Examples of suchpolymers are polyolefins such as low, medium, and high density polyehtylenes, polypropylene, polybutene-1, poly(dodecamethylene pyromellitimide), ethylene-propylene copolymers, and terpolymers with non-conjugated dienes, fluoropolymers such as the homopolymers of chlorotrifluoroethylene, vinyl fluoride and vinylidene fluoride and the copolymers of vinylidene fluoride-chlorotrifluor