field induced strain,it has broad prospects in the fields of aerospace,intelligent robot etc.In this paper,acrylic resin elastomer(ACE)was synthesized.And by way of esterification,the copper phthalocyanine oligomer(CuPc)was grafted onto the molecular chain of ACE directly,which prepared grafted composite(ACE-g-CuPc).The test results of FT-IR,1H-NMR and ICP of ACE-g-CuPc demonstrated the success of the esterification reaction.The results of TEM showed that in the blend composites(ACE/CuPc),the size of CuPc particles was about 500 nm,which was 25 times than that of grafted polymers.The results of DSC and TGA showed that the addition of CuPc improved the thermal stability of composites.Furthermore,it was found that the dielectric constant and dielectric loss of ACE-g-CuPc decreased under increasing frequency,and increased with the mass fraction of CuPc increasing.Compared to the blend composites,the grafted composites films had better dielectric properties.At room temperature,the dielectric constant of ACE-g-11%CuPc reached173 at 100 Hz.By analyzing the stress-strain curves,it could be found that the elastic modulus of grafted composites films not only increased with the mass fraction of BA decreasing,but also increased with the mass fraction of CuPc increasing.When BA content was 65%,the elastic modulus of ACE-g-2%CuPc was 1.03 MPa.Since the conventional carbon grease electrode is liquid,thus limits the application of DEA.It has a great practical significance for developing a new type of cross-linking flexible electrode.In this paper,a new flexible electrode material(silicone rubber electrode)was prepared,in which the silicone rubber as matrix and carbon black as filler.And the factors that affected volume resistivity of electrodes were studied.The results showed that the volume resistivity of the electrode decreased with the volume fraction of carbon black increasing,and it decreased then increased with the mass fraction of tetraethoxysilane increasing.Besides,the volume resistivity of the electrode decreased first andincreased later with the increase of dibutyltindilaurate mass fraction,and it decreased with the increase of heptane mass fraction.In this paper,the factors that affected the electric field induced strains of the films and the failure mode of DEA were studied.The results showed that,compared with other acrylic elastomer composites,the ACE-g-CuPc films not only had a low CuPc content(2%)but also generated a 2.0%electric field induced strain in the electric field of only 13.3 MV/m.The main failure mode of DEA was breakdown,and in this paper the reasons for it were identified and the solutions were found.