Abstract:The monomer diallylethylbenzylammonium chloride (DAEABC) was synthesized from diallylethylamine (DAEA) and benzyl chloride in the presence of tiny amount of water, and then used in the synthesis of poly(diallylethylbenzylammonium chloride) (PDAEABC) initiated with 2,2′-azobis(2-methylpropionamide) dihydrochloride in aqueous solution. The structures of PDAEABC were characterized by FT-IR,1H NMR and elementary analysis.Its viscosity behaviors in sodium chloride,potassium chloride,potassium bromide, potassium iodide, magnesium sulfate and sodium sulfate solution were investigated as well. Results show that when V(H2O)∶V(DAEA) is from 0.01 to 0.02, crystalline DAEABC with high purity is obtained in over 94% yield. The reduced viscosity of PDAEABC decreases with the increasing of the concentration of salt. In 0.1 mol/L NaCl solution, it behaves as a polyelectrolyte at below 0.005 g/dL and a neutral polymer at above 0.025 g/dL. The influence order of salts is: Na2SO4＜NaCl＜KCl＜MgSO4＜KBr＜KI. The shielding effect of anion to quaternary ammonium cation is the main reason of the decreasing of reduced viscosity.