Such polymeric materials include, but are not limited to, polyolefins such as polyethylene and polypropylene, polyisobutylene and ethylene-alphaolefin copolymers, silicone polymers such as polydimethylsiloxane; acrylic polymers and copolymers, such as polyacrylate, polymethylmethacrylate, polyethylacrylate; vinyl halide polymers and copolymers, such as polyvinyl chloride; fluoropolymers such as po