olymers and the like; polymers derived from ethylenically unsaturated monomers such as polyolefins (e.g., polypropylene and polyethylene including high density polyethylene, linear low density polyethylene, ultra low linear density polyethylene, homogeneously branched, linear ethylene/ ??-olefin copolymers, homogeneously branched, substantially linear ethylene/ ??-olefin polymers, and high pressur