摘   要： 以甲氧基聚氧乙烯（MPEO，聚合度n＝23）和甲基丙烯酸甲酯为主要原料，通过酯交换合成了甲氧基聚氧乙烯甲基丙烯酸酯（MPEOMA），调节催化剂、阻聚剂及合成条件，酯交换率可达到98％. MPEOMA与丙烯酸等单体通过调节共聚合方法制备了两种新型聚羧酸系减水剂，用傅立叶变换红外光谱测定及表征了其分子结构，并研究了反应条件对水泥塑化效果的影响。结果表明，以2-丙烯酰胺-2-甲基丙磺酸(AMPS)提供磺酸基的减水剂具有良好的分散性及分散保持性能，折合成固掺量为0.3%、水灰比为0.29时，水泥净浆流动度可达295mm，且90min内流动度基本不变。

Abstract: A methoxy poly(ethylene oxide) methacrylate (MPEOMA) macromonomer has been synthesized with methyl methacrylate and methoxy poly(ethylene oxide) monoether (MPEO, n=23) by means of transesterification and under controlling of catalysts, inhibitors and suitable synthesis conditions. The transesterification rate is able to reach about 98%. Two types of polycarboxylic superplasticizer P-1 and P-2 are copolymerized from acrylic acid, α-methylacrylic acid，sodium allylsulfonate or 2-acrylamido-2-methyl propane sulfonic (AMPS). The structures are characterized by FTIR and their plasticized effect on cement paste are also investigated. The results show that the superplasticizer made from AMPS has a higher dispersing ability and lower loss of flowability. The fluidity of cement paste can attain as high as 295 mm by add the comb-like polymer 0.3% and when water-cement ratio is 0.29, and there is still no change on the flowability during the 90 minutes.