嵌段聚羧酸侧链长度对水泥浆体分散性能的影响  

Effect of Side Chain Length in Block Polycarboxylateon Dispersion Properties of Cement Paste

作　　者：乔艳静 江姜 张霞 王秀梅 QIAO Yan-jing;JIANG Jiang;ZHANG Xia;WANG Xiu-mei(Nanjing Bote New Materials Co.Ltd.,Jiangsu Nanjing 210047;Jiangsu Sobute New Materials Co.,Ltd.,Jiangsu Nanjing 211103,China)

机构地区：[1]南京博特新材料有限公司,江苏南京210047 [2]江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《广州化工》2021年第15期108-110,共3页GuangZhou Chemical Industry

基　　金：杰出青年项目基金(51825203)资助项目。

摘　　要：采用可逆加成-断裂链转移聚合成功制备了主链与侧链重量比相一致,重均分子量相当的,仅侧链长度不同的嵌段结构聚羧酸(PC)。系统的研究了不同侧链长度的嵌段结构PC对水泥基材料分散性能、吸附性能以及溶液构象的影响规律,结果表明:随着侧链长度的增加,嵌段PC在水泥表面的吸附量增加,流体力学半径变大,蜷缩的溶液构象导致其在水泥基材料表面单位占有面积减小,因而其对水泥的分散性能呈现先增加后减小的趋势。Block polycarboxylate(PC),with the same main chain to side chain weight ratio,same weight average molecular weight(M w),but different side chain lengths,was successfully prepared through reversible addition-fragmentation chain transfer polymerization.The effect of block PC with different side chain lengths on the dispersion performance of cement was systematically studied through dispersion properties,adsorption properties and solution conformation.The results showed that with the increase of side chain length,the adsorption amount of block PC increased,the hydrodynamic radius became larger,indicating that the curled solution conformation which led to a decrease in the unit area occupied by surface area.Consequently,the dispersion properties increased first and then decreased.

关 键 词：嵌段聚羧酸 侧链长度 吸附性能 分散性能 

分 类 号：TU528[建筑科学—建筑技术科学]