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<p>In this study, N,N-diallyl-3-aminopropionic acid methyl ester (monomer N) was synthesized from diallylamine and methyl acrylate by the Michael addition reaction. The EPEG-type polycarboxylate superplasticizer PCE-N were prepared by free-radical polymerization of ethylene glycol monovinyl polyoxyethylene ether (EPEG) monomer with acrylic acid (AA), monomer N and AMPS in a H<sub>2</sub>O<sub>2</sub>-Vc redox initiator system. The synthesis parameters of PCE-N were investigated using single-factor experimental method, and the molecular structures were characterized by FT-IR, NMR and GPC techniques, and the mechanistic investigations of PCE-N were carried out by means of techniques such as the Zeta potential, optical microscopy, total organic carbon (TOC), X-ray photoelectron spectroscopy (XPS) and rheological properties. The optimal synthesis process parameters were obtained through the cement slurry fluidity tests: m(H<sub>2</sub>O<sub>2</sub>): m(EPEG) = 1.5%, m(Vc): m(EPEG) = 0.5%, m(MPA): m(EPEG) = 0.4%, n(AA): n(EPEG) = 3.5:1, n(monomer N): n(EPEG) = 0.5:1, n(AMPS): n(EPEG) = 0.4:1, reaction temperature: 30&#xa0;°C, reaction time: 3.5&#xa0;h, here m, n denote the mass ratio and molar ratio, respectively. The performance test results of PCE-N are as follows: 28.89% water reduction for mortar, the concrete compressive strengths are 26.6&#xa0;MPa (3-day), 30.7&#xa0;MPa (7-day) and 40.9&#xa0;MPa (28-day), respectively, which imply that the PCE-N has excellent dispersion, water reduction and compression resistance properties. The results of the mechanistic study showed that the excellent water reduction and dispersion properties of PCE-N were attributed to both the electrostatic repulsion effect and the steric hindrance effect.</p>

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Synthesis, characterization, performance evaluation and mechanistic investigations of a new class of hyperbranched polycarboxylate superplasticizer

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Bingyan Fan,
  • Li Hu,
  • Shuguang Zhang

摘要

In this study, N,N-diallyl-3-aminopropionic acid methyl ester (monomer N) was synthesized from diallylamine and methyl acrylate by the Michael addition reaction. The EPEG-type polycarboxylate superplasticizer PCE-N were prepared by free-radical polymerization of ethylene glycol monovinyl polyoxyethylene ether (EPEG) monomer with acrylic acid (AA), monomer N and AMPS in a H2O2-Vc redox initiator system. The synthesis parameters of PCE-N were investigated using single-factor experimental method, and the molecular structures were characterized by FT-IR, NMR and GPC techniques, and the mechanistic investigations of PCE-N were carried out by means of techniques such as the Zeta potential, optical microscopy, total organic carbon (TOC), X-ray photoelectron spectroscopy (XPS) and rheological properties. The optimal synthesis process parameters were obtained through the cement slurry fluidity tests: m(H2O2): m(EPEG) = 1.5%, m(Vc): m(EPEG) = 0.5%, m(MPA): m(EPEG) = 0.4%, n(AA): n(EPEG) = 3.5:1, n(monomer N): n(EPEG) = 0.5:1, n(AMPS): n(EPEG) = 0.4:1, reaction temperature: 30 °C, reaction time: 3.5 h, here m, n denote the mass ratio and molar ratio, respectively. The performance test results of PCE-N are as follows: 28.89% water reduction for mortar, the concrete compressive strengths are 26.6 MPa (3-day), 30.7 MPa (7-day) and 40.9 MPa (28-day), respectively, which imply that the PCE-N has excellent dispersion, water reduction and compression resistance properties. The results of the mechanistic study showed that the excellent water reduction and dispersion properties of PCE-N were attributed to both the electrostatic repulsion effect and the steric hindrance effect.