Highly thermally conductive flame retardant epoxy nanocomposites with multifunctional ionic liquid flame retardant-functionalized boron nitride nanosheets

Li, Xiongwei; Feng, Yuezhan; Chen, Chao; Zeng, Hongxia; Qu, Hao; Liu, Jingwei; Zhou, Xingping; Long, Shijun; Xie, Xiaolin

doi:10.1039/c8ta08008a

Cited by 132 publications

(51 citation statements)

References 66 publications

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“…It is crucial for the devices that the produced heat can be effectively dissipated. However, EP thermosets exhibit low intrinsic thermal conductivity of 0.1 to 0.4 Wm −1 K −1 . Besides, the fire risk is a significant drawback of the EP thermosets.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the construction of core‐shell‐brush and the dispersion of thermal conductive nanofillers in the interval of polymer brush will be a promising approach to simultaneously improve the thermal conductivity and flame retardancy of EP thermosets. Xie et al prepared flame retardant‐functionalized boron nitride nanosheets and used to preparing the thermal conductive and flame retardant EP thermosets. However, the flame retardant performance of thermosets was not satisfied.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Leng

Sun

et al. 2019

Polymers for Advanced Techs

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Fire safety and thermal dissipation performance of epoxy resins thermosets were critical for its application in key fields such as electronic devices. The simultaneous improvement of flame retardant and thermal conductivity properties were still a challenge. Herein, ammonium polyphosphate (APP) was firstly encapsulated with 5-wt% epoxy resins based on APP and then surface grafted with polyurethane polymer chain, and the resulting APP with core-shell-brush structure was constructed. Finally, the multiwalled carbon nanotube (MWCNT) was assembled in the intervals of polymer brush on APP surface, and the prepared filler was defined as MF-APP. Its chemical structure and morphologies were characterized and confirmed. The wettability of MF-APP was evaluated by water contact angles tests (WCA) and MF-APP exhibited hydrophobic property with the WCA of 138°. When 9-wt% MF-APP was incorporated into EP thermosets, the thermal conductive value of EP/MF-APP achieved 1.02 Wm −1 K −1 , and the MWCNTs concentration was only 1.8 wt% in thermosets.Compared with the previous work, the prepared EP/MF-APP thermosets exhibited outstanding thermal conductive efficiency because of the homogeneously distribution of MWCNTs. Moreover, the samples fulfilled UL-94 V-0 grade during vertical burning tests with the limiting oxygen index of 30.8%. As a result, the thermal conductivity and flame retardancy of EP thermosets were simultaneously enhanced with a relatively low addition amount of MF-APP, which would bring more chance for wider application of EP thermosets in key fields. KEYWORDS core-shell-brush structure, epoxy resin, flame retardancy, thermal conductivity 1 | INTRODUCTION Epoxy resin (EP) has been widely used in electronic and electrical industries, especially in printed circuit board (PCB) because of its exciting properties such as corrosion resistance, electrical insulation, and high strength. 1-3 With the development of electronic devices toward miniaturization and integration, a large number of heat fluxes in electronic equipment are generated during operation process. It is crucial for the devices that the produced heat can be effectively dissipated. However, EP thermosets exhibit low intrinsic thermal conductivity of 0.1 to 0.4 Wm −1 K −1 . 4-6 Besides, the fire risk is a significant drawback of the EP thermosets. Considering the public safety and the requirement of electronic devices, the simultaneous improvement of thermal conductivity and flame retardancy for the EPs thermosets is becoming an urgent problem and has attracted a lot of attention over the years.To enhance the thermal conductivity, the traditional highly thermally conductive fillers (~5000 Wm −1 K −1 ) such as aluminum oxide, 7,8 whiskers, 9 nanosilica, 10 and aluminum nitride 11 are generally incorporated into the polymeric material. However, the high loading amount (about 30%-60% by volume) is required to fulfill the thermal conductivity (>1 Wm −1 K −1 ). Besides, the high addition amount of filler would deteriorate the processing and the mechanical properties...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Leng

Sun

et al. 2019

Polymers for Advanced Techs

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show abstract

“…As a structural analogue of graphene, monolayer 2D hexagonal boron nitride (h-BN), with the alternate use of boron and nitrogen atoms instead of carbon atoms in the 2D conjugate layers, has attracted increased attention due to its high-temperature stability, excellent thermal conductivity, superior chemical inertness, and low friction coefficients [16,118]. Considering the ionic properties of the B-N bond in the boron nitride layer, which is different from the covalent C-C bond of graphene, boron nitride nanosheets have outstanding resistance to oxidation (the degradation temperature in air is 840°C) and corrosion [119].…”

