Oxidative Treatment of Multi-Walled Carbon Nanotubes and its Effect on the Mechanical and Electrical Properties of Green Epoxy based Nano-Composites

摘要

Oxidative treatment of Multi-Walled Carbon Nanotubes (MWCNT's) was done by chemical functionalization by using the mixture acid, which is a mixture of sulfuric acid (H_2SO_4) and nitric acid (HNO_3). Functionalization was governed by four parameters namely mixture acid concentration, temperature(T), time of heating(t) and the amount of MWCNTs used. After functionalization, functionalized MWCNT's were then diluted in dimethylformamide (DMF) to analyse the percentage of soluble MWCNT's. Also, by increasing the time of functionalization, it was observed that overall yield decreases but the percentage of functionalized product inside the yield quantity remains the same. Material characterization was also carried out at several steps to validate this theory. Chemical functionalization of MWCNT's is generally significant for the manufacturing of polymer-based nanocomposites. Oxidative treatment enhances the dispersion and interfacial bonding within the epoxy matrix. In this research work, a bio-based epoxy resin was selected for the manufacturing of nanocomposite samples with various concentrations of pristine and functionalized MWCNTs. Mechanical and electrical characterization was finally carried out to increase the knowledge on the interaction of MWCNT's with the selected green epoxy matrix system and their influence on the original properties of the resin.