Dispersion copolymerization of acrylamide(AM)and N

N—dimethylaminoethyl methacrylate methyl chloride quatemary salt(DMC)has been carried out in aqueous solution of ammonium sulfate in the presence of poly(acryloylxyethyltrimethyl ammonium chloride)(PDAC)as polymeric stabilizer using 2

2'-azobis[2-(2-inidazolin．2-yl)propane]-dihydro chloride(VA-044)as the initiator．The results showed that varying the stabilizer concentration in a range from 6 wt％to 14 wt％

a minimum of average particle size was obtained at the stabilizer concentration of 10 wt％．When fixing stabilizer concentration as a constant

the average particle size decreased with increasing the average molecular weight of stabilizer．Ammonium sulfate has great effect on the dispersion polymerization

and only in a narrow range of concentrations of the inorganic salt and the monomer

particles with smooth edge(good morphology)can be obtained．The molecular weight of the polymer obtained decreases with increasing the ammonium sulfate concentration．