文献类型：期刊文献

中文题名：聚羧酸超塑化剂稳定分散石膏浆体的研究

英文题名：Study of Dispersing Effects of Polycarboxylate Superplasticizers on Gypsum Particles

作者：傅乐峰[1];邓最亮[2];张毅[2];林珩[1];郑柏存[1];杨振乾[2];于建国[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237;[2]上海三瑞化学有限公司,上海200237

年份：2010

卷号：13

期号：5

起止页码：589

中文期刊名：建筑材料学报

外文期刊名：Journal of Building Materials

收录：CSTPCD;;EI(收录号：20105013479850);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：上海市优秀学科带头人计划项目(08XD14229);上海市科技启明星计划项目(07QB14048)

语种：中文

中文关键词：聚羧酸;接枝共聚物;吸附;石膏

外文关键词：polycarboxylate; grafted copolymer ; adsorption; gypsum

摘要：研究了甲基丙烯酸-甲氧基聚乙二醇甲基丙烯酸酯共聚物(MAA-MPEGMA)、马来酸酐-烯丙基聚乙二醇醚共聚物(MA-APEG)、丙烯酸-烯丙基聚乙二醇醚共聚物(AA-APEG)这3种梳形聚羧酸接枝共聚物以及丙烯酸均聚物(PAA)对石膏粉体的分散性能.结果表明:聚合物侧链长度越短、相对分子质量越小、电荷密度越高,对石膏的分散性能越好,同时凝结时间也越长;聚羧酸共聚物能够改善石膏硬化体的微观结构和孔结构.掺加聚羧酸共聚物后显著降低了石膏硬化体的孔隙率;但是也明显增大了石膏硬化体的平均孔径和孔径分布.红外光谱分析表明,聚羧酸共聚物在石膏颗粒表面的吸附是一种化学吸附.3种共聚物对石膏的吸附强度顺序是:马来酸共聚物>丙烯酸共聚物>甲基丙烯酸共聚物.
Dispersing effects of comb-type polycarboxylate grafted copolymers such as methacrylic acid methoxy polyethylene glycol methacrylate（MAA-MPEGMA） copolymers, maleic acid-polyethylene glycol allyl ether （MA APEG） copolymers and acrylic acid-polyethylene glycol allyl ether（AA-APEG） copolymers, and polyacrylic acid （PAA） homopolymer on gypsum particles were studied. Better dispersing effects and longer set time are achieved by adding the polymers with short side-chain length,low molecular weight or high density of electric charge. Polycarboxylate copolymer can significantly improve microstructure and pore structures of hydrated gypsum. Polycarboxylate copolymer can decrease porosity but increase pore size and distributions. IR analysis indicates that surface complexes and chemical adsorption are formed by functional groups -COO in carboxylate copotymers and Ca^2＋ on particle surface. The binding strength of different copolymers on gypsum particle surface has following sequence：maleic copolymer）acrylic copolymer）methacrylic copolymer.