Synthesis, Characterization and Performance of Superplasticizer with a Multi-Arm Structure

Abstract:

A novel superplasticizer with a multi-arm structure, i.e., a “core” connected with multiple copolymer “arms”, was synthesized through two steps including an esterification reaction between polyhydric alcohols and acrylic acid and a copolymerization reaction in an aqueous solution among the esterification product, isobutenyl polyethylene glycol and acrylic acid. The reaction conditions were determined, and the results showed that the esterification rate can reach above 95% with a water-carrying agent of 70g, a catalyst/alcohol molar ratio of 0.07, an inhibitor/monomer molar ratio of 0.03, and a reaction time of 7 hrs. The reaction products were characterized by ¹H Nuclear Magnetic Resonance (¹H NMR) and Fourier Transform infrared spectroscopy (FTIR). It is confirmed to be the multi-arm structure, and the self-synthesized superplasticizer with a multi-arm structure exhibited higher energy efficiency, which was in accordance with its excellent paste fluidity performances and adsorption behavior in cement paste

• Periodical: Materials Science Forum (Volume 815)
• Pages: 594-600
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.815.594
• Online since: March 2015
• Authors: Xiao Liu, Zi Ming Wang, Jie Zhu, Ming Zhao, Yun Sheng Zheng
• Keywords: Fluidity, Molecular Design, Multi-Arm Structure, Polymerization, Superplasticizer

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