Double-segregated multiwalled carbon nanotube/silicone composites with large electrical to thermal conductivity ratios via in-situ silicone emulsion polymerization

Published on 2020-05-22T12:12:13Z (GMT) by
<div><p>Polymer composites with a high electrical conductivity (<i>σ</i>) to thermal conductivity (<i>k</i>) ratio have been intensively investigated in recent years. While highly conductive materials, such as metallic fillers or conducting polymers, were used to enhance <i>σ</i>, microstructural engineering was used to decrease <i>k</i> by forming porous structures, such as aerogels or 3D networks. These structures, however, were mechanically vulnerable and could only have limited applications. In this study, multiwalled carbon nanotube /silicone composites with a high <i>σ/k</i> ratio were developed by forming a double-segregated multiwalled carbon nanotube network in the porous body of the composites. The unique microstructure of the composites was created by a novel fabrication process: layer-by-layer deposition with in-situ polymerization of silicone emulsion particles dispersed in a water solvent. This novel process yielded very thick films, >200 µm, with high <i>σ/k</i> values, ∼2 × 10<sup>4</sup> (S/m)/(W/m·K). These high <i>σ/k</i> composites can be used for various applications, such as resistive heating elements, thermoelectric materials, and wearable thermotherapy.</p></div>

Cite this collection

Kim, Dongouk; Lee, Sang-Eui; Sohn, Yoonchul (2020): Double-segregated multiwalled carbon nanotube/silicone composites with large electrical to thermal conductivity ratios via in-situ silicone emulsion polymerization. SAGE Journals. Collection. https://doi.org/10.25384/SAGE.c.4989326.v1