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        聚羧酸原位改性氧化石墨烯減水劑的制備及對混凝土性能的影響
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        1.中國建筑材料科學研究總院有限公司;2.陜西科技大學 輕工科學與工程學院;3.山東浩宇建材科技有限公司

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        TQ528

        基金項目:

        國家重點研發計劃項目(2019YFC1520603)


        Preparation of polycarboxylic modified graphene oxide superplasticizer by in situ polymerization and its effects on concrete properties
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        1.China Building Materials Academy;2.College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science and Technology,Xi'3.'4.an;5.Shandong Haoyu Building Materials Technology Company Limited

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          摘要:

          通過異戊烯醇聚氧乙烯醚(IPEG)對氧化石墨烯(GO)進行原位酯化改性,合成了氧化石墨烯-異戊烯醇聚氧乙烯醚中間體(GO-IPEG),與丙烯酸通過自由基共聚合反應制備了聚羧酸原位改性氧化石墨烯減水劑GO-PCE。利用FTIR、Raman、UV-Vis及Zeta電位分別對GO-IPEG和GO-PCE結構進行了表征。紅外結果表明,IPEG接枝到GO表面,而后GO-IPEG與丙烯酸發生原位接枝聚合反應。UV-Vis及Zeta電位結果表明,GO-PCE依靠IPEG的空間位阻作用使GO在基體中具有較優的分散效果。水泥及混凝土性能結果顯示,當GO-PCE折固摻量為0.15%(以水泥質量為基準)時,即可達到飽和吸附,水泥凈漿流動度高達280 mm,混凝土28 d抗壓強度為57 MPa、28 d收縮率為190×10-6、28 d電通量為1950 C。

          Abstract:

          Isopentenol polyoxyethylene ether modified graphene oxide (GO-IPEG) was prepared by in situ esterification reaction, and then polycarboxylic modified graphene oxide superplasticizer (GO-PCE) was prepared by GO-IPEG and acrylic acid (AA) using the method of in situ free radical copolymerization. The molecular structure and the dispersion stability of GO-IPEG and GO-PCE were characterized by FTIR, Raman spectra, UV-vis and zeta potential. FTIR results indicate that IPEG was successfully grafted onto the surface of GO by the esterification of carboxyl groups and hydroxyl groups, and then GO-IPEG fabricated with acrylic acid by in situ free radical polymerization. The results of UV-vis and zeta potential show that the the better dispersion properties of GO in polycarboxylic matrix depending on the steric resistance effect of IPEG. The results of cement and concrete show that saturated adsorption can be achieved when the solid content of GO-PCE is 0.15% (by mass of cement), and the fluidity of cement paste can reach 280 mm, the 28 d compressive strength of concrete is 57 MPa, and the 28 d shrinkage rate is 190 × 10-6, and the 28 d electric flux is 1950 C.

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        高瑞軍,李娟,呂生華,張豹,王宏霞,高春勇.聚羧酸原位改性氧化石墨烯減水劑的制備及對混凝土性能的影響[J].精細化工,2023,40(8):

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        歷史
        • 收稿日期:2022-10-14
        • 最后修改日期:2023-02-26
        • 錄用日期:2023-03-02
        • 在線發布日期: 2023-06-12
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