Title: Graphite Nanoplatelet-Filled Linear Low-Density Polyethylene: Nanocomposites for Enhanced Heat Transfer and Electrostatic Dissipation

Authors: Sagar Kanhere, Ozgun Guzdemir, Courtney Owens, Elijah Taylor, Jasmine McTyer, Prof. Amod A. Ogale

DOI: 10.33599/nasampe/s.22.0835

Abstract: Metals are being replaced with high-performance and lightweight polymers, but their low thermal conductivity and poor electrostatic dissipative properties are significant problems. For the protection of sensitive electronic circuitry in automotive and aerospace parts, housing materials must provide electrostatic discharge (ESD) and also dissipate heat generated at higher rates as electronic circuits are increasingly miniaturized. In a recent study, we reported that micro-texturing can increase convective heat transfer by almost 50% by incorporating boron nitride (BN) nanoparticles in linear low-density polyethylene (LLDPE) [1]. However, BN does not provide electrostatic properties. Therefore, in this study, electrically and thermally conductive graphite nanoplatelets were incorporated in LLDPE. Thermal conductivity of 30 vol% GNP-filled LLDPE was measured at 1.3 W/m.K (more than double that of pure LLDPE) with as much as 45% increase in heat dissipation area due to extended surface area generated by micro-texturing. Also, the addition of GNP increased surface and volume conductivity by almost eight orders of magnitude (resistivity down from ≈1014-15 to107-6 Ohm-cm) with electrostatic decay time reducing to less than 0.01 s at 30 vol% GNP content.

References: ] Ö. Güzdemir, S. Kanhere, V. Bermudez, A.A. Ogale, Boron Nitride-Filled Linear Low-Density Polyethylene for Enhanced Thermal Transport: Continuous Extrusion of Micro-Textured Films, Polymers. 13 (2021) 3393. https://doi.org/10.3390/polym13193393. [2] T.-C. Chang, Y.-K. Fuh, S.-X. Tu, Y.-M. Lee, Application of graphite nanoplatelet-based and nanoparticle composites to thermal interface materials, Micro & Nano Letters. 10 (2015) 296–301. https://doi.org/10.1049/mnl.2014.0689. [3] M.D. Via, J.A. King, J.M. Keith, I. Miskioglu, M.J. Cieslinski, J.J. Anderson, G.R. Bogucki, Tensile modulus modeling of carbon black/polycarbonate, carbon nanotube/polycarbonate, and exfoliated graphite nanoplatelet/polycarbonate composites, Journal of Applied Polymer Science. 124 (2012) 2269–2277. https://doi.org/10.1002/app.35276. [4] J. Xiang, L.T. Drzal, Thermal conductivity of exfoliated graphite nanoplatelet paper, Carbon. 49 (2011) 773–778. https://doi.org/10.1016/j.carbon.2010.10.003. [5] S. Kim, J. Seo, L.T. Drzal, Improvement of electric conductivity of LLDPE based nanocomposite by paraffin coating on exfoliated graphite nanoplatelets, Composites Part A: Applied Science and Manufacturing. 41 (2010) 581–587. https://doi.org/10.1016/j.compositesa.2009.05.002. [6] R.K. Pandey, C.K. Ao, W. Lim, Y. Sun, X. Di, H. Nakanishi, S. Soh, The Relationship between Static Charge and Shape, ACS Cent. Sci. 6 (2020) 704–714. https://doi.org/10.1021/acscentsci.9b01108. [7] R.B. Rosner, Conductive materials for ESD applications: an overview, IEEE Transactions on Device and Materials Reliability. 1 (2001) 9–16. https://doi.org/10.1109/7298.946455. [8] B.S. Villacorta, EFFECT OF GRAPHITIC CARBON NANOMODIFIERS ON THE ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF LINEAR LOW DENSITY POLYETHYLENE NANOCOMPOSITES, PhD, Clemson University, 2013. [9] K.S. Robinson, Variation in Static Decay Time With Surface Resistivity, IEEE Transactions on Industry Applications. 49 (2013) 2300–2307. https://doi.org/10.1109/TIA.2013.2260312.

Conference: SAMPE 2022

Publication Date: 2022/05/23

SKU: TP22-0000000835

Pages: 7

Price: $14.00