1.同济大学 先进土木工程材料教育部重点实验室， 上海 201804;2.同济大学 材料科学与工程学院， 上海 201804;3.上海市水务局城市管网智能评估与修复工程技术研究中心， 上海 201900
孙振平（1969—），男，新疆奇台人，同济大学教授，博士生导师，博士.E-mail：szhp@tongji.edu.cn
杨海静（1991—），女，宁夏石嘴山人，同济大学博士后，博士.E-mail：yanghaijings@tongji.edu.cn
TU521.3
国家自然科学基金资助项目（52278272，52108240）；上海市科委科技项目（23DZ1203500）；上海市建委专项课题（住建管2021-001-002）；重庆市科技局专项项目（cstc2020kqjscx-phxm1594）；内蒙古自治区科技计划项目（2022YFDZ0063）；云南省科技厅专家工作站项目（202105AF150243）
SUN Zhenping
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China;School of Materials Science and Engineering，Tongji University，Shanghai 201804，China;Research Center of Intelligent Evaluation and Restoration Engineering Technology of Urban Pipe Network of Shanghai Water Bureau， Shanghai 201900， China1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China;2.School of Materials Science and Engineering，Tongji University，Shanghai 201804，China;3.Research Center of Intelligent Evaluation and Restoration Engineering Technology of Urban Pipe Network of Shanghai Water Bureau， Shanghai 201900， China
利用丙烯酸甲酯、丙烯酸羟乙酯和丙烯酸羟丙酯合成了含不同酯基官能团的聚羧酸系减水剂（PCE），通过测试水泥净浆流动度、PCE在水泥净浆中的吸附量和水解率，研究了不同酯基官能团对PCE缓释保塑效应的影响及机理.结果表明：含不同酯基官能团的PCE尽管在改善水泥净浆初始流动度方面效果有限，却均能大幅提升水泥净浆的经时流动度；不同酯基官能团在水泥净浆液相碱性环境下的水解速率不同，其释放的羧酸基团数量存在差异，进而影响了PCE在水泥颗粒表面的吸附量，最终产生了不同的缓释保塑效应.
Polycarboxylate ether-based superplasticizers（PCE） with different ester functional groups were synthesized using methyl methacrylate， hydroxyethyl acrylate and hydroxypropyl acrylate. The influence and mechanism of different ester functional groups on the slow release and plasticizing retention effect of PCE were studied by testing the fluidity of cement paste as well as the adsorption amount and hydrolysis rate of PCE in cement paste. The results show that although the initial fluidity of cement paste mixed with PCE containing different ester functional groups does not increase obviously， the fluidity retention is improved significantly. Furthermore， due to the different hydrolysis rate of ester functional groups， the number of carboxylic acid groups release varies， which in turn affects the adsorption amount of PCE on cement particles， ultimately resulting in a different slow release and plasticizing retention effect.
孙振平,杨海静,吴乐林,袁禁,邹爽.含不同酯基官能团
