The present disclosure provides sulfhydryl-modified polymer foams, which may be used for wound dressing materials. For example, the modified materials can include free sulfhydryl group, which can serve as a linker to attach biologically active molecules. For example, sulfhydryl groups can be used to conjugate biologically active polypeptides and/or metals to foam polymers. Methods for using sulfhydryl-modified polymers, such as for wound dressings, are also provided.