Copolymerization of starch grafting acrylamide in aqueous two-phase by initiator of APS/NaHSO_3

The copolymerization of the starch grafting acrylamide was studied in aqueous two-phase of PEG as dispersion medium and(NH4)2S2O8(abbreviation APS)/NaHSO3 initiation system as initiator.The effect of initiator concentration,the ratio of initiator,temperature and preparatory initiation time on copolymerization was investigated.The optimum conditions are as follows: PEG mass fraction for 10%,n[(NH4)2S2O8]∶n(AM)=0.001 2∶1,n[(NH4)2S2O8]∶n(NaHSO3)=1∶2.0,30 ℃,preparatory initiation time 10 min,reaction time 9 h.Under these conditions,the production of monomer conversion is 95.39%,grafting ratio is 113.03%,grafting efficiency is 63.91%.