ABSTRACT

Multiwalled carbon nanotubes obtained via the Catalytic Chemical Vapor Deposition method were covalently functionalised by maleic anhydride – α-octene copolymer via ‘grafting from’ approach using a sonochemical method to obtain the additive for improving the mechanical properties of cement mortar. The catalyst and oxidising agent used for nanotube synthesis and surface activation through the formation of the functional groups in a mild condition were Fe – Co / Al₂O₃ and potassium permanganate, respectively. These functional moieties were used for the consequent functionalization of the nanotubes with the copolymer. The instrumental techniques like Transmission Electron Microscopy, Scanning electron microscopy, Fourier transform infrared spectroscopy, X - ray powder diffraction, and Raman spectroscopy were used to characterise the obtained nanostructures. The used techniques revealed the success of the surface functionalization in the formation of the strengthening additive. The results obtained from the compressive strength tests for the strengthening additive included cement mortar composites revealed the positive effects of the additive on the mechanical properties of the cement mortar over the reference material. The use of the ‘grafting from’ approach to covalently functionalise the multiwalled carbon nanotubes with maleic anhydride – α-octene copolymer via the sonochemical method to obtain strengthening additive for cement mortar is the novelty of the work.

摘要

将通过催化化学气相沉积法获得的多壁碳纳米管与马来酸酐-α-辛烯共聚物通过“接枝”方法进行共价官能化，使用声化学方法获得用于改善水泥砂浆力学性能的添加剂。用于纳米管合成和通过在温和条件下形成官能团进行表面活化的催化剂和氧化剂是 Fe – Co / Al ₂ O ₃和高锰酸钾，分别。这些功能部分用于随后用共聚物对纳米管进行功能化。使用透射电子显微镜、扫描电子显微镜、傅里叶变换红外光谱、X射线粉末衍射和拉曼光谱等仪器技术来表征所获得的纳米结构。所使用的技术揭示了表面功能化在增强添加剂形成中的成功。从增强添加剂（包括水泥砂浆复合材料）的抗压强度测试中获得的结果表明，添加剂对水泥砂浆的力学性能优于参考材料。