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 was 45 ℃, n(AM)∶n(DMDAAC) was 5∶5, 6∶4 and 7∶3, the polymerization rate equations were 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 were 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 were 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.

Key words: acrylamide, dimethyldiallylammonium chloride, polymerization kinetics, polymerization rate equation, apparent activation energy, reactivity ratio