Section: Nitrogen-containing Compoundsmentioning

confidence: 99%

“…With the rapid development of electronic devices, there is an increasing demand for high heat-dissipation polymers [13,118,126,129]. We found that a high thermal conductivity (TC) is also an important factor for the high flame retardancy dehydrogenation of a polymer occurs and these unsaturated sites then lead to crosslinking and ultimately graphitization.…”

Section: Nitrogen-containing Compoundsmentioning

confidence: 99%

“…BP can catalyze the formation of char and capture free radicals, and its unique layered structure can also serve as a physical barrier for insulation from heat and oxygen during the combustion process [115]. fabricating EP-based nanocomposites with both superior TC and ame retardancy [118]. ese ILFR-fBNNS trigger resin crosslinking at a given temperature, while conferring of boron nitride nanosheets.…”

Section: Black Phosphorus and Dehydrated Vanadylmentioning

confidence: 99%

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Nanoreinforcements of Two-Dimensional Nanomaterials for Flame Retardant Polymeric Composites: An Overview

Hong

Chen

2019

Advances in Polymer Technology

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Polymer materials are ubiquitous in daily life. While polymers are often convenient and helpful, their properties often obscure the fire hazards they may pose. Therefore, it is of great significance in terms of safety to study the flame retardant properties of polymers while still maintaining their optimal performance. Current literature shows that although traditional flame retardants can satisfy the requirements of polymer flame retardancy, due to increases in product requirements in industry, including requirements for durability, mechanical properties, and environmental friendliness, it is imperative to develop a new generation of flame retardants. In recent years, the preparation of modified two-dimensional nanomaterials as flame retardants has attracted wide attention in the field. Due to their unique layered structures, two-dimensional nanomaterials can generally improve the mechanical properties of polymers via uniform dispersion, and they can form effective physical barriers in a matrix to improve the thermal stability of polymers. For polymer applications in specialized fields, different two-dimensional nanomaterials have potential conductivity, high thermal conductivity, catalytic activity, and antiultraviolet abilities, which can meet the flame retardant requirements of polymers and allow their use in specific applications. In this review, the current research status of two-dimensional nanomaterials as flame retardants is discussed, as well as a mechanism of how they can be applied for reducing the flammability of polymers.

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A Roadmap Review of Thermally Conductive Polymer Composites: Critical Factors, Progress, and Prospects

Wang

Weng

et al. 2023

Adv Funct Materials

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Recently, the need for miniaturization and high integration have steered a strong technical wave in developing (micro‐)electronic devices. However, excessive amounts of heat may be generated during operation/charging, severely affecting device performance and leading to life/property loss. Benefiting from their low density, easy processing and low manufacturing cost, thermally conductive polymer composites have become a research hotspot to mitigate the disadvantage of excessive heat, with potential applications in 5G communication, electronic packaging and energy transmission. By far, the reported thermal conductivity coefficient (λ) of thermally conductive polymer composite is far from expectation. Deeper understanding of heat transfer mechanism is desired for developing next generation thermally conductive composites. This review holistically scopes current advances in this field, while giving special attention to critical factors that affect thermal conductivity in polymer composites as well as the thermal conduction mechanisms on how to enhance the λ value. This review covers critical factors such as interfacial thermal resistance, chain structure of polymer, intrinsic λ value of different thermally conductive fillers, orientation/configuration of nanoparticles, 3D interconnected networks, processing technology, etc. The applications of thermally conductive polymer composites in electronic devices are summarized. The existing problems are also discussed, new challenges and opportunities are prospected.

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Highly thermally conductive flame retardant epoxy nanocomposites with multifunctional ionic liquid flame retardant-functionalized boron nitride nanosheets

Abstract: Multifunctionality of ILFR-fBNNS, i.e. curing, thermal conduction and flame retardation.

Cited by 132 publications

References 66 publications

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Simultaneously improving the thermal conductive and flame retardant performance for epoxy resins thermosets by constructing core‐shell‐brush structure and distributing of MWCNTs in brush intervals

Nanoreinforcements of Two-Dimensional Nanomaterials for Flame Retardant Polymeric Composites: An Overview

A Roadmap Review of Thermally Conductive Polymer Composites: Critical Factors, Progress, and Prospects

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