分子量及其分布对聚羧酸减水剂吸附行为的影响(英文)  

Effects of Molecular Mass and Its Distribution on Adsorption Behavior of Polycarboxylate Water Reducers

作　　者：李顺[1] 余其俊[1] 韦江雄[1] 季亚军[1] 

机构地区：[1]华南理工大学材料科学与工程学院,特种功能材料教育部重点实验室,广州510640

出　　处：《硅酸盐学报》2011年第1期80-86,共7页Journal of The Chinese Ceramic Society

基　　金：国家“973计划”(2009CB623104);华南理工大学自然科学青年基金(E5090950)资助项目

摘　　要：从分子量及其分布角度研究聚羧酸系减水剂在水泥颗粒表面的吸附行为,分析了聚羧酸减水剂的吸附行为对其分散性、保坍性的影响。结果表明:平均分子量较高的减水剂在水泥表面的吸附量较高,减水剂分子中的高分子量部分优先吸附在水泥颗粒表面;对于同一减水剂,随其在水泥表面的吸附量增加,浆体的流动度增加,两者之间呈正相关性;而对于不同减水剂,吸附量与流动度之间的相关性较差。聚羧酸系减水剂在水泥、粉煤灰、矿渣等胶凝材料表面吸附行为的对比分析,有利于指导聚羧酸减水剂的分子设计,从而提高其与复合水泥之间的相容性。The adsorption behavior of polycarboxylate water reducers（PCs） on the surface of cement particle was investigated via the respect of molecular mass and its distribution.The effect of adsorption behavior of PCs on the dispersibility and dispersion retention capability was analyzed.The results show that adsorption amount of PCs with a higher average molecular mass on the surface of ce-ment particle is higher than that of PCs with a lower molecular mass.The PCs fractions with a high molecular mass adsorb preferen-tially on the surface of cement particle.For the same PCs,the fluidity of cement paste increased with increasing the adsorption amount on the surface of cement particles,and the fluidity of cement paste was correlated to adsorption amount of PCs.For the dif-ferent PCs,however,the correlation was poor.The studies on the different adsorption behaviors of PCs on the surface of cement,fly ash and ground granulated blast-furnace slag（GGBFS） could favor the design of molecular structure and the improvement of the compatibility between PCs and composite cement.

关 键 词：聚羧酸减水剂 分子量及其分布 吸附 分散性 

分 类 号：TQ172[化学工程—水泥工业]