Synergistic construction of thermally conductive network in polybenzoxazine with boron nitride hybrid fillers
Wang Yi, Wei Wu, D. Drummer
Jan 22, 2020
Citations
4
Citations
Journal
Materials Research Express
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Key Takeaway Key Takeaway: Hybrid mBN/nBN fillers at a 1:1 ratio significantly improve thermal conductivity in polybenzoxazine composites, but may dampen curing behavior and thermal stability.
Abstract
Synergistic effect between micrometer boron nitride/nanometer boron nitride (mBN/nBN) at different mass ratio was investigated. Hybrid fillers of mBN/nBN at certain ratio (mBN:nBN = 1:1) performed best synergistic improvement of thermal conductivities of mBN/nBN/polybenzoxazine (mBN/nBN/PBz) composites fabricated via ball-milling followed by a hot-compression method. The effect of hybrid mBN/nBN fillers on thermally conductive coefficient (λ), curing behavior and thermal stability was also studied. The λ value was improved from 0.2276 W · m−1 · K−1 for pristine PBz to 0.9196 W · m−1 · K−1 for (m/n)BN/PBz composites with 25 wt% hybrid filler. Agari model fitting revealed that mBN/nBN hybrid fillers constructed thermally conductive networks much easier than mBN did. The curing behavior and thermal stability of (m/n)BN/PBz composites were dampened with the addition of m/n hybrid fillers. Also, the addition amount of (m/n)BN hybrid filler had great influence on filler alignment in the matrix.