The Swelling Properties of Nitrile Rubber with Different Acrylonitrile Contents in Cyclohexane Medium Research

Abstract

By the research of swelling and mechanical properties of nitrile rubber with different acrylonitrile contents in cyclohexane medium, the influences of physical and mechanical properties with diffrent acrylonitrile contents is analyzed. The results indicated that: the quality of all the nitrile-butadiene rubbers with different acrylonitrile contents is increasing with the increase of soaking time. It increases rapidly in the first 24 hours then gently. With the increase of the acrylonitrile content, the increasing proportions of swilling quality is reduceing. But N40 cyclohexane performance is better relatively. After drying the three kinds of rubber in 110 degrees Celsius, all the qualities is lower than the original value. It means that in swelling process, the material in rubber is pulled out and the distance between the rubber molecules decreases. After swilling the three kinds of rubber, their hardness decreases and the decline proportion is reducing by the increase of acrylonitrile content. With different acrylonitrile contents and swilling times the nitrile rubber shows different mechanical properties. After soaking three kinds of rubber their tensile strengthes are on the decline by swilling time and their rates of permanent deformation are on the rise. It shows that as the swelling time extended, the mechanical properties descends and the corresponding indicators after soaked and dried is lower than the quantitative values after soaked. The study has a certain reference of design of ESPCP stator under certain operating conditions.