| Abstract: | The reaction of propane sultone with poly(ethylene imine) (PEI) has been studied in benzene and in methanol. The reaction products are polyampholytes insoluble in water or any other solvent, but soluble in strong alkali or in concentrated acids. Depending on the molar ratio PEI: propane sultone, products having a degree of substitution between 0.23 and 0.64 were obtained. After treatment with excess sodium hydroxide and removal of the excess by dialysis, a polymer containing both sodium sulfopropyl groups and sulfopropyl groups in form of inner ammonium salts was obtained. |
