Journal
COMPOSITES PART B-ENGINEERING
Volume 164, Issue -, Pages 732-739Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2019.01.099
Keywords
Thermally conductive composites; Functionalized boron nitride; Thermal resistance; Electrospinning
Funding
- Foundation of National Natural Science Foundation of China [51773169, 51403175]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JM5001]
- State Key Laboratory of Solid Lubrication of Lanzhou Institute of Chemical Physics [LSL-1715]
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Fluorine-containing polyimide (PI) with low dielectric constant (epsilon) value was firstly synthesized by a poly-condensation reaction of 4, 4-(hexafluoroisopropyl) diphthalic anhydride (6FDA), 1, 3, 4-triphenyldiether diamine (APB) and 1, 3-bis(3-aminopropyl) tetramethyldisiloxane (GAPD). gamma-glycidoxypropyltrimethoxysilane (KH-560) and aminopropylisobutyl polyhedral oligomeric silsesquioxane (NH2-POSS) were synchronously performed to functionalize the surface of boron nitride (f-BN) fillers, which were then utilized as thermally conductive fillers to fabricate the corresponding f-BN/PI composites. NH2-POSS was successfully grafted on the surface of BN fillers. All the f-BN/PI composites presented better thermal conductivities, dielectric and thermal properties than those of BN/PI composites at the same addition of BN fillers. The obtained thermal conductivity coefficient (lambda) of the f-BN/PI composites with 30 wt% f-BN was 0.71 W/mK, higher than that of BN/PI composites with 30 wt% BN (lambda of 0.69 W/mK). Modified Hashin-Shtrikman model demonstrated that f-BN possessed relatively lower thermal resistance with PI matrix. Meantime, the corresponding epsilon and dielectric loss tangent (tan delta) value of the f-BN/PI composites was decreased to 3.32 and 0.004, respectively, lower than that of BN/PI composites with 30 wt% BN (epsilon of 3.77 and tan delta of 0.007). Moreover, the corresponding heat resistance index (T-HRI) and glass transition temperature (T-g) of the f-BN/PI composites was further enhanced to 280.2 degrees C and 251.7 degrees C, respectively.
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