A poly (β- alanine ) macromer with acrylamido - chain- end was synthesize.Its molecular weight was obtained by end-group titration and IH-NMRmeasurement
and its branching degree was measured by 13C-NMR and NaOHhydrolysis method. Copolymerization of acrylamide and sodium acrylate with thepoly (β- alanine) macromer in aqueous solutions by using a ferrous sulfate/cumenehydroperoxide redox initiation system resulted in formation of poly(acrylamide - co - sodium acrylatc ) - g - poly (β- alanine) graft copolymers
the composition of whichwas determined by 1H-NMR and titration. The solution properties show that the graft copolymers with higher poly (β-alanine) content exhibit better viscosity retentionin brine and high storage stability
compared with partially hydrolyzed polyacrylamide (HPAM).