温度对不同酯类聚羧酸接枝共聚物性能的影响  

Influence of temperature on properties of different ester-type polycarboxylate graft copolymers

作　　者：周栋梁[1,2] 冉千平[1,2] 江姜[1,2] 刘加平[1,2] 缪昌文[1,2] 

机构地区：[1]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,南京210008 [2]江苏博特新材料有限公司,南京210008

出　　处：《东南大学学报（自然科学版）》2010年第A02期133-137,共5页Journal of Southeast University：Natural Science Edition

基　　金：江苏省建筑业科研资助项目(JGJH2009-11);国家重点基础研究发展计划(973计划)资助项目(2009CB633205)

摘　　要：在5,20,30℃环境下测试了温度对2种酯类聚羧酸接枝共聚物在水泥浆体中的分散和吸附性能的影响,讨论了吸附量与分散性能之间的关系.实验结果表明:温度对接枝共聚物性能的影响非常明显,甲基丙烯酸(MAA)主链接枝聚合物(PC1)有更好的分散性能,丙烯酸(AA)主链接枝共聚物(PC2)在分散方面表现出更大的温度敏感性;PC1在水泥颗粒表面的吸附量要大于PC2;PC2在高温条件下出现吸附量降低的异常现象,证明了聚合物分子出现了部分的结构破坏,而PC1并未出现这个现象;PC2在低吸附量的条件下就能达到较大的分散度,对水泥颗粒的分散效率高于PC1.The effects of temperature on dispersion and adsorption behavior of two kinds of polycarboxylate graft copolymers were investigated at 5℃,20℃,30℃ and the relationship between absorbed amount and dispersability was analyzed.The results show that,the properties of graft copolymers depend remarkably on temperature,MAA（methacrylic acid） main chain copolymer（PC1） has better dispersion properties and the dispersability of AA（Acrylic acid） main chain copolymer（PC2） has higher temperature sensitivity.The adsorbed amount of PC1 is larger than PC2 on the cement particles at any temperatures.The adsorbed amount of PC2 decreases significantly at temperature up to 30℃,which proves that higher temperature influences the structural stability of PC2,but does not significantly affect the molecular structure of PC1.It is also found that PC2 exhibits excellent dispersability in lower adsorbed amount,and PC2 has better dispersion efficiency to cement particles than PC1.

关 键 词：聚羧酸接枝共聚物 主链化学结构 温度敏感性 分散性能 吸附动力学 

分 类 号：TU528[建筑科学—建筑技术科学]