河南城建学院学报2026，Vol.35Issue(2)：64-72,9.DOI:10.14140/j.cnki.hncjxb.2026.02.009
丙烯酰胺原位聚合与纳米二氧化硅协同改性水泥基封孔材料
In-situ polymerization of acrylamide and nano-silica synergistically modified cement-based sealing materials
摘要
Abstract
To enhance the compactness and toughness of cement-based borehole sealing materials used in gas extraction,a synergistic modification of cement mortar was achieved through the in-situ polymerization of nano-silica(NS)and acrylamide(AM).A comprehensive investigation into the enhancement mechanism was conducted via mechanical performance tests and microstructural analyses,including X-ray diffraction(XRD),thermogravimetry(TG)and scanning electron microscopy(SEM).The results indicate that NS pri-marily exerts nucleation and filling effects,effectively promoting early-age hydration and refining the pore structure,whereas AM forms a polymer network within the cement matrix,contributing to long-term tough-ness.With the combined addition of 1.5 wt%NS and 6 wt%AM,the 28-day compressive and flexural strengths increased to 37.26 MPa and 14.43 MPa,respectively,while the compressive-to-flexural strength ratio decreased from 4.1(control group)to 2.5.This combination resulted in an optimal balance between overall strength and toughness.Microstructural analysis revealed that the synergistic interaction between NS and AM accelerates the formation of early hydration products and improves pore morphology,endowing the sealing material with enhanced mechanical stability and deformation adaptability.The findings provide an ef-fective strategy for designing high-performance borehole sealing materials.关键词
丙烯酰胺/原位聚合/纳米二氧化硅/封孔材料/力学性能Key words
acrylamide/in-situ polymerizatio/nano-silica/sealing material/mechanical properties分类
化学化工引用本文复制引用
刘健,张冠..丙烯酰胺原位聚合与纳米二氧化硅协同改性水泥基封孔材料[J].河南城建学院学报,2026,35(2):64-72,9.基金项目
国家自然科学基金项目(52374178) （52374178）
