Study on properties of hydrogenated nitrile butadiene rubber filled with polyaniline compound silica

Polyaniline was synthesized by chemical oxidation polymerization, and polyaniline-silica (PANI-SiO2) nanocomposites were prepared by precipitation method. A reinforced PANI-SiO2/HNBR was obtained by filling the PANI-SiO2 composites into hydrogenated nitrile rubber (HNBR). The amino cations contained in acid-doped PANI can electrostatically attract SiO32-, so that SiO2 can grow directly on the surface of PANI, thus reducing the agglomeration of silica and improving the mechanical properties of reinforced rubber. The effect of PANI and PANI-SiO2 composites on mechanical properties of hydrogenated nitrile butadiene rubber was studied. The results show that PANI improves the dispersion of SiO2 in HNBR. When the PANI-SiO2 composite (PANI content of 2%) in PANI-SiO2/HNBR is 30 phr, the filler network is the weakest, and the dispersion of filler is the best in rubber, the maximum tensile strength of PANI-SiO2/HNBR is 30.31 MPa, which is 1.87 times that of SiO2/HNBR, the tear strength is 27.7 MPa, which is 129.4% of that of SiO2 reinforced packing with the same number of components. The hardness and elongation at break both increase. In addition, the permanent tensile deformation of PANI-SiO2/HNBR is also reduced.

Automated summary

Polyaniline and polyaniline-silica composites synthesized using chemical oxidation polymerization were studied for their effect on the mechanical properties of hydrogenated nitrile rubber. The results showed that filling the polyaniline-silica composites into the rubber improved the dispersion of silica and enhanced the mechanical properties of the rubber.