Abstract: Polymaleic acid was synthesized in water phase by adopting maleic acid as raw material and H₂O₂ as initiator. Then a novel polycarboxylate superplasticizer of PMA-AA-AMPS was synthesized by using polymaleic acid (PMA), acrylic acid (AA) and 2-acrylamido-2 methyl-propane sulfonic acid as raw materials, ammonium persulfate as initiator in aqueous media. Additionally, the polymerization conditions were optimized. The results indicate that the copolymer can be prepared under such optimum conditions, i.e., 6∶3∶1.2 molar ratio of MA，AA and AMPS，8% of the mass fraction of ammonium persulfate，6% of the mass fraction of formate sodium, 85 ℃ of the polymerization temperature and 3 h of the reaction time. The characterization results of FTIR indicate that the prepared terpolymer contains functional anionic groups such as carboxyl，hydroxyl，sulphonate and amido groups. The number average molecular weight of the PMAAA from GPC is 5 743 g/mol occupying 81.36% of the whole mass fraction.

Key words: Polycarboxylate superplasticizer   , Terpolymer   ,  The fluidity of cement paste  ,    , Water reducing ratio

摘要： 以马来酸酐(MA)为原料,过氧化氢为引发剂,水相合成聚马来酸(PMA),并以过硫酸铵为引发剂,与
丙烯酸(AA),2-丙烯酰胺基-2-甲基丙磺酸(AMPS)水溶液共聚,合成出一种PMA-AA-AMPS三元共聚物高
效减水剂,并探讨了共聚物制备过程中的最佳工艺条件。结果表明,该共聚物的最佳制备条件为:n(MA)/n(AA)/n
(AMPS)=6∶3∶1.2,引发剂质量为单体总质量的8%,分子质量调节剂甲酸钠质量为单体总质量的6%,反应温度
为85℃,反应时间为3h。红外光谱表征结果表明合成的三元共聚物减水剂中含有羧基、羟基、磺酸基和酰胺基等
官能团。GPC分析表明合成的PMAAA数均分子质量Mn 为5743g/mol,其质量分数占81.36%。

关键词: 聚羧酸高效减水剂   , 三元共聚物  ,   ,  水泥净浆流动度 , 减水率