Abstract

Mechanochemical synthesis, a rapid and efficient method, was utilized in the synthesis of polycarboxylate superplasticizers (PCEs) for the first time. For comparison, traditional polycarboxylate superplasticizer (TPCE) was also synthesized by the aqueous solution copolymerization method. The molecular structure of PCEs synthesized by mechanochemistry (MPCEs) and TPCE were confirmed by gel permeation chromatography, Fourier transform infrared spectroscopy, and ¹H-nuclear magnetic resonance spectroscopy. The molecular weight of the synthesized MPCEs decreases with increasing reaction time in mechanochemical synthesis. Additionally, the concentrations of MPCEs and TPCE and the fluidity of the cement paste with MPCEs and TPCE were also investigated. MPCEs were found to have a much higher concentration than TPCE. When PCEs are added at 0.30 wt% of the cement dosage, the fluidities of the cement slurry with MPCE-A3 or MPCE-B3 are comparable to those of TPCE.

摘要

机械化学合成法是一种快速高效的方法，首次被用于聚羧酸减水剂（PCEs）的合成。为了比较，传统的聚羧酸减水剂（TPCE）也通过水溶液共聚法合成。通过凝胶渗透色谱法、傅里叶变换红外光谱法和¹H-核磁共振光谱。合成的 MPCE 的分子量随着机械化学合成中反应时间的增加而降低。此外，还研究了 MPCE 和 TPCE 的浓度以及含有 MPCE 和 TPCE 的水泥浆体的流动性。发现 MPCE 的浓度比 TPCE 高得多。当 PCEs 添加量为水泥用量的 0.30 wt% 时，MPCE-A3 或 MPCE-B3 水泥浆的流动性与 TPCE 相当。