Aqueous copolymer dispersion of acrylamide (AM) and 2-methylacryloylxyethyl trimethyl ammonium chloride (DMC) was synthesized through dispersion polymerization in aqueous solution of ammonium sulfate and a modicum of sodium chloride or lithium sulfate

using poly(acryloylxyethyl trimethyl ammonium chloride) (PDAC) as the stabilizer and the combination of 2

2'-azobis(N

N'-dimethyleneisobutyramidine) dihydro chloride (VA-044) and potassium persulfate (KPS)/formaldehyde sodium bisulfite (SFS) as the initiator.The resultant product was characterized using Fourier transform infrared (FTIR) spectroscopy and H nuclear magnetic resonance (1H-NMR) spectroscopy to evaluate the chemical composition and structure.The results showed that DMC participated in the copolymerization process with AM in accordance with the feeding ratio.Copolymerization progress was monitored with optical microscopy to reveal the particle formation mechanism.Polydisperse spherical particles were formed in the system.The effects of initiator type and concentration

inorganic salts concentration

stabilizer concentration as well as AM/DMC molar feed ratio on the polymerization conversion

the dispersion viscosity

the copolymer molecular weight were systematically studied.The optimum reaction conditions for preparing stable dispersion with good fluidity were concentrations of 28%~32% of ammonium sulfate

1% of sodium chloride or lithium sulfate and 0.5%~1.5% of the stabilizer.