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为了解决氧化石墨烯(GO)纳米片层在水泥基体中的分散问题,制备了丙烯酸(AA)、丙烯酰氧乙基三甲基氯化铵(AAC)和丙烯磺酸钠(SAS)的共聚物(PAAS),PAAS与GO纳米片层形成PAAS/GO复合物并显示出分散作用。结果表明,w(PAAS)=2%分别与w(GO)=0.01%、0.02%和0.03%形成的复合物可使水泥基体分别形成由花状晶体、多面体状晶体和针状晶体构成的规整有序的微观结构,28 d时的抗折强度分别比对照样提高了63.0%、90.4%和87.9%,抗压强度分别提高了32.6%、74.2%和71.3%,同时这些水化晶体容易生长在裂缝、孔洞等缺陷处,具有修复结构缺陷的效果。PAAS通过与GO纳米片层形成复合物实现了GO在水泥基材料中的均匀分散以及对水泥基材料微观结构和性能的调控。
In order to solve the dispersion problem of graphene oxide (GO) nanosheets in cement matrix, copolymerization of acrylic acid (AA), acryloyloxyethyltrimethylammonium chloride (AAC) and sodium propane sulfonate (SAS) PAAS, PAAS and GO nanosheets formed PAAS / GO complexes and showed dispersion. The results show that the composite formed by w (PAAS) = 2% and w (GO) = 0.01%, 0.02% and 0.03% respectively can make the cement matrix form a regular pattern composed of flower-like crystals, polyhedral crystals and acicular crystals The ordered microstructure showed that the flexural strength increased by 63.0%, 90.4% and 87.9% respectively at 28 d, and the compressive strength increased by 32.6%, 74.2% and 71.3% respectively, and the hydration crystals grew easily at the same time In cracks, holes and other defects, with the effect of repairing structural defects. PAAS forms a composite with GO nanosheet layer to achieve uniform dispersion of GO in cement-based materials and to control the microstructure and properties of cement-based materials.