A library of acrylate-terminated poly(beta-amino ester)s is synthesized in parallel (see figure and inside cover) via a condensation reaction that combines primary or secondary amines with diacrylates. This library of macromers is then photopolymerized to form networks with a wide range of degradation and mechanical properties. Because of the diversity in properties, these polymers could be developed and screened for numerous applications ranging from microdevices to biomaterials.