| Using acrylamide(AM) as the molecular backbone, acrylic acid(AA) as anionic monomer, and dimethyl diallyl ammonium chloride (DMDAAC) as the cationic monomer, complex of KPS and azo-compounds AIBA·2HCl as initiator, the water-soluble polyampholyte P(AM-DMDAAC-AA) was prepared in the aqueous solution. The influences of monomer concentration, dosage of initiator and monomer molar ratio on intrinsic viscosity and adsorption property of Ca2+ of the polyampholyte were investigated. The optimal conditions were found as follows: n(AM)∶n(DMDAAC)∶n(AA)=1∶0.3∶0.8, monomer concentration 22.5%, dosage of initiator 0.2%, while mass ratio of KPS and AIBA·2HCl 3∶1, reaction temperature 70~75℃, reaction time 10 h. Under these conditions, intrinsic viscosity of the polyampholyte was 231.48 mL/g, maximum adsorption capacity of Ca2+ was 2.028 mmol/g. The structure of the polymer was characterized and studied by the FT-IR and 1H-NMR. |
