nitrile rubber | 農藥百科
nitrilerubber(NBR),alsocallednitrile-butadienerubber,anoil-resistantsyntheticrubberproducedfromacopolymerofacrylonitrileandbutadiene.
nitrile rubber (NBR), also called nitrile-butadiene rubber, an oil-resistant synthetic[1] rubber[2] produced from a copolymer[3] of acrylonitrile and butadiene[4]. Its main applications are in fuel hoses, gaskets, rollers, and other products in which oil[5] resistance is required.
In the production of NBR, acrylonitrile (CH2=CHCN) and butadiene (CH2=CH-CH=CH2) are emulsified in water and then polymerized[6] (their single-unit molecules linked into large, multiple-unit molecules) through the action of free-radical initiators. The amount of acrylonitrile present in the final copolymer varies from 15 to 50 percent. With increasing acrylonitrile content the rubber shows higher strength, greater resistance to swelling by hydrocarbon oils, and lower permeability to gases. At the same time, however, the rubber becomes less flexible at lower temper...