Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 214, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2021.108995
Keywords
Through-plane thermal conductivity; Polymer; Boron nitride nanosheets; Vertical orientation
Categories
Funding
- Innovative ResearchGroups of the National Natural Science Foundation of China [51721091]
- Key Labo-ratory of Advanced Technologies of Materials, Ministry of Education China, Southwest Jiaotong University [KLATM202010]
- Natural Science Foun-dation of Jiangsu Province [BK20200501]
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In this study, high thermal conductivity regenerated cellulose/boron nitride nanosheets filaments were prepared via wet-spinning method, and a tailored polydimethylsiloxane/regenerated cellulose/boron nitride nanosheets filaments nanocomposite with hierarchical assembled architectures was successfully fabricated. This nanocomposite provides effective solutions to the thickness-direction heat transfer issues of electronic devices, with tactfully engineered phonon pathways resulting in remarkable through-plane thermal conductivity performance.
With rapid evolution of advanced microelectronic devices, thermally conductive polymeric materials with impressive through-plane thermal conductivity (kappa(perpendicular to)) and remarkable electrical insulating properties are urgently demanded for efficient thermal management. Assembly of boron nitride nanosheets (BNNS) into polymer matrix with vertically interconnected conformation was usually adopted. However, impeded by inferior oriented degree and insufficient overlapped interconnection of BNNS, polymer/BNNS nanocomposites still suffered from a limited enhancement of kappa(perpendicular to). In this work, we firstly prepared regenerated cellulose (RC)/BNNS filaments with high thermal conductivity via wet-spinning method. Then, a tailored polydimethylsiloxane (PDMS)/(RC/BNNS) filaments nanocomposite with hierarchical assembled architectures is successfully fabricated with customized-mold vacuum impregnation. Numerous bunches of macroscopical hybrid filaments penetrate through the nanocomposite from the bottom to the up, while vertically aligned microscopical BNNS with efficient filler interconnections confined within filaments provide many uniaxial thermal pathways. Attributed to tactfully engineered phonon pathways, the as-prepared material exhibits a remarkable kappa(perpendicular to) up to 5.13 W/m K at 27.05 vol% BNNS loading, outperforming the characters in most literatures. Along with excellent electrical resistance and extraordinary thermal management performances, this type of nanocomposite with hierarchical structures provides an effective strategy to thickness-direction heat transfer issues of electronic devices.
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