Effect of Initiators on Graft Copolymerization of Acrylamide onto Cellulose

The study was conducted regarding the effect of initiators on the graft copolymerization of acrylamide onto masson pine bleached sulfate pulp cellulose,i.e.,ammonium cerium nitrate,potassium persulfate and potassium persulfate/sodium sulfite.It can be concluded that the optimum graft conditions included 0.75 mol/L of the monomer concentration,45℃ of reaction temperature,3 h of the reaction time.Additionally,the ideal initiation dosage of ammonium cerium nitrate and potassium persulfate was 3.0 and 5.0 mmol/L respectively.For the initiator of potassium persulfate/sodium sulfite,the optimum dosage was 6% and the best proportion of potassium persulfate/sodium sulfite was 1.5.Under the above optimum conditions,the grafting percentages of the above initiators were 40%,48% and 60%.In addition,the homopolymer contents of the above three initiators were 5%～7%,17%～30% and 20%～27%,respectively.The results indicate that the grafting efficiency of potassium persulfate/sodium sulfite prevails over ammonium cerium nitrate and potassium persulfate.For the homopolymer content,the ammonium cerium nitrate is less than the other two kind of initiator.