Abstract
Nitrile-butadiene rubber is the sealing material of isopropyl nitrate; however, leakage or vaporization phenomena frequently occur. In order to analyze the causes of leakage and volatilization and study on the various properties of nitrile-butadiene rubber after the swelling of isopropyl nitrate, the author prepared nitrile rubber which contained 20%, 30% and 40% of acrylonitrile respectively, the quality and volume change rate, surface topography, organization structure, mechanical properties of the swollen nitrile rubber were tested separately. The results showed that the mass and volume of nitrile-butadiene rubber increase greatly after swelling; The higher the acrylonitrile content is or the higher the temperature is, the more obvious the swelling effect will be; Small molecules like plasticizers in nitrile-butadiene rubber will be precipitated during swelling process; The mechanical properties of the nitrile rubber decrease severely after swelling. The main cause of swelling lies in the similarity of polarity between NBR and isopropyl nitrate, and it becomes hard for the nitrile rubber to meet the sealing requirements.
