These co-curable polymers include random and block copolymers of primarily 1,3-addition butadiene or isoprene with styrene, ??-methyl styrene, acrylate or methacrylate, or acrylonitrile monomers; homopolymers or copolymers of ethylene, such as polyethylene, ethylene oxide copolymers; natural rubber; norbomene polymers such as polydicyclopentadiene; hydrogenated styrene-isoprene-styrene copolymers