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聚羧酸 - 硅烷改性氧化石墨烯复合材料对水泥净浆性能的影响

Effect of Polycarboxylate-Silane Modified Graphene Oxide Composite on the Properties of Cement Pastes.

作者信息

Liu Shuang, Li Shiyu, Wang Qin, Zhang Ruifeng, Liu Xiao

机构信息

Beijing Building Materials Academy of Sciences Research, Beijing 100041, China.

State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing 100041, China.

出版信息

Materials (Basel). 2022 Aug 2;15(15):5313. doi: 10.3390/ma15155313.

DOI:10.3390/ma15155313
PMID:35955249
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369957/
Abstract

As a nano-carbon material with excellent properties, Graphene oxide (GO) has been widely used in cement-based materials, and the negative effect of paste workability caused by GO agglomeration has also been widely concerning. In this study, a polycarboxylate-silane modified graphene oxide composite (PSG) was prepared by coupling polycarboxylate molecules to the surface of graphene oxide (GO) via a reaction with vinyl triethoxysilane. The effects of GO and PSG on the cement paste and the mechanisms underpinning these effects were investigated using fluidity and rheological parameter measurements, and ion concentration and zeta potential analyses. It was found that, in the aqueous phase of the paste, the polycarboxylate molecular chains on the surface of the PSG complexed with calcium ions (Ca), thereby preventing Ca from bridging the GO sheets, and thus stabilizing the surface potential and the electrostatic repulsion. This prevented the PSG from forming an agglomerate structure such as that formed by GO under the same conditions, thereby substantially enhancing workability of paste with nano-carbon material. This study provides some new foundations and ideas for the further application of graphene oxide materials in cement-based materials.

摘要

作为一种具有优异性能的纳米碳材料，氧化石墨烯（GO）已被广泛应用于水泥基材料中，同时，由GO团聚引起的浆体工作性负面影响也受到广泛关注。在本研究中，通过将聚羧酸分子与乙烯基三乙氧基硅烷反应，使其偶联到氧化石墨烯（GO）表面，制备了一种聚羧酸 - 硅烷改性氧化石墨烯复合材料（PSG）。通过流动性和流变参数测量以及离子浓度和zeta电位分析，研究了GO和PSG对水泥浆体的影响及其作用机制。结果发现，在浆体的水相中，PSG表面的聚羧酸分子链与钙离子（Ca）络合，从而阻止Ca桥接GO片层，进而稳定表面电位和静电排斥力。这防止了PSG形成与相同条件下GO所形成的团聚结构，从而显著提高了含纳米碳材料浆体的工作性。本研究为氧化石墨烯材料在水泥基材料中的进一步应用提供了一些新的基础和思路。

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