Improved Microwave Absorption of E- Glass Epoxy Composites by Conducting Polymer Coated Carbon Nano-tubes

Mondal, Payel and Ch, Subrahmanyam (2016) Improved Microwave Absorption of E- Glass Epoxy Composites by Conducting Polymer Coated Carbon Nano-tubes. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Enhanced microwave absor bing properties have been achieved using E-glass-epoxy composites by integrating them with conducting polymers (CPs), namely poly(pyrrole)(PPY), poly(aniline)(PANI), poly (ethylene dioxythiophene)(PEDOT) and Multiwalled carbon nanotubes coated by CPs. In order to obtain CP coating on MWCNTs, in-situ polymerization of pyrrole, EDOT and aniline was carried out by using dioctyl sodium sulfosuccinate (structure directing agent), ferric chloride (oxidant) and MWCNTs (template). The formation of CP coating on MWCNTs was confirmed by scanning electron microscopy (SEM) and thermo gravimetric analysis (TGA) studies. Different weight % of CP and CP coated MWCNTs were added to the epoxy resin as nano-reinforcement and the entire mixture was used as a matrix to prepare the 2D laminated E-glass-epoxy composites by hand layup method. Microwave absorbing properties of the prepared E-glass-epoxy composites were analyzed using Wave guide measurement. Initial results showed that CP coated MWCNTs, at 0.5wt% addition to epoxy imparted highest microwave absorbing properties in terms of permittivity and reflection loss for E-glass-epoxy composites. CP coated MWCNTs-E-glass-epoxy composites exhibits microwave absorption is mainly due to the dielectric loss of the microwave field in the composites.

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