Kinetics Study on Polymerization of Acrylamide and Dimethyldiallylammonium Chloride

Abstract

The kinetics of polymerization of acrylamide(AM) and dimethyldiallylammonium chloride(DMDAAC) initiated by ammonium persulfate-sodium bisulfate redox complex in aqueous solution was studied.The polymerization rate equation was obtained,and the apparent activation energy and reactivity ratio were measured.The results show that when the polymerization temperature is 45 ℃,n(AM)∶ n(DMDAAC) is 5∶ 5,6∶ 4 and 7∶ 3,the polymerization rate equations are Rp1=kc(M)2.84c(IO)0.51c(IR)0.61,Rp2 =kc(M)2.77c(IO)0.51c(IR)0.59 and Rp3=kc(M)2.73c(IO)0.50c(IR)0.56.The apparent activation energies are Ea1=90.61 kJ/mol,Ea2=88.88 kJ/mol and Ea3=85.15 kJ/mol,respectively,while the reactivity ratios of AM and DMDAAC are rAM=6.11,rDMDAAC=0.14.The kinetics results could explain the difference of copolymerization rate and intrinsic viscosity of poly(DMDAAC-co-AM)(PDA) with different cationicities.