These polymers include polyolefins such as low, medium and high density polyethylenes and polypropylenes, poly(butene-1), poly(dodecamethylene pyromellitimide), ethylenepropylene copolymers and terpolymers with nonconjugated dienes, poly(vinylidene fluoride), vinylidene fluoride-tetrafluoroethylene copolymers, etc.