Copolymerization of dimethyl diallyl ammonium chloride and acrylamide by using AIBA·2HCl-NaHSO_3 initiator and characterization
By using AIBA·2HCl-NaHSO_3 initiation system,a serie s of high intrinsic viscosity copolymers of dimethyl diallyl ammonium chloride(D MDAAC) and acrylamide(AM) were prepared in aqueous medium under different condit ions.The effects of various factors such as initiator concentration, pH of solut ion, composite initiator and the way of feeding AM etc.on the copolymerizati on of dimethyl diallyl ammonium chloride and acrylamide were studied. The result s indicated that copolymerization could be initiated at a low temperature.A t 30℃,n_AM∶n_DMDAAC=4∶1,ω(monomer)=30%,c (AIBA·2HCl)=1.0×10-4 mol·L-1,when the monomer solution was po lymerized at pH=7.0,the intrinsic viscosity of PDMDAAC-AM was 11.56 dl·g -1;when the monomer solution was polymerized at pH=10.0,the intrinsi c viscosity of copolymer was up to 13.60 dl·g-1.If continuous feeding of AM was used , the cationicity and intrinsic viscosity of copolymer could attain 38.8% and 11.61 dl·g-1.Furthermore, the monomer reactivity ratios and apparent activation energy of the polymerization system were determin ed. At 30 ℃, initiated by AIBA·2HCl-NaHSO_3 initiator, the reactivity ratios of DMDAAC and AM were 0.174 and 6.800,respectively, and the apparent activation energy was 33.25 kJ·mol-1.