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Studies on Thermal and Dynamic Viscoelastic Behaviors of Multiwalled Carbon Nanotubes-reinforced Epoxy Matrix Composites  

Seo, Min-Kang (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Park, Soo-Jin (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Publication Information
Korean Chemical Engineering Research / v.43, no.3, 2005 , pp. 401-406 More about this Journal
Abstract
In this work, the effect of chemical treatment of multiwalled carbon nanotubes (MWNTs) on glass transition temperature (Tg), thermal stability, and dynamic viscoelastic behaviors of MWNTs-reinforced epoxy matrix composites has been studied by differencial scanning calorimeter (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) measurements. The MWNTs were chemically treated with 35 wt％ $H_3PO_4$ (A-MWNTs) or 35 wt％ KOH (B-MWNTs) solutions and the changes of surface properties of chemically treated MWNTs were examined by pH, acid and base values, Fourier transfer-infrared spectroscopy (FT-IR), and x-ray photoelectron spectroscopy (XPS) analyses. The chemical treatments based on acid and base reactions led to a significant change of surface characteristics and chemical compositions of the MWNTs, especially A-MWNTs/epoxy composites had higher thermal stability and dynamic viscoelastic properties than those of B-MWNTs and non-treated MWNTs/epoxy composites. These results were probably due to the improvement of interfacial bonding strength, resulting from the acid-base interaction and hydrogen bonding between the epoxy resins and the MWNT fillers.
Keywords
Multiwalled Carbon Nanotubes (MWNTs); Chemical Treatment; Thermal Stability; Dynamic Viscoelastic Behaviors;
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