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Aqueous two-phase systems(ATPS)were discovered in 1896.Compared with traditional extraction method like organic solvent extraction,ATPS have low interfacial tension and mild operation conditions.Especially,ATPS are suitable for separation of active bioproducts.In the past decades,a key problem is recovery difficulty of polymers forming ATPS.Since 1990s,researchers have focused on development of intelligent polymers forming recycling ATPS and have some essential progress.