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季戊四醇四丙烯酸酯交联剂对水泥基体系中聚羧酸减水剂性能的影响

Influence of Pentaerythritol Tetraacrylate Crosslinker on Polycarboxylate Superplasticizer Performance in Cementitious System.

作者信息

Gao Yu, Zhao Hongwei, Chen Guang, Peng Qi, Liu Yingying, Song Fei, Liu Qingquan

机构信息

School of Material Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.

Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan 411201, China.

出版信息

Materials (Basel). 2022 Feb 18;15(4):1524. doi: 10.3390/ma15041524.

DOI:10.3390/ma15041524
PMID:35208064
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8875641/
Abstract

In this work, a crosslinked polycarboxylate superplasticizer (crosslinked-PC) was synthesized via the free radical polymerization reaction. Pentaerythritol tetraacrylate (PETA) was used as the crosslinked agent. A comparative comb-like polycarboxylate superplasticizer (comb-like-PC) was prepared under the same reaction conditions. The dispersion retention capacity, dispersion capability, hydration characteristics of the cement paste and setting time were investigated in detail. At the dosage of 0.6% bwoc, the fluidity of the cement/crosslinked-PC paste was about 340 mm, which was 40~50 mm larger than the cement/comb-like-PC paste. The dispersion retention capacity of the cement/crosslinked-PC paste was observed to be much superior due to higher adsorbed amounts on the cement particles. Moreover, the cement/crosslinked-PC paste exhibited the initial and final setting durations of 196 and 356 min, respectively, which indicated an enhancement of 18 and 68 min compared to the cement/comb-like paste. The crosslinked copolymers exhibit a stronger retardation effect than the comb-like copolymers due to their enhanced adsorbed amounts and stronger steric hindrance effect. This is further illustrated by the characterization of the hydration process and hydration products. It can be concluded that it is feasible to improve the dispersive capacity and the dispersion retention capacity of PC by changing the molecule structure from comb-like to slightly crosslinked.

摘要

在本研究中，通过自由基聚合反应合成了一种交联聚羧酸系高效减水剂（交联聚羧酸）。季戊四醇四丙烯酸酯（PETA）用作交联剂。在相同反应条件下制备了一种对比性梳状聚羧酸系高效减水剂（梳状聚羧酸）。详细研究了水泥净浆的分散保持能力、分散能力、水化特性和凝结时间。在掺量为水泥质量的0.6%时，水泥/交联聚羧酸净浆的流动度约为340mm，比水泥/梳状聚羧酸净浆大40~50mm。由于在水泥颗粒上的吸附量更高，水泥/交联聚羧酸净浆的分散保持能力明显更优。此外，水泥/交联聚羧酸净浆的初凝和终凝时间分别为196min和356min，相较于水泥/梳状聚羧酸净浆，分别延长了18min和68min。交联共聚物由于其增加的吸附量和更强的空间位阻效应，表现出比梳状共聚物更强的缓凝作用。水化过程和水化产物的表征进一步说明了这一点。可以得出结论，通过将分子结构从梳状转变为轻度交联来提高聚羧酸的分散能力和分散保持能力是可行的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25ab/8875641/ab4f4f5a2d88/materials-15-01524-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25ab/8875641/9804de2313d9/materials-15-01524-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25ab/8875641/d720e906ccc0/materials-15-01524-g008.jpg
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