Boron Nitride-Filled Linear Low-Density Polyethylene for Enhanced Thermal Transport: Continuous Extrusion of Micro-Textured Films

Abstract

With shrinking size of electronic devices, increasing performance and accompanying heat dissipation, there is a need for efficient removal of this heat through packaging materials. Polymer materials are attractive packaging materials given their low density and electrical insulating properties, but they lack sufficient thermal conductivity that inhibits heat transfer rate. Hexagonal boron nitride (BN) possesses excellent thermal conductivity and is also electrically insulating, therefore BN-filled polymer composites were investigated in this study. Results showed successful continuous extrusion of BN-filled linear low-density polyethylene through micro-textured dies that is a scalable manufacturing process. Through-thickness thermal conductivity measurements established that 30 vol% BN content led to an over 500% increase in thermal conductivity over that of pure polymer. Textured film surface provided about a 50% increase in surface area when compared with non-textured films. This combination of increased surface area and enhanced thermal conductivity of BN-filled textured films indicates their potential application for improved convective thermal transport.

Preparations and Thermal Properties of PDMS-AlN-Al2O3 Composites through the Incorporation of Poly(Catechol-Amine)-Modified Boron Nitride Nanotubes

“…This change can be associated with the geometrical advantages of BNNT and its relative effective dispersion, and the surface treatment compatibility with the polymeric composite. This stipulates the relative contribution of BNNT on the thermal composite material [25]. The structural attributes and elemental characteristics of BNNT before and after modification are presented in Figures 2d-g and S1a-d through TEM images and TEM-EDX.…”

“…This change can be associated with the geometrical advantages of BNNT and its relative effective dispersion, and the surface treatment compatibility with the polymeric composite. This stipulates the relative contribution of BNNT on the thermal composite material [25].…”

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

“…), graphite, carbon fibers, carbon nanotubes, and ceramic particles (Al 2 O 3 , SiC, and BN) have been incorporated into the polymer matrix to enhance various customized properties, such as heat resistance, thermal conductivity, and mechanical properties. [52][53][54][55][56] Micro/nanolayer coextrusion based on layer multiplication has recently attracted considerable interest in the polymer industry. [57] This novel polymer processing technology can be used to manufacture films consisting of hundreds of layers with thicknesses less than 100 nm, which can be applied in light-reflective films, optical lenses, and soundproofing film/foam multilayered composites.…”

Selective Distribution of Filler in PMMA/PLA/BN Thermally Conductive Composites: Theoretical Prediction and Experimental Investigation

“…Wei et al 16 prepared thermal conductive phase-change materials (PCMs) composed of poly(ethylene glycol) (PEG) and BN, whose TC was 2.86 times that of neat PEG. Guzdemir et al 17 studied BN-filled polymer composites and found that 30 vol % BN led to an increment of 500% in TC as compared with neat polymer.…”