In some aspects, a composition comprising a pH-sensitive crosslinked copolymer of methacrylic acid and poly(ethylene glycol) monomethyl ether methacrylate and a therapeutic protein is provided. In some embodiments, the therapeutic protein is a high molecular weight protein such as factor VIII or factor IX. In some embodiments, the composition is orally administered to a patient to treat a disease or disorder such as, e.g., hemophilia.