Abstract
The effect of polycarbonate (PC) matrix viscosity on the thermal conductivity of a PC/vapor-grown carbon fiber (VGCF) composite was investigated in this study in terms of the rheological properties of the PC/VGCF using two types of VGCF. Two types of VGCF, which have different aspect ratios (VGCF-h has an aspect ratio of 40, whereas VGCF-s has an aspect ratio of 100), were added to two types of PC with different viscosities. The storage modulus (G′) and loss modulus (G″) of the PC slightly increased and thermal conductivity gradually increased with the content of VGCF-h. By adding VGCF-s to low-viscosity PC, rheological properties originating in the network structure were observed. Thermal conductivity of low-viscosity PC drastically increased with the content of VGCF-s. By analyzing the length of VGCF in each composite, we found that the length of VGCF decreased with mixing. It was also easy to shorten VGCF in high-viscosity PC. We clarified that the thermal conductivity of PC/VGCF could be controlled with the viscosity of the polymer matrix because the spread of the network structure of VGCF and/or the breaking of VGCF depended on the viscosity of the polymer matrix.
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Acknowledgements
We thank Mr Yuki Kurome, a student at the University of Fukui, Japan, for measuring the length distributions of VGCF in PC/VGCF composites and Teijin Chemicals, Japan, for supplying the PC resin.
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Nithikarnjanatharn, J., Ueda, H., Tanoue, S. et al. The rheological behavior and thermal conductivity of melt-compounded polycarbonate/vapor-grown carbon fiber composites. Polym J 44, 427–432 (2012). https://doi.org/10.1038/pj.2011.149
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DOI: https://doi.org/10.1038/pj.2011.149
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