. . "Additional monomeric repeat units, particularly ones comprising relatively polar groups, such as, for example, (1) sulfonamides including but not limited to toluene sulfonamides, benzene sulfonamides, and alkyl sulfonamides; (2) carboxylic acids, carboxylates, or derivatives thereof (such as esters) including but not limited to acrylic acids and acrylates such as butyl acrylate, 2-ethylhexyl acryl" . . .