| Citation: |
WANG Shu, WU Zhuliang, ZHENG Jianmin, ZHANG Yang, DENG Yiqiang. Synthesis and Application of Ethenyloxy-polyoxyethylene Ether Slump Retaining Typed Polycarboxylate Superplasticizer[J]. Journal of South China Normal University (Natural Science Edition), 2024, 56(3): 34-39. DOI: 10.6054/j.jscnun.2024035
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Based on molecular structure design theory, a polycarboxylic acid superplasticizer with high slump retaining performance was prepared by free radical polymerization with acrylic acid and acrylamide in the Redox system of sodium erythorbate/Na2SO3 and Fe2+, using ethenyloxy polyoxyethylene ether with double bond directly connected with oxygen atom as polymeric monomer. The results showed that the ethenyloxy-polyoxyethylene ether has higher polymerization activity than conventional polyether monomer due to its C＝C double bond directly connected with oxygen atom, and the time of induction period can be shortened by nearly 1/2. The initial and 1 h slump of the prepared concrete can be increased by 16% and 64%, respectively, compared with conventional water reducing agents. However, the initial and 1 h slump expansion were 7% and 22% higher. The FT-IR spectra showed that the amide group and carboxyl group of the functional monomers were successfully grafted on the main chain of polycarboxylic acid superplasticizer.
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