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- Title
Polymer/magnesia nanofiber composite sheets with anisotropic high thermal conductivity.
- Authors
Ohgoshi, Akiyoshi; Takahashi, Kazuya; Nakane, Koji
- Abstract
The performance of an electronic product depends on how efficiently it can dissipate the heat of its parts. As a result, intensive ongoing research seeks to improve the thermal conductivity of polymeric materials. In this study, we investigate magnesia nanofibers as thermal conductive filler in the resin and compared them to conventional spherical filler. Magnesia nanofiber mats were fabricated by electrospinning a solution of polyvinyl alcohol and magnesium ethoxide mixtures; they were then impregnated with resins to obtain a composite sheet. We assessed the thermal conductivity of the composite sheet. The resin sheet with aligned magnesia nanofibers content (49 vol%) had high thermal conductivity (12.9 W/mK) in the direction parallel to the aligned magnesia nanofibers. The conductivity increased in proportion to magnesia nanofiber content. In addition, the magnesia nanofiber composite sheet showed anisotropic thermal conductivity derived from the fiber direction and had electrical insulation (7.7 × 1012 Ω/□), and flexibility. These electrically insulating sheets with anisotropy in thermal conductivity would be useful in designing effective heat removal paths in electronic devices.
- Subjects
THERMAL conductivity; POLYMERS; POLYVINYL alcohol; ELECTRIC insulators &; insulation; MAGNESIUM oxide
- Publication
Journal of Materials Science: Materials in Electronics, 2019, Vol 30, Issue 23, p20566
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-019-02421-7