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Prashant Jindal, Girija S. Dubey, Rajiv Bhandari, Neha Dhiman, Chetna Bajaj and Vijay Kumar Jindal; Thermal Conductivity behaviour of MWCNT based PMMA and PC composites; Advanced NanoMaterials and Technologies for Energy Sector; 2018:2(1): 216-220
Poly methyl methacrylate (PMMA) and Polycarbonate (PC) are low cost polymer materials which can be easily transformed into desired shapes for various applications. However, they have poor mechanical, thermal and electrical properties which are required to be enhanced to widen their scope of applications specifically where along with high strength, rapid heat transfer is essential. Multi Walled Carbon nanotubes (MWCNTs) are excellent new materials having extraordinary mechanical and transport properties. In this paper, we report results of fabricating composites of varying compositions of MWCNTs with PMMA and PC and their thermal conductivity behaviour using simple transient heat flow methods. The samples in disk shapes of around 2 cm diameters and 0.2 cm thickness with MWCNT compositions varying up to 10wt% were fabricated. One end of the disk was exposed to a constant steam temperature while the temperature of the other end was measured for each sample after a time period of 10seconds. The rise in temperature for the specimens was correlated with thermal conductivity which was appropriately calibrated. We found that both PMMA and PC measured high thermal conductivity with increase in the composition of CNTs. The thermal conductivity of 10wt% MWCNT/PMMA composite increased by nearly two times in comparison to pure PMMA while thermal conductivity of 10wt% MWCNT/PC composite specimen increased by nearly four times in comparison to pure PC. This indicates that presence of MWCNTs in minor compositions can significantly affect thermal conductive properties of both PC and PMMA, thereby enabling them for rapid heat dissipating units.