摘要
将异戊烯醇聚氧乙烯醚(IPEG)对氧化石墨烯(GO)进行原位酯化改性,合成了中间体GO-IPEG,与丙烯酸通过自由基共聚合反应制备了聚羧酸原位改性氧化石墨烯减水剂GO-PCE,并将其用于混凝土中。利用FTIR、Raman、UV-Vis及Zeta电位分别对GO-IPEG和GO-PCE结构和性能进行了表征与测试,评价了其对混凝土性能的影响。结果表明,IPEG接枝到GO表面,然后GO-IPEG与丙烯酸发生原位接枝聚合反应。GO-PCE依靠IPEG的空间位阻作用使其在基体中具有较优的分散效果。当GO-PCE折固掺量为0.15%(以水泥质量为基准,下同)时,GO-PCE在水泥颗粒表面的吸附即可达到饱和,水泥净浆流动度高达280 mm。当GO-PCE折固掺量为0.2%时,混凝土28 d抗压强度为57 MPa、28 d收缩率为1.90×10^(-4)、28 d电通量为1950 C。
Polycarboxylic modified graphene oxide superplasticizer(GO-PCE)was prepared from in situ free radical copolymerization of acrylic acid and intermediate isopentenol polyoxyethylene ether(IPEG)modified graphene oxide(GO)(GO-IPEG)synthesized from in situ esterification reaction of IPEG and GO,and then applied in concrete.The structure and properties of GO-IPEG and GO-PCE were characterized and analyzed by FTIR,Raman spectra,UV-Vis and Zeta potential.The influence of GO-PCE on the performance of concrete was further evaluated.The results indicated that IPEG was successfully grafted onto the surface of GO and then reacted with acrylic acid by in situ free radical polymerization.GO-PCE displayed better dispersion in matrix due to the steric resistance effect of IPEG.Cement with a GO-PCE content of 0.15%(based on the mass of cement,the same below),achieved saturated adsorption of GO-PCE on the surface of cement particle,while the fluidity reached 280 mm;Cement with a GO-PCE content of 0.20%,the 28 d compressive strength 57 MPa,the 28 d shrinkage rate 1.90×10^(-4),and the 28 d electric flux 1950 C,respectively.
作者
高瑞军
李娟
吕生华
张豹
王宏霞
高春勇
GAO Ruijun;LI Juan;LYU Shenghua;ZHANG Bao;WANG Hongxia;GAO Chunyong(China Building Materials Academy Co.,Ltd.,Beijing 100024,China;College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;Shandong Haoyu Building Materials Technology Co.,Ltd.,Zouping 256200,Shandong,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2023年第8期1841-1848,共8页
Fine Chemicals
基金
国家重点研发计划项目(2019YFC1520603)。
关键词
氧化石墨烯
聚羧酸
原位聚合
混凝土性能
增强抗裂
建筑用化学品
graphene oxide
polycarboxylic
in situ polymerization
concrete properties
strength enhance and crack resistance
building chemicals
作者简介
高瑞军(1985—),男,博士,高级工程师,E-mail:gao_423@163.com。
