Highly Thermally Conductive Polyimide Composite Films with Excellent Thermal and Electrical Insulating Properties

Abstract Thermally conductive materials with electrically insulating properties have been extensively investigated for thermal management of electronic devices. The combined properties of high thermal conductivity, structural stability, corrosion resistance and electric resistivity make hexagonal boron nitride (h-BN) a promising candidate for this purpose. Theoretical studies have revealed that h-BN has a high in-plane thermal conductivity up to 400 - 800 W m−1 K−1 at room temperature. However, it is still a big challenge to achieve high thermally conductive h-BN thick films that are commercially feasible due to its poor mechanical properties. On the other hand, many polymers exhibit advantages for flexibility. Thus, combining the merits of polymer and the high thermal conductivity of h-BN particles is considered as a promising solution for this issue. In this work, orientated PVP/h-BN films were prepared by electrospinning and a subsequent mechanical pressing process. With the optimized h-BN loading, a PVP/h-BN composite film with up to 22 W m−1 K−1 and 0.485 W m−1 K−1 for in-plane and through-plane thermal conductivity can be achieved, respectively. We believe this work can help accelerate the development of h-BN for thermal management applications.

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Thermally conductive nanostructured, aramid dielectric composite films with boron nitride nanosheets

Composites Science and Technology ◽

10.1016/j.compscitech.2019.02.006 ◽

2019 ◽

Vol 175 ◽

pp. 85-91 ◽

Cited By ~ 12

Author(s):

Meiyan Lin ◽

Yinghui Li ◽

Ke Xu ◽

Yanghao Ou ◽

Lingfeng Su ◽

...

Keyword(s):

Boron Nitride ◽

Composite Films ◽

Boron Nitride Nanosheets ◽

Dielectric Composite ◽

Thermally Conductive

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Synergistic Effects of Various Ceramic Fillers on Thermally Conductive Polyimide Composite Films and Their Model Predictions

Polymers ◽

10.3390/polym11030484 ◽

2019 ◽

Vol 11 (3) ◽

pp. 484 ◽

Cited By ~ 7

Author(s):

Heeseok Song ◽

Byoung Kim ◽

Yong Kim ◽

Youn-Sang Bae ◽

Jooheon Kim ◽

...

Keyword(s):

Thermal Conductivity ◽

Hybrid System ◽

Prediction Models ◽

Synergistic Effects ◽

Composite Films ◽

Hybrid Filler ◽

Model Predictions ◽

Thermally Conductive ◽

Ceramic Fillers ◽

Polyimide Matrix

In this study, thermally conductive composite films were fabricated using an anisotropic boron nitride (BN) and hybrid filler system mixed with spherical aluminum nitride (AlN) or aluminum oxide (Al2O3) particles in a polyimide matrix. The hybrid system yielded a decrease in the through-plane thermal conductivity, however an increase in the in-plane thermal conductivity of the BN composite, resulting from the horizontal alignment and anisotropy of BN. The behavior of the in-plane thermal conductivity was theoretically treated using the Lewis–Nielsen and modified Lewis–Nielsen theoretical prediction models. A single-filler system using BN exhibited a relatively good fit with the theoretical model. Moreover, a hybrid system was developed based on two-population approaches, the additive and multiplicative. This development represented the first ever implementation of two different ceramic conducting fillers. The multiplicative-approach model yielded overestimated thermal conductivity values, whereas the additive approach exhibited better agreement for the prediction of the thermal conductivity of a binary-filler system.

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Effects of Additive Elements on Electrical Properties of Tantalum Oxide Films.

