RAFT法制备嵌段型聚羧酸减水剂及其水化性能  

Preparation of Block Polycarboxylic by RAFT and Its Hydration Properties

作　　者：李东旭 陈洋[2] 周生态 梁梅[2] 邹华维[2] 王军 陈景 LI Dong-xu;CHEN Yang;ZHOU Sheng-tai;LIANG Mei;ZOU Hua-wei;WANG Jun;CHEN Jing(Guizhou Science Research and Design Institute of CSCES,Guiyang 550006,China;Polymer Research Institute,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;China West Construction Group Co.,Ltd.,Chengdu 610017,China;China West Construction Group Southwest Co.,Ltd.,Chengdu 610052,China)

机构地区：[1]贵州中建建筑科研设计院有限公司,贵州贵阳550006 [2]四川大学高分子研究所,高分子材料工程国家重点实验室,四川成都610065 [3]中建西部建设股份有限公司,四川成都610017 [4]中建西部建设西南有限公司,四川成都610052

出　　处：《合成化学》2019年第7期513-517,共5页Chinese Journal of Synthetic Chemistry

基　　金：国家重点研发计划项目(2017YFC0806100,CSCEC4B-2018-KT-44,CSCEC4B-2018-KT-43);贵州省科技计划课题(黔科合院士站[2015]4006)

摘　　要：以聚烷氧烯基长链不饱和单体和丙烯酸为单体,S,S′-二(α,α′-甲基-α″-乙酸)三硫代碳酸酯(TRIT)为链转移剂,偶氮二异丁腈(AIBN)为引发剂,通过可逆加成-断裂链转移聚合(RAFT)合成了系列不同单体比例的嵌段型聚羧酸减水剂,采用FT-IR、SEM和TG对减水剂的结构和性能进行表征。砂浆流动度测试结果表明:单体比例为1/6时,样品减水性能最优,钙矾石结晶生长良好且呈现针状,水泥水化速度相对较快。A serials of block polycarboxylic were synthesized by reversible addition-fragmentation chain transfer polymerization(RAFT), using polyalkoxy alkylene group macromonomers and acrylic acid as monomers, S,S ′-bis(α,α′-dimethyl-α″-acctic acid) trithiocarbionate(TRIT) as chain transfer agent, azodiisobutyronitrile as initiator. The structure and properties were characterized by FT-IR, SEM and TG. The results of mortar fluidity test showed that the sample prepared by 1/6 monomer ratio had the best water reducing performance. The needle shaped ettringite grew well, and the cement hydration rate was relatively fast.

关 键 词：聚烷氧烯基长链不饱和单体 丙烯酸 聚羧酸减水剂 嵌段型 RAFT聚合 水化性能 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]