| By using acrylic acid(AA), acrylamide(AM) and 2-acrylamido-2-methyl propanesulfonate(AMPS) as raw materials, potassium persulfate(KPS) and N,N-methylene-bis-acrylamide (NMBA) as initiator and crosslinker respectively, the homopolymer (PAAS), bipolymer(PAA) and terpolymer(PAAMS) were synthesized in aqueous solution. In the experiment of producing PAAS, the relatively optimum polymerization conditions was obtained by orthogonal design and the step-by-step temperature-rising: [M]0=30%；[C]=0.022%；[I]=0.30%； N=75%；T:40℃(1h)→50℃(1h)→60℃(2h)→80℃(1h). The absorbency of PAAS synthesized under this condition was 12001800g.g{-1} in distilled water and 155g.g{-1} in 0.9%NaCl solution respectively.The absorbing properties of PAAS were studied from various aspects, such as different metal cationic, different halogen ions with different radius, different inorganic salt with different concentrations and pH. Both the absorbing rates of PAAS in distilled water, artificial urea and artificial blood and the ability of PAAS's keeping-water were studied. The effect of different molar ratio of AM to AA on the absorbency of the bipolymer(PAA) was studied and the reactivity ratios of AM(r1) and AA(r2) were also calculated with the aim of elemental analysis: r1=0.943, r2=0.791.Monofactor experiment was used to study the effects of thepolymerization conditions on the absorbencies of terpolymer (PAAMS) in tap water and 0.9%NaCl solution including the molar ratio of AMPS to AA to AM, the concentrations of initiator and crosslinker respectively, as well as the neutralizations of AA and AMPS. Finally, a relatively ideal condition for producing PAAMS was obtained.
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