Other representative examples of polymers include, but are not limited to, poly(butylmethacrylate-co-2-hydroxyethyl methacrylate) (p(BMA-HEMA)), poly(butylmethacrylate)-co-poly(2-hydroxyethyl methacrylate (PBMA-PHEMA), poly(ethylene glycol) (PEG), poly(ethylene-co-acrylic acid)(PEAA), poly(ethylene-co-glycidyl methacrylate)(PEGMA), EVAL-PEG blends, and other mixtures and combinations thereof.