Rubber, nitrile, uses

The nitrile rubber used for the experimental studies contained 40% acrylonitrile and the values of k, I, m, and n for the elastomer were calculated from spectroscopic studies as 359, 559, 215, and 770, respectively. 

There are numerous nitrile rubbers used in cement and adhesive applications, although some general trends may be noted ... 

Another example of a structural adhesive is a two-part solventless liquid system. One part contains carboxylated nitrile rubber, methyl methacrylate, and cobalt naphthenate. The second part is composed of carboxylated nitrile rubber, methyl methacrylate, and cumene hydroperoxide. In this example the carboxylated nitrile rubber used was Hycar 1072." ... 

DN1201 35 72.5 2.5 0.98 C NS ACN/BR/IR terpolymer. Has better t y cals and processing than conventional nitrile rubber. Used for rolls, diaphragms, and lubber thread... 

The structure and vulcanisation mechanisms of carboxylated rubbers in general are discussed, and results are presented of a study of the vulcanisation of carboxylated nitrile rubber using four different curing systems. The crosslink density, tensile and dynamic mechanical properties, stress relaxation and tear strength of vulcanised samples were investigated. 22 refs. 

An example of this type of a safer chemical is methacrylonitrile (1) compared with acrylonitrile (2) (Figure 1.1). Both compounds are a, 3-unsaturated aliphatic nitriles, and structurally very similar, but 2 causes cancer whereas 1 does not appear to do so. Among other applications, 2 is used in the production of acrylic and modacrylic fibers, elastomers, acrylonitrile-butadiene-styrene and styrene-acrylonitrile resins, nitrile rubbers, and gas barrier resins. In a study conducted by the US National Toxicology Program (NTP) in which 2 was administered orally to mice for 2 years, there was clear evidence that it caused cancer in the treated mice (in addition to causing other toxic effects), and is classified by the NTP as a probable human carcinogen [26]. 

Nitrile rubber (former US acronym) (see also NBR) Styrene-butadiene rubber (former US acronym see PBS, SBR)... 

Black, L.E. 1989. Aromatics-non aromatics separation by permeation through thermally crosslinked nitrile rubber membranes. US 4885096. 

In a patent issued to the US Army in the late 1980s, the zinc salts of acrylic acid and methacrylic acid were used to upgrade the properties of hydrogenated nitrile rubber (HNBR) [3]. The goal of this work was to develop abrasion-resistant materials that could be used to extend the service life of tank treads. Zinc dimethacrylate (ZDMA) proved to be the best material in the study for improving the tear strength, abrasion resistance, and high temperature performance of HNBR. 

It is claimed that the development of a nitrile rubber-based compound for battle tank track pads could save the US Army million of dollars in maintenance costs. Researchers at the Army Materials Research Laboratory and Belvoir Research Development Engineering Centre developed a highly saturated nitrile rubber compound in 1987 in an attempt to make the pads, currently moulded in SBR, wear longer. Details are given. 

GR-A Former US symbol for nitrile rubber see H-NBR Hydrogenated nitrile rubber... 

Ladd. E.C.. Alkyl esters of phosphono bis P-cyanoethylacetic acid and acetic acid nitrile, U.S. Rubber, U.S. Patent Appl. US 2632019. 1953 Chem. Abstr, 48, 1418b, 1954. 

The failure of rubber parts used in domestic water applications has been reported flem several US states. The complaints involved swelling and cracking and are related to nitrile and ethylene-propylene copolymer type compoimds. The failure of the rabber parts coincides with the implementation and use of chloramines as a method of water purification. This investigation was designed to determine if EPDM composition variables influenced resistance to chloramines. Also evaluated were peroxide vs sulphur cure systems, the effect of antioxidants and whether practical compoimds can be developed for water systems. 5 refs. 

---