Journal
COMPOSITES PART B-ENGINEERING
Volume 175, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2019.107070
Keywords
Polyvinyl alcohol; Boron nitride nanosheets; Electrospinning; Thermally conductive composite films
Funding
- National Natural Science Foundation of China [51773169]
- Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province of China [2019JC-11]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JM5001]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX201920]
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Research and development on polymer composites with high thermal conductivities and ideal thermal stabilities have become one of the hot topics in functional composites. In this work, boron nitride nanosheets/polyvinyl alcohol (BNNS/PVA) thermally conductive composite films were respectively prepared from ball milling (BNNS/PVA-I), directional freeze-drying (BNNS/PVA-II) and electrospinning technology (BNNS/PVA-III), followed by hot-pressing method. BNNS/PVA-III thermally conductive composite films had better comprehensive properties than that of BNNS/PVA-(I-II) composite films. Thermal conductivity coefficient in vertical direction (lambda(perpendicular to)) of the BNNS/PVA-III composite films with 30 wt% BNNS was 1.031 W/mK, obviously higher than that of BNNS/PVA-I (lambda(perpendicular to) of 0.573 W/mK) and BNNS/PVA-II (lambda(perpendicular to) of 0.694 W/mK), respectively. And the lambda in parallel direction (lambda(parallel to)) was significantly enhanced to 18.630 W/mK, increased by 3101.0% and 1437.1% compared to that of BNNS/PVA-I (lambda(parallel to) of 0.582 W/mK) and BNNS/PVA-II (lambda(parallel to) of 1.212 W/mK), respectively. Meantime, the glass transition temperature (T-g) and heat-resistance index (T-HRI) of the BNNS/PVA-III thermally conductive composite films with 30 wt% BNNS was 42.7 degrees C and 144.5 degrees C, 7.0 degrees C and 1.9 degrees C higher than that of pure PVA matrix, respectively.
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