TY - JOUR
T1 - Significant improvement of thermal conductivities for BNNS/PVA composite films via electrospinning followed by hot-pressing technology
AU - Yang, Xutong
AU - Guo, Yongqiang
AU - Han, Yixin
AU - Li, Ying
AU - Ma, Tengbo
AU - Chen, Minjiao
AU - Kong, Jie
AU - Zhu, Jiahua
AU - Gu, Junwei
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/10/15
Y1 - 2019/10/15
N2 - 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 (λ⊥) of the BNNS/PVA-III composite films with 30 wt% BNNS was 1.031 W/mK, obviously higher than that of BNNS/PVA-I (λ⊥ of 0.573 W/mK) and BNNS/PVA-II (λ⊥ of 0.694 W/mK), respectively. And the λ in parallel direction (λ∥) was significantly enhanced to 18.630 W/mK, increased by 3101.0% and 1437.1% compared to that of BNNS/PVA-I (λ∥ of 0.582 W/mK) and BNNS/PVA-II (λ∥ of 1.212 W/mK), respectively. Meantime, the glass transition temperature (Tg) and heat-resistance index (THRI) of the BNNS/PVA-III thermally conductive composite films with 30 wt% BNNS was 42.7 °C and 144.5 °C, 7.0 °C and 1.9 °C higher than that of pure PVA matrix, respectively.
AB - 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 (λ⊥) of the BNNS/PVA-III composite films with 30 wt% BNNS was 1.031 W/mK, obviously higher than that of BNNS/PVA-I (λ⊥ of 0.573 W/mK) and BNNS/PVA-II (λ⊥ of 0.694 W/mK), respectively. And the λ in parallel direction (λ∥) was significantly enhanced to 18.630 W/mK, increased by 3101.0% and 1437.1% compared to that of BNNS/PVA-I (λ∥ of 0.582 W/mK) and BNNS/PVA-II (λ∥ of 1.212 W/mK), respectively. Meantime, the glass transition temperature (Tg) and heat-resistance index (THRI) of the BNNS/PVA-III thermally conductive composite films with 30 wt% BNNS was 42.7 °C and 144.5 °C, 7.0 °C and 1.9 °C higher than that of pure PVA matrix, respectively.
KW - Boron nitride nanosheets
KW - Electrospinning
KW - Polyvinyl alcohol
KW - Thermally conductive composite films
UR - http://www.scopus.com/inward/record.url?scp=85068064339&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2019.107070
DO - 10.1016/j.compositesb.2019.107070
M3 - 文章
AN - SCOPUS:85068064339
SN - 1359-8368
VL - 175
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 107070
ER -