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SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013 A series graft copolymers consisting of poly(ethyleneimine)(PEI)main chains and AMPS: 2-Acrylamido-2-methylpropanesulfonic Acid(AMPS)or 2-Acrylamido-2-methylpropanesulfonic Acid Ammonium Salt(AMPSa)side chains has been synthesized.