The influence of plasma treatment by plasma activation equipment on the piezoresistive characteristics of carbon black/silicone rubber

• Categories:Industry News
• Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
• Origin:
• Time of issue:2021-10-26
• Views:

(Summary description)The influence of plasma treatment by plasma activation equipment on the piezoresistive characteristics of carbon black/silicone rubber: Carbon black/silicone rubber is a good material for manufacturing flexible sensors due to its piezoresistive effect and good flexibility. However, this type of material has a small range of resistance change, poor sensitivity to pressure signals, and carbon black is easy to prepare in the preparation. Agglomeration makes it unevenly dispersed in the rubber and affects the stability of the piezoresistive performance. 　　 Add nano Al2O3 particles to carbon black/silicone rubber to improve the stability of the material's electrical properties and maintain good flexibility, and also increase the pressure sensitivity range of the material. Mixing the non-fused base materials polypropylene and polystyrene to control the carbon black particles to be selectively located at the interface of the two bases to form a rod-like structure, so that the carbon black forms a stable and uniform conductive network, and improves the piezoresistive properties of the material . 　　The carbon blacks of different particle sizes were mixed, and it was found that the carbon black with a certain distribution of particle size and specific surface area in the material has better conductivity and dispersibility than the single-distributed carbon black. The carbon black is treated with a coupling agent to improve its dispersibility in the epoxy resin and improve the conductivity of the material. 　　 The above-mentioned methods all change the original two-phase structure of the material, and at the same time have a certain influence on the flexibility of the material. Plasma treatment by plasma activation equipment can not only change the surface chemical properties of carbon materials, but also control the surface physical properties of the materials. Compared with the sample without plasma treatment, the resistance of the sample made of carbon black after plasma treatment by plasma activation equipment is reduced, while the resistance of the treated sample is significantly increased, and the resistance range is greatly changed. improve. The plasma-treated carbon black samples have higher pressure sensitivity. 　　 When carbon black/silicone rubber is deformed by external pressure, friction will be generated between the macromolecular chains of silicone rubber. At the same time, friction will also be generated between silicone rubber molecules and carbon black molecules. After 　　 carbon black is treated with plasma, the piezoresistive performance of the sample has obvious changes, and different plasmas significantly affect the piezoresistive performance of the sample. In addition, plasma treatment improves the pressure sensitivity of the sample. 　　 argon plasma activation equipment plasma treatment removes part of the oxygen-containing impurities on the surface of carbon black and introduces nitrogen-containing functional groups. Its effect is similar to that of oxygen-containing functional groups. It acts as an electron trap and causes the resistance of carbon black to increase. Argon is an inert gas. After argon plasma treatment, the impurities, functional groups and unstable boundary layers that trap electrons on the carbon black surface are removed, the conductivity of the carbon black is improved, and the resistance is reduced. Plasma treatment increases the specific surface area of ​​carbon black. When carbon black/silicone rubber is pressed, the probability of contact between carbon black particles is greatly increased, which makes the resistance change of the sample more obvious and is more sensitive to pressure sex. 　　Plasma treatment improves the pressure sensitivity of carbon black/silicone rubber. After plasma treatment by plasma activation equipment, the carbon black is more uniformly dispersed in the silicone rubber matrix and the particle size is smaller; the etching effect of the plasma on the carbon black increases the contact probability between the carbon black during the pressure process, and it is easy to form electrical conductivity aisle.