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A peroxide‐curable hydrogenated nitrile rubber (HNBR) was modified by in situ crosslinked polyurethane (PU) in a 1 : 1 weight ratio. PU was formed from solid PU precursors, polyester polyol, and blocked polyisocyanate incorporated in the HNBR during the curing of the latter. HNBR/PU blends containing carbon black (CB) of different types (N234, N330, and N550) were prepared in this work. Thirty parts...
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