LOW-TEMPERATURE PROPERTIES OF HYDROGENATED NITRILE RUBBER (HNBR)

The low-temperature flexibility of ordinary NBR varies in inverse proportion to its acrylonitrile content. Therefore, low-acrylonitrile NBR has better low-temperature flexibility than high-acrylonitrile NBR. The low-temperature properties of HNBR are different than those of NBR. This paper will show the relation between the acrylonitrile content and degree of hydrogenation and the glass-transition temperature (Tg) and low-temperature flexibility of HNBR. This paper also describes the effects of polymer composition and of various plasticizers on the low-temperature flexibility of HNBR.