Effect of Crosslink Structure of Bridge Polyearboxylate Superplasticizers on Dispersion Ability

• Published in: 武汉理工大学学报：材料科学英文版 no. 2; pp. 339 - 342
• Main Author: BI Yao LEI Jiaheng DU Xiaodi ZHANG Anfu
• Format: Journal Article
• Language: English
• Published: 2013
• Subjects: 交联共聚物; 交联结构; 凝胶渗透色谱; 分布曲线; 分散能力; 聚乙二醇二丙烯酸酯; 高效减水剂; 高斯分布
• ISSN: 1000-2413

Bridge polycarboxylate superplasticizers（PCs） with crosslink structure were synthesized by using polyethyleneglycol di-acrylate（PEGdA）, replacing partial polyethyleneglycol mono-acrylate （PEGmA） as crosslinking agent. Structures of bridge PCs were analyzed by gel permeation chromatography, and dispersion ability was evaluated by cement paste dispersity variation on time and rheology test. The experimental results showed that, molecular weight（MW） of bridge PCs increased with increase of PEGdA proportion, and MW distribution curve changed from Gaussian to fiat like, which meant notable increase of highly crosslinked copolymer. Bridge PCs led to decreased initial cement paste dispersity and better dispersity retention due to slow releasing. Further research showed that, PEGdA proportion had slight effect on polymerization degree of backbone, MW distribution of backbone deviated from Gaussian distribution and shoulder peaks appeared on distribution curve when PEGdA increased.