The free radically polymerizable ethylenically-unsaturated monomers of the first polymer (having a plurality of pendent polymerizable functional groups) may comprise any of the free radically polymerizable ethylenically-unsaturated monomers, examples of which include one or more of the vinyl aromatic monomers such as styrene, ??-methylstyrene, 2-and 4-vinyl pyridine, and the like; ??,??-unsaturate