氧化石墨烯在水泥基体中的分散性及对其结构和性能的影响

Dispersity of graphene oxide in cement matrix and its impact on the structure and properties

摘要:

为了解决氧化石墨烯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复合物显示分散作用。结果表明，2%的w(PAAS)分别与0.01%、0.02%和0.03%的w(GO)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时的抗折强度比对照样提高了63.0%、90.4%和87.9%，抗压强度提高了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。

Abstract:

Copolymer (PAAS) of acrylic acid (AA), acryloyloxyethyltrimethyl ammonium chloride (AAC) and sodium allylsulfonate (SAS) was prepared by polymerization in order to solve the problem of uniformly dispersity of graphene oxide (GO) nanosheets in cement matrix. PAAS with GO nanosheets forms the PAAS/GO composites achieve the dispersive effects. The tested results indicated that the PAAS/GO composites consisted of PASS with mass fraction of 2% and GO with mass farction of 0.01%, 0.02% and 0.03%, respectively, can regulate the cement matrix to from regulation and order microstructure gathered by flower-like, polyhedron-like and needle-like crystals, respectively. The flexural strength of corresponding to cement materials have an increase of 63.0%, 90.4% and 87.9% at 28 d, respectively, and the corresponding tensile strength have an increase of 32.6%, 74.2% and 71.3%, respectively. These cement hydration crystals usually easily growed in cracks and holes of cement matrix and had repairing function for the cracks and holes. PASS forming the composites with GO nanosheets achieve uniformly dispersion GO nanosheets in cement matrix and effective control the microstructure and properties.