Enhancing the effective thermal conductivity of Kapton-type polyimide sheets via the use of hexagonal boron nitride

Haruki, Masashi; Tada, Jun; Tanaka, Keitaro; Onishi, Hajime; Tada, Yukio

doi:10.1016/j.tca.2018.01.019

Cited by 25 publications

(21 citation statements)

References 26 publications

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“…The results of SWCNT‐5 vol%/PI and CNF‐11 vol%/PI are described in Fig. a along with those of the pristine PI and a commercial Kapton sheet as references. All plotted data in the figure were obtained from either one composite or one pristine PI sheet, because it was difficult to prepare sheets with exactly the same thickness.…”

Section: Resultsmentioning

confidence: 99%

“…Relationships between the sheet thickness and experimental effective TC, and thermal resistance for the SWCNT/PI with 5 vol% of SWCNT, CNF/PI with 11 vol% of CNF, pristine PI and commercial Kapton sheets. (a): Effective TC, (b): Thermal resistance.…”

Section: Resultsmentioning

confidence: 99%

“…First, PAA was synthesized from PMDA and ODA in DMF at 20 wt% in most cases. The detailed procedure for PAA synthesis is described in a previous paper . Carbon filler was added to the PAA solution to prepare the SWCNT/PI and CNF/PI composites sheets.…”

Section: Methodsmentioning

confidence: 99%

“…The dispersion behavior was analyzed using a digital microscope (VH‐5500, Keyence Co.) and a field emission scanning electron microscope (SEM, S‐4500, Hitachi Co.). The effective TC was measured using a hand‐built apparatus based on a temperature‐gradient, steady‐state method that was validated in our previous paper . In the effective TC measurements, the sample temperatures that were estimated by averaging the temperatures of both surfaces of the sample sheet were around 37°C in most cases.…”

Section: Methodsmentioning

confidence: 99%

“…Some investigations for the effect of the addition of high thermal conductive fillers to PI on the enhancement of the effective TC of PI materials have been reported . In our previous work , we focused on Kapton‐type PI obtained from pyromellitic dianhydride (PMDA) and 4,4′‐diaminodiphenyl ether (ODA). We used hBNs as high TC fillers to examine the effect that the content and size of hBNs would exert on the effective TC of hBN/PI composites.…”

Section: Introductionmentioning

confidence: 99%

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Effective thermal conductivity for nanocarbon/polyimide and carbon nanofiber/hexagonal boron nitride/polyimide composites

et al. 2018

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Effective thermal conductivity (TC) was experimentally measured for single‐walled carbon nanotube (SWCNT)/polyimide (PI) composites with a filler content up to 8 vol% and for carbon nanofiber (CNF)/PI composites with a filler content up to 24 vol%. The measurement results indicated that the values for effective TC for SWCNT/PI and CNF/PI composites were similar up to a filler content of 8 vol%. The experimental results were then correlated via thermal conductive models proposed by Xue and by Hamilton and Crosser, and reasonable correlation results were obtained for both the SWCNT/PI and CNF/PI composite sheets. The Nielsen model capably reproduced the experimental TC values without parameter‐fitting operations. Moreover, correlations using the effective medium approach (EMA) were also performed by adjusting the interfacial resistance. Good correlation results were obtained for both the SWCNT/PI and CNF/PI composites, and the correlated interfacial resistance showed reasonable values that compared to those found in the literature. Furthermore, the effect that the coadditions of CNF and hexagonal boron nitride (hBN) exerted on the effective TC of PI was investigated for a wide range of ratios of CNF to hBN. A small amount of CNF significantly increased the effective TC of CNF/hBN/PI composites. POLYM. COMPOS., 40:3032–3039, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effective thermal conductivity for nanocarbon/polyimide and carbon nanofiber/hexagonal boron nitride/polyimide composites

et al. 2018

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Improvements in thermal conductivity and mechanical properties of HDPE/nano‐SiC composites by the synergetic effect of extensional deformation and ISBS

Yin

Yang

Cheng

et al. 2019

J of Applied Polymer Sci

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A new melt blending method under synergy of extensional deformation and in-situ bubble stretching for high-density polyethylene (HDPE) thermally conductive composites filled by nano silicon carbide (nano-SiC) was reported. Effects of loadings and mixing time of azodicarbonamide (AC) foaming agent on the properties of the composites were experimentally studied. Scanning electron microscopy imaging showed that the nano-SiC particles dispersed uniformly in the HDPE matrix with the addition of AC. The complex viscosity and storage modulus increased with increasing AC content and decreased with increasing mixing time. The mechanical properties of the composites improved with the addition of AC and proper mixing times. The thermal conductivity of the composites increased from 0.2 to 0.7 W m −1 K −1 without any damage to the mechanical properties when the mixing time increased from 2 to 6 min. These results showed that the new mixing technique enables us to prepare particle-filled thermally conductive polymer composites.

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Effect of electrical field treatment on thermal conductivity and mechanical strength of carbon nanofiber/polymer composite sheets with high filler content

Haruki

Kaneda

Tanaka

2021

J of Applied Polymer Sci

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Electrical field treatment (EFT) using alternating current was investigated for the possibility that it could enhance the out-of-plane effective thermal conductivity (TC) of carbon nanofiber (CNF)/polymer composite sheets with high concentrations of filler. Two types of polymers were used as the base: fluorinated polyimide (PI) and silicone rubber. For the CNF/fluorinated PI, the influence of frequency was clarified at 2 kV of amplitude voltage when using a CNF concentration up to 15.0 vol%. As a result, the effective TC was clearly increased by EFT, and the degree of the enhancement of effective TC was obviously greater at 0.01 Hz than at either 100 or 1 Â 10 6 Hz. Moreover, the effective TCs of two types of CNF/silicone rubber were also enhanced by EFT with 2 kV and 0.01 Hz for concentrations of CNF up to 5.2 vol%, although there is a large difference in the preparation methods between CNF/fluorinated PI and CNF/silicone rubber. Furthermore, the tensile strength of the sheets prepared with EFT implied a change in the orientational structure of CNF inside the silicone rubber matrix, although the effect of EFT on the tensile strength was smaller compared with that on the effective TC.

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Enhancing the effective thermal conductivity of Kapton-type polyimide sheets via the use of hexagonal boron nitride

Cited by 25 publications

References 26 publications

Effective thermal conductivity for nanocarbon/polyimide and carbon nanofiber/hexagonal boron nitride/polyimide composites

Effective thermal conductivity for nanocarbon/polyimide and carbon nanofiber/hexagonal boron nitride/polyimide composites

Improvements in thermal conductivity and mechanical properties of HDPE/nano‐SiC composites by the synergetic effect of extensional deformation and ISBS

Effect of electrical field treatment on thermal conductivity and mechanical strength of carbon nanofiber/polymer composite sheets with high filler content

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