Porous boron nitride/polyimide composite films with high thermal diffusivity and low dielectric properties via high internal phase Pickering emulsion method

Yang, Kwansoo; Kang, Yi Young; Ahn, Hyun Jeong; Kim, Dong-Gyun; Park, No Kyun; Choi, Siyoung Q.; Won, Jong Chan; Kim, Yun Ho

doi:10.1016/j.jiec.2019.10.010

Cited by 33 publications

(14 citation statements)

References 32 publications

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“…It is as shown in Figure 3 a. The distinct discrepancies between the ε′ of the porous nHA/S composites might be due to the dependency of ε′ of porous composites on the microstructural features and the proportions of participating materials [ 32 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

Regression Analysis of the Dielectric and Morphological Properties for Porous Nanohydroxyapatite/Starch Composites: A Correlative Study

You

Cheng

Nasir

et al. 2022

IJMS

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This paper aims to investigate the dielectric properties, i.e., dielectric constant (ε′), dielectric loss factor (ε″), dielectric tangent loss (tan δ), electrical conductivity (σ), and penetration depth (Dp), of the porous nanohydroxyapatite/starch composites in the function of starch proportion, pore size, and porosity over a broad band frequency range of 5 MHz–12 GHz. The porous nanohydroxyapatite/starch composites were fabricated using different starch proportions ranging from 30 to 90 wt%. The results reveal that the dielectric properties and the microstructural features of the porous nanohydroxyapatite/starch composites can be enhanced by the increment in the starch proportion. Nevertheless, the composite with 80 wt% of starch proportion exhibit low dielectric properties (ε′, ε″, tan δ, and σ) and a high penetration depth because of its highly interconnected porous microstructures. The dielectric properties of the porous nanohydroxyapatite/starch composites are highly dependent on starch proportion, average pore size, and porosity. The regression models are developed to express the dielectric properties of the porous nanohydroxyapatite/starch composites (R2 > 0.96) in the function of starch proportion, pore size, and porosity from 1 to 11 GHz. This dielectric study can facilitate the assessment of bone scaffold design in bone tissue engineering applications.

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Section: Resultsmentioning

confidence: 99%

Regression Analysis of the Dielectric and Morphological Properties for Porous Nanohydroxyapatite/Starch Composites: A Correlative Study

You

Cheng

Nasir

et al. 2022

IJMS

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“…Dielectric constant is closely related to the characteristics of the material itself and the density of polarized molecules in the material [16]. It is known that the dielectric constant of the pure polyimide film is generally between 3.0 and 3.4, and that of alumina is 8.6-10 [17,18]. With the increase in alumina amount, the number of polar groups and phase interface between the organic phase and the inorganic phase in the composite coating increases, which might lead to an increase in chemical capacity and the dielectric coefficient increases.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Polyimide-alumina Composite Coatings by Liquid Flame Spray

et al. 2020

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Polyimide is type of heterocyclic polymer compound characterized by an imide ring structure. The aromatic ring structure in polyimide facilitates good electrical properties, mechanical properties, thermal properties and radiation resistance, etc. It is widely used in the aerospace field, in electronic components and in the semiconductor industry. Traditional methods for the preparation of polyimide films have different limitations. Here, a new one-step method was established to prepare polyimide coatings using liquid flame spray. The effect of different mass fraction on the surface and cross section structure characteristics of polyimide coatings was studied. The formation process of the polyimide-alumina composite coatings was analyzed using single particles and coatings with different amount of alumina. The composite coating shows a flat and dense structure and excellent dielectric properties. The results shed light on construction of polymer-inorganic composite layers for widespread applications.

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“…Water-soluble poly(amic acid) (PAA) based on PMDA-DMBZ was prepared following the methods explained in our previous reports [ 30 ]. Notably, to prepare an aqueous PAA solution, DMEA was used as a water dissolution agent [ 31 ].…”

Section: Methodsmentioning

confidence: 99%

Highly Stable Porous Polyimide Sponge as a Separator for Lithium-Metal Secondary Batteries

et al. 2020

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To inhibit Li-dendrite growth on lithium (Li)-metal electrodes, which causes capacity deterioration and safety issues in Li-ion batteries, we prepared a porous polyimide (PI) sponge using a solution-processable high internal-phase emulsion technique with a water-soluble PI precursor solution; the process is not only simple but also environmentally friendly. The prepared PI sponge was processed into porous PI separators and used for Li-metal electrodes. The physical properties (e.g., thermal stability, liquid electrolyte uptake, and ionic conductivity) of the porous PI separators and their effect on the Li-metal anodes (e.g., self-discharge and open-circuit voltage properties after storage, cycle performance, rate capability, and morphological changes) were investigated. Owing to the thermally stable properties of the PI polymer, the porous PI separators demonstrated no dimensional changes up to 180 °C. In comparison with commercialized polyethylene (PE) separators, the porous PI separators exhibited improved wetting ability for liquid electrolytes; thus, the latter improved not only the physical properties (e.g., improved the electrolyte uptake and ionic conductivity) but also the electrochemical properties of Li-metal electrodes (e.g., maintained stable self-discharge capacity and open-circuit voltage features after storage and improved the cycle performance and rate capability) in comparison with PE separators.

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Porous boron nitride/polyimide composite films with high thermal diffusivity and low dielectric properties via high internal phase Pickering emulsion method

Cited by 33 publications

References 32 publications

Regression Analysis of the Dielectric and Morphological Properties for Porous Nanohydroxyapatite/Starch Composites: A Correlative Study

Regression Analysis of the Dielectric and Morphological Properties for Porous Nanohydroxyapatite/Starch Composites: A Correlative Study

Facile Fabrication of Polyimide-alumina Composite Coatings by Liquid Flame Spray

Highly Stable Porous Polyimide Sponge as a Separator for Lithium-Metal Secondary Batteries

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