Thermal conductivity of a polymer composite

With the fast-developing miniaturization and integration of microelectronics packaging materials, ultrahigh-voltage electrical devices, light-emitting diodes (LEDs), and in areas which require good heat dissipation and low thermal expansion, the investigations on the polymeric composites with highly thermal conductivities and excellent thermal stabilities are urgently required, which would be beneficial to transferring the heat to the outside of the products, finally to effectively avoid substantial overheating and prolong their working life. Our article reviews recent progress in the classification, measurement methods, model and equations, mechanisms, commonly used thermally conductive fillers, and the correlative fabrication methods for the thermally conductive polymeric composites, aiming to understand and grasp how to enhance the λ value effectively. And future perspectives, focusing scientific problems and technical difficulties of the present thermally conductive polymeric composites are also described and evaluated.

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“…Its mathematical expression is listed as Eqs. 5 and 6 [79][80][81] (above: upper bound equation, below: lower bound equation).…”

Section: Maxwell-eucken Modelmentioning

confidence: 99%

“…Heat does not spread like waves as well as in the crystalline polymers. The thermal conduction is random and slow, resulting in low λ value [79]. Figure 11 shows the schematic diagram for thermally conductive mechanism of the amorphous polymers.…”

Section: Mechanisms Of the Intrinsic Thermally Conductive Polymersmentioning

confidence: 99%

A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods

Yang

Liang

et al. 2018

Adv Compos Hybrid Mater

302

124

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“…Vertical double percolation (VDP), 9) a honeycomb-like structure, 10) and self-assembly 11) techniques have been applied to the controlled assembly of 1-D and 2-D nanofillers. VDP and selfassembly alter the interactions between fillers by controlling their electrical or chemical properties, whereas the honeycomb-like technique uses polymer balls as a matrix to facilitate the physical separation of domains between the polymer and inorganic boron nitride (BN) fillers prior to thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

“…VDP and selfassembly alter the interactions between fillers by controlling their electrical or chemical properties, whereas the honeycomb-like technique uses polymer balls as a matrix to facilitate the physical separation of domains between the polymer and inorganic boron nitride (BN) fillers prior to thermal treatment. 10) Electric fields, 12) shear forces 13) and magnetic fields 14) have been applied as external torque sources for the anisotropic orientation of nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Texture-controlled hybrid materials fabricated using nanosecond technology

Cho

Nakayama

Huynh

et al. 2016

J. Ceram. Soc. Japan

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The controlled assembly of micro-and nano-ceramic fillers in polymer nanocomposites provides robust properties such as wetting, adhesion, thermal conductivity, electrical insulation and optical activity, and enable the extended application of these hybrid materials as thermal interfacing materials in microelectronics and for energy conversion. However, the required properties can only be obtained either by homogeneous mixing or by anisotropic orientation of a large amount (>50 vol.%) of expensive fillers, which is economically inefficient. Here we propose a strategy for tuning the orientation and assembly of ceramic boron nitride nanofillers in a polymer nanocomposite using a small amount (<5 vol.%) of filler to enhance thermal conduction. The texture of the BN fillers is tuned by application of a nanosecond pulse electric field and a superconductor magnetic field (10 T); the three-dimensional structure of the products was analyzed using 3-D X-ray CT scanning. The enhanced anisotropic orientation and thermal properties of the products were assessed as a function of the structural variation of the boron nitride fillers in the polymer.

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“…1)18) The composite materials used for insulation in electronic devices are required to possess high thermal conductivity for heat dissipation. 4), 5) Therefore, highly thermally conductive ceramic particles, such as alumina (Al 2 O 3 ), 3),6)8) boron nitride (BN), 9)14) and aluminum nitride (AlN) 14)18) have been widely used in these applications. Among these, AlN particles have been particularly studied because of their particularly high thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of highly water-resistant AlN particles with hybrid α-Al<sub>2</sub>O<sub>3</sub>/organic layers

Tanaka

Hojo

Kagawa

et al. 2014

J. Ceram. Soc. Japan

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The water resistance of AlN particles was improved by surface coating with hybrid ¡-Al 2 O 3 /organic layers. To maintain thermal conductivity, the higher-thermal-conductivity ¡-Al 2 O 3 layer was designed to cover most of the AlN surface, and the lowerthermal-conductivity organic layer was formed on the remaining area. Scanning electron microscopy, energy dispersive X-ray spectrometry and thermogravimetric analyses of the particles revealed that the small amount of organic layer was filling the cracks in the ¡-Al 2 O 3 layer. The water resistant property was evaluated by a water immersion test. The pH of water dispersing the particles with hybrid layers was less than that of water dispersing the particles coated only with ¡-Al 2 O 3 or organic layers, which indicated that the particles with hybrid layers had improved water resistance. The particles have applications in polymer composites for insulation in electronic devices which require improved reliability.

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Thermal conductivity of a polymer composite

Cited by 248 publications

References 21 publications

A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods

A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods

Texture-controlled hybrid materials fabricated using nanosecond technology

Fabrication of highly water-resistant AlN particles with hybrid α-Al<sub>2</sub>O<sub>3</sub>/organic layers

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