建筑用梳形共聚物分散剂溶液行为的光散射研究  

SOLUTION BEHAVIOR OF COMB-LIKE COPOLYMER DISPERSANTS PROBED BY LASER LIGHT SCATTERING

作　　者：熊洁[1] 王建祖[1] 冉千平[2] 安英丽[1] 张珍坤[1] 史林启[1] 

机构地区：[1]功能高分子材料教育部重点实验室南开大学高分子化学研究所,天津300071 [2]江苏省建筑科学研究院有限公司,南京210008

出　　处：《高分子学报》2013年第6期750-754,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21274067;51278232);天津市应用基础与前沿技术研究计划(自然科学基金)/青年基金(基金号12JCQNJC01800)资助项目

摘　　要：采用激光光散射研究了一种主链为聚丙烯酸侧链为聚乙二醇的梳形共聚物分散剂的一些溶液行为.从静态光散射得出了较为合理的表观重均分子量、均方旋转半径等参数.动态光散射给出了流体力学半径分布及其角度和浓度依赖性.结合静态和动态光散射,上述梳形共聚物分散剂在溶液中的构象也得到初步的表征.通过与描述梳形聚合物的Gay-Raphae模型进行比较表明,这类梳形共聚物溶液在低盐离子和低pH值条件下存在聚集行为,形成以PAA主链为核PEG为壳层的类胶束聚集.The solution behavior of a newly developed comb-like polymer-based dispersant was investigated by laser light scattering （LLS） with a focus on the conformation of the chain in solution. By static light scattering, reasonable parameters, such as weight-averaged molecular weight （M） and mean square radius of gyration 2 （ 〈 Rg^2 〉 ） were obtained. Furthermore, apparent intensity-weighted hydrodynamic radius distribution and its dependence on the concentration and scattering angle were investigated by dynamic light scattering. By comparing the results from LLS with the popular Gay-Raphae model of comb-like polymers,it is suggested that there might be aggregation behavior and the current comb-like polymers exist in solution as micellar aggregates.

关 键 词：梳形共聚物 高性能减水剂 光散射 混凝土 溶液构象 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]