Hydrogenated acrylonitrile-butadiene copolymers NBR

Pyrograms of NBR samples at 550 °C before and after hydrogenation (a) N-37(0), (b) N-37(440), and (c) N-37(98). Table 5.9 summarises the characteristic thermal degradation products observed on the pyrograms of NBR and hydrogenated NBR. Mass spectral data of the characteristic degradation products enabled many of them to be identified. 

Reproduced with permission from T. Yamada, T. Okumoto, H. Ohtani and S. Tsuge, Rubber Chemistry and Technology, 1990, 63, 2,191. 1990, ACS Rubber Division  

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. 

4-butadiene unit A = acrylonitrile E = hydrogenated 1,4-butadiene unit.  

Reproduced with permission from A. Kondo, H. Ohtani, Y. Kosugi, S. Tsuge, Y. Kubo, N. Asada, H. Inaki and A. Yoshioka, Macromolecules, 1988, 21, 10, 2918. 1988,  

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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. 

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