Preparation and characterization of nano-alumina filled HDPE conducting polymer composite

Chon, Yu Yun (2016) Preparation and characterization of nano-alumina filled HDPE conducting polymer composite. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Polymers are generally known as electrical insulators, but to enable their use in electronic applications, development of conducting polymer seems an interesting approach in recent years. For this purpose, one specific strategy is based on blending conventional polymeric insulator, HDPE with organic conductive fillers, polyaniline (PAni) and multiwalled carbon nanotube (MWCNT) to form conducting polymer composites, CPCs. The most basic mechanical mixing without modification on the original conductive fillers is used. This indigenous design guarantees an outstanding of electrical conductivity performance with low cost processing due to the advantage of polymer itself. However, the drawbacks of those conductive fillers including agglomeration of nanoparticles and sensitive to the humidity surrounding will inhibit the conductivity. Hence, nano-sized inorganic filler, alumina is called upon to incorporate into the CPCs to overcome these issues. Electrical conductivity is obtained by using the volume resistivity testing. Moreover, Fourier transform infrared (FTIR) and differential scanning calorimetry (DSC) techniques were used to characterize and analyse the electrical characteristics of the CPCs. In this case, PAni CPC shows higher conductivity than MWCNT CPC, 6.69 Scm-1 over 1.15 Scm-1. However, conductivity of both CPCs is reduced after 6 weeks preparation. After incorporating with nano-alumina, the conductivity is then stabilised. CPCs are currently used for electromagnetic shielding, as corrosion inhibitors, in electroluminescent and cellular phone displays, for static dissipation, and for various sensing devices. Last but not least, immense efforts in the polymeric electronics field have led to unprecedented progress and to devices of ever increasing performance.

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