NBR was widely used in a variety of oil products because of its good oil resistance and solvent resistance. With the development of building materials and automobile industry, the requirements of NBR's performance is stricter. As the low tensile strength and elongation at break, the application of NBR is limited. In this paper, we have first synthesized the acrylonitrile-butadiene-isoprene copolymer with the copolymerization of acrylonitrile, butadiene and isoprene. The rate of emulsion terpolymerization, s...