MRS Proceedings ◽

10.1557/proc-378-1025 ◽

1995 ◽

Vol 378 ◽

Cited By ~ 3

Author(s):

Hisayoshi Fujikawa ◽

Yasunori Taga

Keyword(s):

Electrical Properties ◽

Conduction Mechanism ◽

Defect Density ◽

Tantalum Oxide ◽

Composite Films ◽

Current Voltage ◽

Current Voltage Characteristics ◽

Electrical Conduction Mechanisms ◽

Insulating Properties ◽

Nordheim Tunneling

AbstractTa2O5-based composite films prepared by magnetron sputtering have been investigated with respect to their dielectric properties. As additive third oxides, Y2O3 and WO3 were found to be effective in improving insulating properties without decreasing their dielectric constant. Furthermore, electrical properties of Ta2O5-Y2O3 films were investigated by measuring the current-voltage characteristics in the temperature range from 100 to 330 K. Measurement of temperature dependence of the leakage current revealed that the conduction mechanism at RT changed from the Poole-Frenkel type to the Fowler-Nordheim tunneling type by adding Y2O3 into Ta2O5. Based on the detailed analysis of the results, it is concluded that the addition of Y2O3 into the Ta2O5 film is effective in the reduction of defect density without high-temperature annealing and the alteration of electrical conduction mechanisms of the films.

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Thermally conductive composite films of hexagonal boron nitride and polyimide with affinity-enhanced interfaces

Journal of Materials Chemistry ◽

10.1039/b924997d ◽

2010 ◽

Vol 20 (14) ◽

pp. 2749 ◽

Cited By ~ 255

Author(s):

Kimiyasu Sato ◽

Hitomi Horibe ◽

Takashi Shirai ◽

Yuji Hotta ◽

Hiromi Nakano ◽

...

Keyword(s):

Boron Nitride ◽

Hexagonal Boron Nitride ◽

Composite Films ◽

Conductive Composite ◽

Thermally Conductive

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Dual Bio-Inspired Design of Highly Thermally Conductive and Superhydrophobic Nanocellulose Composite Films

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c01425 ◽

2020 ◽

Vol 12 (9) ◽

pp. 11115-11125 ◽

Cited By ~ 6

Author(s):

Dechao Hu ◽

Wenshi Ma ◽

Zhilin Zhang ◽

Yong Ding ◽

Li Wu

Keyword(s):

Composite Films ◽

Thermally Conductive

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Sandwich structured RGO/CNF/RGO composite films for superior mechanical and thermally conductive properties

Cellulose ◽

10.1007/s10570-020-03150-5 ◽

2020 ◽

Vol 27 (9) ◽

pp. 5055-5069

Author(s):

Bo Shan ◽

Yuzhu Xiong ◽

Yihang Li ◽

Hang Yang ◽

Yuanfu Chen

Keyword(s):

Composite Films ◽

Thermally Conductive ◽

Conductive Properties

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Incorporating MXene into Boron Nitride/Poly(Vinyl Alcohol) Composite Films to Enhance Thermal and Mechanical Properties

Polymers ◽

10.3390/polym13030379 ◽

2021 ◽

Vol 13 (3) ◽

pp. 379

Author(s):

Seonmin Lee ◽

Jooheon Kim

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Boron Nitride ◽

Composite Film ◽

Vinyl Alcohol ◽

Composite Films ◽

Poly Vinyl Alcohol ◽

Thermal And Mechanical Properties ◽

Conduction Path ◽

Thermally Conductive

Aggregated boron nitride (ABN) is advantageous for increasing the packing and thermal conductivity of the matrix in composite materials, but can deteriorate the mechanical properties by breaking during processing. In addition, there are few studies on the use of Ti3C2 MXene as thermally conductive fillers. Herein, the development of a novel composite film is described. It incorporates MXene and ABN into poly(vinyl alcohol) (PVA) to achieve a high thermal conductivity. Polysilazane (PSZ)-coated ABN formed a heat conduction path in the composite film, and MXene supported it to further improve the thermal conductivity. The prepared polymer composite film is shown to provide through-plane and in-plane thermal conductivities of 1.51 and 4.28 W/mK at total filler contents of 44 wt.%. The composite film is also shown to exhibit a tensile strength of 11.96 MPa, which is much greater than that without MXene. Thus, it demonstrates that incorporating MXene as a thermally conductive filler can enhance the thermal and mechanical properties of composite films.

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