NDLI: Cellulose/boron nitride core–shell microbeads providing high thermal conductivity for thermally conductive composite sheets

Content Provider	Royal Society of Chemistry (RSC)
Author	Sakurai, Hideo Takafuji, Makoto Nagaoka, Shoji Shirosaki, Tomohiro Ihara, Hirotaka Horikawa, Maki Jodai, Takuma Ryu, Naoya Kameyama, Yoshihiro
Copyright Year	2016
Abstract	We fabricated sheets with high thermal conductivity in a way that required less filler. Our approach is as follows: (1) we used core–shell spherical microbeads as the thermally conductive filler; (2) we developed cellulose/h-boron nitride (BN) core–shell spherical microbeads using phase separation of a cellulose xanthate aqueous solution (viscose); (3) we hybridized the cellulose/h-BN core–shell microbeads with epoxy resin using compression molding. This process reduced the amount of h-BN required because the microbeads efficiently formed thermally conductive pathways among the shells in the insulating resin. The thermal conductivities of the resulting sheet in the thickness and in-plane directions were 10.6 and 15.6 W m−1 K−1, respectively, using only 48.5 vol% h-BN. In contrast, the thermal conductivities of the composite sheet with 75 vol% of naked h-BN particles were 6.31 and 22.9 W m−1 K−1 in the thickness and in-plane directions, respectively. This large difference resulted from the anisotropic structure of h-BN. The changes in thermal conductivity with h-BN content were inconsistent with percolation theory, when using the cellulose/h-BN core–shell microbeads as a filler. The thermally conductive sheets fabricated with microbeads exhibited thermal conductivities several times greater than that of sheets fabricated with naked h-BN. This indicated that thermally conductive pathways had formed in the insulating resin.
Starting Page	33036
Ending Page	33042
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	39
Journal	RSC Advances
DOI	10.1039/c6ra02950g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Xanthate Epoxy Anisotropy Resin Cellulose Percolation theory Thermal conductivity Viscose Nitride Compression molding
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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