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Cellulose/boron nitride core–shell microbeads providing high thermal conductivity for thermally conductive composite sheets
| Content Provider | Semantic Scholar |
|---|---|
| Author | Nagaoka, Shoji Jodai, Takuma Kameyama, Yoshihiro Horikawa, Maki Shirosaki, Tomohiro Ryu, Naoya Takafuji, Makoto Sakurai, Hideo Ihara, Hirotaka |
| 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 | PDF HTM / HTML |
| DOI | 10.1039/C6RA02950G |
| Volume Number | 6 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c6/ra/c6ra02950g/c6ra02950g1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C6RA02950G |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
