Synthesis of polymer decorated nano- $ SiO_{2} $ and its effects on cement-based materials

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Apr.2026, Vol.49 No.4: 511-515, 522

DOI: 10.3969/j.issn.1003-5060.2026.04.011

Authors

WO Jiangang $ ^{1} $, WANG Wenping $ ^{1} $, ZHOU Zhengfa $ ^{1} $, WANG Di $ ^{2} $

(1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; 2. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China)

Abstract and Keywords

Abstract: On the base of nano- $ SiO_{2} $ modified by KH550, the surface of nano- $ SiO_{2} $ was treated with methyl acrylate(MA) and ethylenediamine(EDA) for chain extension, and then methoxy polyethylene glycol diacrylate(MPEG-DA) was anchored onto the nano- $ SiO_{2} $ surface. The specific structure of MPEG-DA modified nano- $ SiO_{2} $ was characterized by Fourier transform infrared spectrometer (FTIR) and thermogravimetric analyzer (TGA). The hydration process, electron microscopic patterns and pore size distribution of cement pastes doped with nano- $ SiO_{2} $ and MPEG-DA modified nano- $ SiO_{2} $ were analyzed. The results show that MPEG-DA modified nano- $ SiO_{2} $ can control cement paste hydration process, refine the microstructure and decrease the porosity of cementitious material. Besides, the nano- $ SiO_{2} $ modified by MPEG-DA not only can optimize the workability of cement-based materials, but also can enhance their mechanical strength. When the content of MPEG-DA modified nano- $ SiO_{2} $ was 0.5% of cementitious material, the compressive strength of fabricated cement mortar and concrete increased by 43.1% and 27.8%, respectively, compared to the reference sample after curing for 28 days.

Keywords: cement-based materials; nano- $ SiO_{2} $; hydration; fluidity; compressive strength

作者信息

沃建港 $ ^{1} $，王文平 $ ^{1} $，周正发 $ ^{1} $，王帝 $ ^{2} $

(1. 合肥工业大学化学与化工学院, 安徽合肥 230009; 2. 安徽建筑大学材料与化学工程学院, 安徽合肥 230601)

摘要和关键词

摘要: 文章采用偶联剂 KH550 改性后的纳米 $ SiO_{2} $ 与丙烯酸甲酯（MA）、乙二胺（EDA）进行反应，再将甲氧基聚乙二醇-丙烯酸酯（MPEG-DA）接枝在经过 MA 和 EDA 扩链处理后的纳米 $ SiO_{2} $ 表面。采用傅里叶变换红外光谱仪（Fourier transform infrared spectrometer，FTIR）和热失重分析仪（thermogravimetric analyzer，TGA）对 MPEG-DA 改性的纳米 $ SiO_{2} $ 的结构进行表征，并分析掺杂纳米 $ SiO_{2} $ 和 MPEG-DA 改性纳米 $ SiO_{2} $ 水泥浆体的水化过程、微观结构以及孔径分布。结果表明：MPEG-DA 改性纳米 $ SiO_{2} $ 可以调控水泥浆体水化过程、精炼水泥试件的微观结构，抑制水泥试件的孔隙率的增加；MPEG-DA 改性纳米 $ SiO_{2} $ 不仅能优化水泥基材料的施工性能，还可以显著强化水泥基材料的力学强度；在 MPEG-DA 改性纳米 $ SiO_{2} $ 的掺量为胶凝材料质量的 0.5% 时，砂浆和混凝土 28 d 的抗压强度较空白样增长了 43.1% 和 27.8%。

关键词: 水泥基材料；纳米二氧化硅；水化；流动度；抗压强度

Funding

国家自然科学基金青年科学基金资助项目（52003004）

合肥工业大学学报(自然科学版)

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