Effect of Crosslink Structure of Bridge Polycarboxylate Superplasticizers on Dispersion Ability  

作　　者：毕耀 雷家珩 DU Xiaodi ZHANG Anfu 

机构地区：[1]School of Materials Science and Engineering, Wuhan University of Technology [2]School of Science, Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2013年第2期339-342,共4页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Western Region Traffic Construction Technology Program of the Ministry of Transport of China(No.2007319811130)

摘　　要：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.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.

关 键 词：bridge polycarboxylate superplasticizers cement paste dispersity crosslink structure polyethyleneglycol di-acrylate 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]