Study On Preparation And Performance Of Acrylate-based Flexible Electrode Materrials

In recent years,with the rapid development of flexible wearable devices,tactile feedback devices,energy harvesters and other fields,the dielectric elastomer generator(DEG)that uses the variable capacitor principle can provide high electromechanical conversion efficiency,high power generation and It can be miniaturized and widely used.The power generation performance of DEG is affected by many factors such as device structure,circuit design and material properties.The performance of flexible electrode materials is a crucial factor that affects the power generation performance of DEG and is an important part of DEG.However,there is still a lack of systematic research on flexible electrode materials for DEG so far,and it has not been able to meet the requirements of large deformation,high conductivity,high conductivity stability and high flexibility at the same time.In this topic,acrylic rubber is selected as the matrix of the electrode material,and the influence on the performance of the electrode material is explored by compounding with different conductive fillers and improving the experimental formula.The main research contents are as follows:(1)BP2000 and EC-600JD high-conductivity carbon black(CB)were filled with acrylate rubber(ACM)to prepare CB/ACM composite materials to explore the percolation threshold,mechanical properties and conductivity stability of different composite materials.The results show that EC-600JD carbon black has the best conductivity,reaching the percolation threshold around 8-10phr.And when filled with 20phr,the electrical conductivity of the composite material reaches ls/cm,and the elongation at break reaches more than 300%.Then based on 20phrEC-600JD carbon black,by changing the amount of vulcanizing agent(TCY)and introducing the plasticizer DOP,the effect on various properties of the composite material was preliminarily explored.The results show that increasing the amount of TCY improves the conductivity(up to 1.2s/cm)and conductivity stability of the electrode material,but the elongation at break is reduced to 160%.The addition of DOP improves the elongation at break of the electrode material,reduces the modulus and hardness,but the electrical conductivity drops to 0.5s/cm.(2)Combining carbon black and multi-walled carbon nano(MWCNT)tubes,by changing the ratio of carbon black to carbon nanotubes,explore the effect of the combined use of two conductive fillers on the performance of electrode materials.The results show that the two fillers are well dispersed in the acrylic rubber,and MWCNT acts as a "bridge" between the carbon black particles.At l0phrCB+10phrCNT,the electrical conductivity of the composite material is 0.13s/cm,the(R-R0)/R0 within 200%deformation can reach about 20%,the elongation at break is 280%,and the modulus is about l0MPa.(3)Select composite metal-based conductive filler-nickel-plated graphite(NCG),and explore the impact on the performance of electrode materials by changing the amount of nickel-plated graphite and whether to fill the coupling agent.Because NCG is an inorganic filler,it has poor compatibility with organic polymers and is easy to form agglomerates,which reduces the electrical conductivity and elongation at break of the electrode material.After adding coupling agent A151,the dispersibility of NCG in acrylic rubber is improved,and the filler network and conductive path are improved.When filled with 200phr NCG,the volume resistivity of the composite material decreased from 1010?·cm to 108?·cm,and the elongation at break increased from 172%to 192%.The above conclusions provide a direction for the research of flexible electrode materials for dielectric elastomer generators(DEG)and provide guidance for their practical use.