| Silicone rubber is an important rubber material.It has excellent heat resistance,weather resistance and biocompatibility.It can also be made into a variety of colorful silicone rubber products by adding colorants.These are excellent characteristic that ordinary rubber does not have.Silicone rubber enriched the use of rubber products in daily life,but the mechanical properties of pure silicone rubber are poor.Existing research shows that fillers can rapidly increase the tensile strength of silicone rabber,the more fillers added,the worse the elasticity of silicone rubber material.Through experiments in this paper,it was found that the Fe3O4 magnetic nanoparticles coated with oleic acid and hydrophobic silica were added into the silicone rubber as a filler,which could significantly increase the elasticity of the silicone rubber material and ensure that the original tensile strength was not greatly affected while the elastic was increased.This composite silicone rubber material also has superparamagnetic properties,and has good heat resistance.The comprehensive performance of silicone rubber is improved,and the applicable scenes are also increased.In addition,this paper also studies the influence of oleic acid on the mechanical properties and heat resistance of silicone rubber materials,and analyzes the changes in the chemical bonding state of silicone rubber by Fourier transform infrared spectroscopy.The main research contents and results of the paper are as follows:(1)First,the Fe3O4 magnetic nanoparticles were prepared by traditional co-precipitation method,and they were modified with surface modifier oleic acid to prevent the oxidation of Fe3O4 nanoparticles,and the experimental conditions for the preparation of Fe3O4 nanoparticles by co-precipitation method the optimization was carried out,and the prepared oleic acid-coated Fe3O4 nanoparticles were characterized and analyzed.(2)By adding oleic acid to silicone rubber,the effect of oleic acid on silicone rubber materials was studied.The experiment found that after the addition of oleic acid,the stress-strain curve of the silicone rubber sample showed an obvious drawing stage,and the elongation at break also increased accordingly.The elasticity was obviously improved,but the tensile strength was greatly reduced.At the same time,thermogravimetric analysis showed that oleic acid has little effect on heat resistance of silicone rubber.In general,oleic acid deteriorates the mechanical properties of silicone rubber,and the appearance becomes yellowish.Adding oleic acid to silicone rubber products greatly reduces the elastic modulus.(3)An enhanced study of silicone rubber material was carried out using oleic acid coated Fe3O4 magnetic nanoparticles and silica as fillers.Experimental results show that the fracture tensile rate of silica rubber with oleic acid coated nano Fe3O4 magnetic particles is up to 1931%,which is more than three times that of ordinary silicone rubber.In addition,the super-stretched silicone rubber composites produced by the experiment also showed superparamagnetism.To sum up,this article innovatively uses a core-shell Fe3O4 magnetic nanoparticle as a silicone rubber filler.It is found that the silicone rubber composite prepared by the addition of the filler and hydrophobic silica has ultra-high elasticity and super paramagnetic properties.Because the raw materials such as silicone rubber and Fe3O4 are non-toxic and harmless,the bioco MPatibility of this composite material is bound to be not bad.Therefore,the silicone rubber composite materials prepared in this paper have huge application potential. |
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