HYDROGENATED ACRYLONITRILE

FIGURE 13.2 Calculated relation between the solubility parameter and glass transition temperature (Jg) for a variety of ethylene-propylene copolymers (EPMs) grafted with polar monomers the window for rubbers with an oil resistance similar to or better than hydrogenated acrylonitrile-butadiene copolymer (NBR) (20 wt% acrylonitrile) is also shown. 

Das et al. (2005) examined the electron-beam processing of hydrogenated acrylonitrile-butadiene rubber sheets. The gel content and dynamic storage modulus increased with the radiation dose. 

Di-n-propylamine can be produced in industrial scale by the alkylation of ammonia with n-propanol on Ba(OH)2 modified Ni/Al203 catalyst [2], by the reductive amination of propionaldehyde over a cobalt-containing catalyst [3] or by the hydrogenation acrylonitrile in n-exane on Ni/Al203 catalyst [4,5]. However, only scare data is available about the alkylation of ammonia or i-butylamine with i-butanol [6-10]. Di-i-butylamine was prepared from i-butanol over alumina at 370-380 C with 28 % yield [7]. 20 wt% Co - 5 wt% Ni catalyst supported on alumina was used to prepare di-i-butylamine fi"om i-butanol and i-butylamine at 200 °C with a yield of 60. 6 [10]. Aliphatic mixed secondary amines prepared from a pimary amine and an alcohol were usually obtained on copper-containing catalysts at 190-200 C with 30-50 % yields [11-13]. 

HNBR Hydrogenated acrylonitrile-butadiene rubber (highly saturated nitrile... 

Zhang, J., Wang, L., Zhao, Y. Impoving performance of low-temperature hydrogenated acrylonitrile butadiene rubber nanocomposites by using nano-clays. Mater. Des. 50, 322-331 (2013)... 

Hydrogenated acrylonitrile-butadiene robber (HNBR)-Therban 3407, containing 34 % of acrylonitrile units and residual double bonds max 0.9 %, Mooney viscosity 70 was purchased from Lanxess. Dicumyl peroxide obtained from Aldrich was used as cross-linker. Co-agents consisted of nanostructured metal oxides magnesium, zinc or calcium oxide provided by Aldrich and unsaturated acids acrylic acid (Aldrich) or monoallyl maleate (synthesized by Department of Organic Chemistry- Technical University of Lodz). The composition of a typical elastomer blend was HNBR-100 phr, DCP- 3 phr, metal oxide- 3 phr, unsaturated acid-1 phr. 

Bik, J. M., Rzymski, W. M., Gluszewski, W., Zagorski, Z. R (2004). Electron Beam Crosshnkmg of Hydrogenated Acrylonitrile-Butadiene Rubber. Kaut. Gummi Kunstst,... 

Gatos KG, Karger-Kocsis J (2007) Effect of the aspect ratio of siheate platelets on the mechanical and barrier properties of hydrogenated acrylonitrile butadiene rubber (HNBR)/layeted silicate nanocomposites. Eur Polym J 43 1097-1104... 

Yamada and co-workers [59] pointed out that spectroscopic methods such as IR spectroscopy and NMR spectroscopy previously used in sequencing studies on ethylene-propylene-diene and hydrogenated acrylonitrile butadiene rubbers often encountered the same difficulties experienced with the analysis of vulcanised rubbers, i.e., their insolubility. 

The peak intensity of the unsaturated hydrocarbon Cy-MN(A) i.e., CH2 = CH(CH2)4 - C = N obtained by Py-GC provided a practical calibration curve applicable to ever highly hydrogenated acrylonitrile-butadiene copolymers. 

Tian M, Su LL, Cai WT, Win S, Chen Q, Fong H, Zhang LQ (2011) Mechanical properties and reinfoFctanent mechanisms of hydrogenated acrylonitrile butadiene rubber composites containing fibrillar silicate nanofibers and short aramid microfibers. J Appl Polym Sci 120 1439-1447... 

LTG-HNBR Low-temperature-grade hydrogenated acrylonitrile butadiene rubber... 

Hydrogenated Acrylonitrile Butadiene Rubber HNBR Hydrogenated Nitrile Rubber... 

The modified fillers were used in two matrices with different polarity the ethylene-propylene copolymer EPM and hydrogenated acrylonitrile-butadiene rubber HNBR. Elastomers were crosslinked with dicumyl peroxide DCP. The influence of the variously modified fillers on the cross-linking density of the vulcanizates, rheometric and mechanical properties of filled systems were investigated. The ageing studies (thermal, atmospheric and under UV radiations) were conducted. 

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