共聚型马来酸酐系减水剂的制备与结构性能的研究  

Research on Preparation,Structure and Properties of Copolymeric Maleic Anhydride Superplasticizer

作　　者：王凌伟[1] 王飞镝[1] 郭宝春[2] 柯晴瑾[1] 赵科明[1] 原霞[1] 

机构地区：[1]广东工业大学轻工化工学院,广州510006 [2]华南理工大学材料学院,广州510640

出　　处：《材料导报》2010年第10期33-36,52,共5页Materials Reports

基　　金：广东省广州开发区科技计划项目(穗开科资[2009]15号)

摘　　要：研究了共聚型马酸酐系减水剂的制备与性能。以马来酸酐和聚乙二醇(PEG)为原料,经酯化制得酯化物单体;并测定其酯化率,用IR表征了酯化物的结构。以马来酸聚乙二醇单酯、2-丙烯酰胺-2-甲基丙磺酸(AMPS)和甲基丙烯酸为原料通过共聚反应制得减水剂,讨论了共聚反应中影响减水剂净浆流动度的因素,并用GPC表征了共聚物减水剂的分子量及分布。将减水剂添加到水泥浆中制得水泥石样品,通过SEM分析了水泥的早期微观结构。结果表明,当n(酯化物)∶n(MAA)∶n(AMPS)=1∶3∶1.5时所得减水剂净浆流动度为265mm,GPC分析表明减水剂平均分子量Mn=12562,分散系数Mw/Mn=2.1361,SEM分析表明减水剂使水泥石大孔减少,生成了更多较小的孔,结晶生长更密实。Preparation and properties of copolymeric maleic anhydride superplasticizer are researched. Super- plasticizer is prepared firstly by esterification of maleic anhydride and polyethylene glycol（PEG）, determination of esterification rate, and esterification of structure are characterized by IR, then, superplasticizer is prepared by copoly- merization of esterification intermediate, 2-acrylamide-2-methyl-propanesulfonic acid（AMPS） and methyl methacrylate. In copolymerization the effects on fluidity of superplasticizer is researched and the molecular weight of copolymers is measured by GPC, the microstructure of cement added with superpalsticizer is characterized by SEM. The results show that the fluidity of the superplasticizer is 265mm at n（Ester） ： n（MAA） ： n（AMPS）= 1 ： 3 ： 1.5, the mean molecular weight（Mn） of the copolymeric superplasticizer is 12562,polydispersity Mw/Mn is 2. 1361, the number of ma-cropores of cement added with the superplaticizers reduce but that of micropores increase, and the crystals grow more dense.

关 键 词：酯化反应 聚羧酸系减水剂 GPC SEM 

分 类 号：O632.12[理学—高分子化学]