Facial fabrication of aramid composite insulating paper with high strength and good thermal conductivity

Li, Mengjie; Zhu, Yufan; Chen, Teng

doi:10.1016/j.coco.2020.100370

Cited by 42 publications

(19 citation statements)

References 37 publications

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“…From the SEM image of Kevlar yarn ( Supplementary Materials , Figure S8 ), it can be seen that ANF had a very high aspect ratio. The original Kevlar yarn was about 10–15 μm in diameter ( Supplementary Materials , Figure S9b ), consistent with the literature [ 60 , 61 , 62 ], with a slight granular surface protuberance, which was caused by soaking in acetone and further cleaning by ultrasound before dispersing in DMSO solution. In order to break this connection, the deprotonation of amide groups on ANF was needed [ 62 , 63 , 64 ].…”

Section: Resultssupporting

confidence: 88%

Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

et al. 2021

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The development of highly thermally conductive composites with excellent electrical insulation has attracted extensive attention, which is of great significance to solve the increasingly severe heat concentration issue of electronic equipment. Herein, we report a new strategy to prepare boron nitride nanosheets (BNNSs) via an ion-assisted liquid-phase exfoliation method. Then, silver nanoparticle (AgNP) modified BNNS (BNNS@Ag) was obtained by in situ reduction properties. The exfoliation yield of BNNS was approximately 50% via the ion-assisted liquid-phase exfoliation method. Subsequently, aramid nanofiber (ANF)/BNNS@Ag composites were prepared by vacuum filtration. Owing to the “brick-and-mortar” structure formed inside the composite and the adhesion of AgNP, the interfacial thermal resistance was effectively reduced. Therefore, the in-plane thermal conductivity of ANF/BNNS@Ag composites was as high as 11.51 W m−1 K−1, which was 233.27% higher than that of pure ANF (3.45 W m−1 K−1). The addition of BNNS@Ag maintained tensile properties (tensile strength of 129.14 MPa). Moreover, the ANF/BNNS@Ag films also had good dielectric properties and the dielectric constant was below 2.5 (103 Hz). Hence, the ANF/BNNS@Ag composite shows excellent thermal management performance, and the electrical insulation and mechanical properties of the matrix are retained, indicating its potential application prospects in high pressure and high temperature application environments.

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Section: Resultssupporting

confidence: 88%

Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

et al. 2021

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“…In addition, the existence of micro air voids in the neat ANF films is conducive to the decrease of dielectric constant because of the extremely low dielectric constant of air. Similar phenomena are reported in the work of Lin et al and Li et al. , By interlacing rigid 1D ANFs with soft PVA molecular gules via strong intermolecular hydrogen bonding, a compact structure with less micro air voids is constructed, resulting in a slight increase of dielectric constant for ANF/PVA. Moreover, the ANF/PVA/BNNS-OH composite films have a gradually increased dielectric constant with the increase of BNNS-OH contents, due to its high dielectric constant (∼4).…”

Section: Resultssupporting

confidence: 86%

“…Although the further introduction of brittle BNNS-OH gradually deteriorates the mechanical properties of composites films (Figure b,c), the ANF/PVA/BNNS-OH still possesses a high tensile strength of 137 MPa at a 40 wt % BNNS-OH loading, behaving superior to those of previous reported BNNS composites (Figure d and Table S1). − In particular, the ANF/PVA/BNNS-OH composite films can be easily folded into a “paper plane” without fracture and withstand a weight of 500 g (inset of Figure d), exhibiting sufficient flexibility and strength, which enable their potential applications in irregular-shaped electronic devices. The remarkable mechanical properties of ANF/PVA/BNNS-OH composite films could be attributed to their favorable interfacial interactions and well-arranged architecture .…”

Section: Resultsmentioning

confidence: 99%

“…When the temperature rises to 180 °C, the dielectric constant, tan δ, and AC conductivity at a low frequency (10 2 –10 3 Hz) increase significantly, while these values maintain stable at higher frequencies (10 4 –10 6 Hz), showing obvious hysteresis characteristics of the interfacial polarization with a high-frequency electric field. The typical interface polarization effect can be interpreted by the weakening van der Waals forces and the breaking interfacial hydrogen bonding at high temperatures, leading to a relatively reduced compatibility of the interface between BNNS-OH and ANF/PVA. Figure g presents the variation of the dielectric properties at 10 3 Hz as a function of temperature.…”

Section: Resultsmentioning

confidence: 99%

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Biomimetic Nacreous Composite Films toward Multipurpose Application Structured by Aramid Nanofibers and Edge-Hydroxylated Boron Nitride Nanosheets

Zhao

Wei

Ren

et al. 2022

Ind. Eng. Chem. Res.

