摘要
采用不同分子量(500、1 200、2 400 g/mol)的异戊烯基聚氧乙烯醚(IPEG)大单体与丙烯酸在水溶液中经自由基聚合,得到不同分子结构的聚羧酸超塑化剂样品。测定了聚羧酸样品的分子量及分子量分布和聚羧酸超塑化剂分子的单体序列结构(AAA、AAE、EAE,其中A为丙烯酸,E为IPEG大单体),计算得到了不同样品中3种单体序列结构的比例组成,并测定了不同单体序列结构的聚羧酸分子在水泥颗粒上的吸附量和分散性能。结果表明,分子量为2 400 g/mol的IPEG制备的聚羧酸超塑化剂样品含有更多的AAA序列结构,分子量分布窄、在水泥颗粒上的吸附速率慢、吸附量低,对水泥颗粒有较佳的分散和分散保持能力。
A series of carboxylate superplasticizers(PCEs)with various chemical structures were synthesized via free radical copolymerization from acrylic acid(AA)and isoprenyloxy polyethylene glycol(IPEG,E)with different molecule mass(i.e.,500,1 200,and 2 400 g/mol).The molecular weight characters and monomer sequences(AAA,AAE,EAE)of PCE polymers were detected,and the content ratios of monomer sequences were calculated.The adsorption amount and dispersive ability of PCE with different monomers sequences were also measured.The results indicate that PCE prepared by IPEG with the molecular weight of 2 400 g/mol containing a higher AAA monomer sequence presents a lower molecular mass distribution,a lower adsorption rate/amount,and excellent water reducing/retention ability to cement particles.
作者
李慧群
姚燕
王子明
LI Huiqun;YAO Yan;WAGN Ziming(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;China Building Materials Academy,Beijing 100024,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2019年第2期201-206,共6页
Journal of The Chinese Ceramic Society
基金
国家重点研发项目(2017YFB0310002)
关键词
聚羧酸超塑化剂
异戊烯基聚氧乙烯大单体
单体序列结构
分子量
吸附量
carboxylate superplasticizer
isoprenyloxy polyethylene glycol macromonomer
monomer sequence
molecular mass
adsorption amount
