Effects of the Carboxyl Density on the Properties of Polycarboxylate-Type Superplasticizer
Effects of the Carboxyl Density on the Properties of Polycarboxylate-Type Superplasticizer
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DOI：
10.4028/www.scientific.net/amr.989-994.151
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
C. Fu;G. Zheng;Kang Li;Yao Bi;L. Xiong
中科院分区：
文献类型：
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作者：
C. Fu;G. Zheng;Kang Li;Yao Bi;L. Xiong
分别通过坍落度试验、凝胶渗透色谱(GPC)和高效液相色谱(HPLC)研究了羧基密度(丙烯酸与聚氧乙烯醚的比例)对聚羧酸酯(PCE)性能、分子量和单体转化率的影响。结果表明，随着羧基密度从2:1增加到7:1，PCE的分子量从7968.5增加到13930.1，分子量分布系数从1.5增加到2。HPLC数据表明羧基密度不影响单体转化率。水泥浆体流动性测试表明，当羧基密度为4.0:1时，PCE表现出最佳的分散和分散保持能力。
The effect of carboxyl density (the ratio of acrylic acid and polyoxyethylene ether) upon the performance, molecular weight, and monomer conversion rate of polycarboxylate (PCE) were investigated by slump test, Gel Permeation Chromatography (GPC) and High Performance Liquid Chromatography (HPLC), respectively. The results showed that with carboxyl density increased from 2:1 to 7:1, molecular weight of PCE increased from 7968.5 to 13930.1 and the molecular weight distribution coefficient increased from 1.5 to 2. The HPLC date indicated carboxyl density does not affect the rate of monomer conversion. Test of the fluidity of cement pastes displayed that as carboxyl density was 4.0:1, PCE show the optimal dispersion and dispersion-retaining ability.