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High-performance dielectric film is one of the most promising materials for comprehensive applications ranging from high-voltage electrical equipment to high-power electronic devices. We here report the fabrication of biomimetic nacreous multifunctional composite films by self-assembling nanoscale building blocks of one-dimensional (1D) aramid nanofibers (ANFs) and two-dimensional (2D) edge-hydroxylated boron nitride nanosheets (BNNS-OH). Synchronously, poly(vinyl alcohol) was introduced as soft glue to improve the interfacial interaction between ANFs and BNNS-OH by building a three-dimensional (3D) hydrogen-bond network. Attributing to the well-designed nanostructure and favorable interfacial hydrogen bonding, the resultant composite films exhibited a ultrastrong tensile strength (∼329.6 MPa), a high thermal conductivity (16.03 W m −1 K −1 ), outstanding dielectric properties, superior thermostability, and long life. Moreover, these synergistic properties of composite films were tunable by changing the contents of BNNS-OH to accommodate the requirements of multipurpose applications in the development of advanced insulation systems and thermal management materials.

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“…As one of the high performance fibers, aramid fiber, constructed by highly aligned molecular chains of poly (paraphenylene terephthalamide) (PPTA), is well known for its outstanding mechanical properties, high heat resistance, and excellent electrical insulation properties [14]. At present, aramid fibers and/or aramid pulp fibers are widely used to Polymers 2021, 13, 3093 2 of 11 make insulating papers, but their mechanical properties and dielectric strength are still inadequate due to the poor interfacial interactions between microscale aramid fibers [15,16]. It has been found that aramid fibers can be completely split into uniform high aspect ratio aramid nanofibers (ANFs) by controlled deprotonation [17].…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Dielectric Film with Superior Mechanical Properties and Ultrahigh Electric Breakdown Strength Made from Aramid Nanofibers and Alumina Nanoplates

Qing

Wei

et al. 2021

Polymers

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Materials with excellent thermal stability, mechanical, and insulating properties are highly desirable for electrical equipment with high voltage and high power. However, simultaneously integrating these performance portfolios into a single material remains a great challenge. Here, we describe a new strategy to prepare composite film by combining one-dimensional (1D) rigid aramid nanofiber (ANF) with 2D alumina (Al2O3) nanoplates using the carboxylated chitosan acting as hydrogen bonding donors as well as soft interlocking agent. A biomimetic nacreous ‘brick-and-mortar’ structure with a 3D hydrogen bonding network is constructed in the obtained ANF/chitosan/Al2O3 composite films, which provides the composite films with exceptional mechanical and dielectric properties. The ANF/chitosan/Al2O3 composite film exhibits an ultrahigh electric breakdown strength of 320.1 kV/mm at 15 wt % Al2O3 loading, which is 50.6% higher than that of the neat ANF film. Meanwhile, a large elongation at break of 17.22% is achieved for the composite film, integrated with high tensile strength (~233 MPa), low dielectric loss (<0.02), and remarkable thermal stability. These findings shed new light on the fabrication of multifunctional insulating materials and broaden their practical applications in the field of advanced electrics and electrical devices.

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Facial fabrication of aramid composite insulating paper with high strength and good thermal conductivity

Cited by 42 publications

References 37 publications

Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

Biomimetic Nacreous Composite Films toward Multipurpose Application Structured by Aramid Nanofibers and Edge-Hydroxylated Boron Nitride Nanosheets

Bioinspired Dielectric Film with Superior Mechanical Properties and Ultrahigh Electric Breakdown Strength Made from Aramid Nanofibers and Alumina Nanoplates

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