阳离子聚合物改性氧化石墨烯对水泥基复合材料性能的影响

doi:10.19964/j.issn.1006-4990.2024-0383

摘要/Abstract

摘要：

氧化石墨烯（GO）在混凝土中的团聚问题会影响GO作增强填料的水泥基复合材料的力学性能。为解决GO在水泥基复合材料中的分散问题，用亲水性聚4-乙烯基吡啶（P4VP）对GO进行表面接枝处理，然后再对其进行季铵化改性，制备了阳离子化P4VP（CP4VP）接枝改性的GO（CP4VP-GO），并制备了分别掺加未改性GO和阳离子化改性CP4VP-GO的水泥基复合材料。分别采用傅里叶红外光谱（FT-IR）、X射线衍射（XRD）、扫描电子显微镜（SEM）等手段对样品结构进行表征。结果表明，阳离子聚合物改性CP4VP-GO在氢氧化钙溶液中的分散性要优于未改性GO。此外，复合材料的抗压强度和抗折强度受水化时间和填料含量的影响，当CP4VP-GO在水泥中的掺量为0.04%（质量分数）时，水泥基复合材料在28 d时的抗折强度高达8.2 MPa，明显高于未改性GO；当CP4VP-GO的掺加量为0.06%时，水泥基复合材料28 d时的最大抗压强度达到了73.2 MPa。该工作为设计制备高性能水泥基复合材料提供了理论和实验依据。

关键词: 氧化石墨烯, 阳离子化, 抗压强度和抗折强度, 混凝土, 复合材料

Abstract:

The aggregation issue of graphene oxide（GO） in concrete can affect the mechanical properties of cement-based composites reinforced with GO as filler.To address the dispersion problem of GO in cement-based composites，GO was surface-grafted with hydrophilic poly 4-vinylpyridine（P4VP） and then quaternized to prepare cationic P4VP-grafted GO（CP4VP-GO）.Cement-based composites incorporating both unmodified GO and cationic modified CP4VP-GO were prepared.Characterization of the sample structures was conducted using fourier transform infrared spectroscopy（FT-IR），X-ray diffraction（XRD），and scanning electron microscopy（SEM），among other techniques.The results indicated that the dispersibility of cationic polymer modified CP4VP-GO in calcium hydroxide solution was better than that of unmodified GO.In addition，the compressive strength and flexural strength of the composite were affected by the hydration time and the content of the filler.When the content of CP4VP-GO in cement was 0.04%（mass fraction），the flexural strength of the cement composite at 28 d was as high as 8.2 MPa，which was significantly higher than that unmodified GO.When the content of CP4VP-GO was 0.06%，the maximum compressive strength of the cement composite at 28 d reached 73.2 MPa.This work provided theory and experimental basis for designing and preparing high performance cement-based composites.

Key words: graphene oxide, cationization, compressive strength and flexural strength, concrete, composite materials

中图分类号:

TB332

刘贝贝, 李正涛. 阳离子聚合物改性氧化石墨烯对水泥基复合材料性能的影响[J]. 无机盐工业, 2025, 57(7): 80-86.

LIU Beibei, LI Zhengtao. Effect of cationic polymer modified graphene oxide on performance of cement-based composites[J]. Inorganic Chemicals Industry, 2025, 57(7): 80-86.

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