Open AccessSynergistic construction of thermally conductive network in polybenzoxazine with boron nitride hybrid fillers
Author(s) -
Yi Wang,
Wei Wu,
Dietmar Drummer,
Wanting Shen,
Chao Liu,
Ning Wang
Publication year - 2019
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab6e7d
Subject(s) - materials science , boron nitride , composite material , thermal stability , curing (chemistry) , filler (materials) , electrical conductor , nitride , boron , chemical engineering , chemistry , organic chemistry , layer (electronics) , engineering
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.