Improvement of “point‐plane”‐like hetero‐structured fillers on thermal conductivity of poly(vinyl alcohol) composites

Zhang, Haoran; Xu, Shuyan

doi:10.1002/pc.27391

Cited by 6 publications

(2 citation statements)

References 66 publications

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“…The combustion of the remaining carbonaceous material in the film at 385−485 °C results in further weight loss. 31 Comparing with the pure PVA film, it is evident that the thermal stability of the p-BNNSs@PVA film is significantly improved. As the amount of p-BNNSs increases, the thermal stability of the p-BNNSs@PVA film also improves.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The mass loss below 150 °C mainly originates from the water adsorbed in the film, while the mass loss between 260 and 385 °C is due to the breakage of PVA chains and pyrolysis of functional groups. The combustion of the remaining carbonaceous material in the film at 385–485 °C results in further weight loss . Comparing with the pure PVA film, it is evident that the thermal stability of the p-BNNSs@PVA film is significantly improved.…”

Section: Results and Discussionmentioning

confidence: 99%

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Efficient Preparation of Hydrophilic Boron Nitride Nanosheets for Human Heat Dissipation Applications

Chen,

Yu,

Jia

et al. 2024

ACS Appl. Nano Mater.

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Hexagonal boron nitride (h-BN) is commonly used as a polymer filler to produce wearables with outstanding heat dissipation properties and excellent biocompatibility. However, the poor interfacial compatibility of h-BN in polymers, resulting from the chemical inertness of boron nitride and the low stripping efficiency of h-BN, limits its performance in thermal conductivity (TC) applications. To address these issues, we innovatively introduced a solid-phase molten salt method combined with a hydrothermal exfoliation strategy in this work to obtain poly(Nvinyl-2-pyrrolidone) stabilized hydrophilic boron nitride nanosheets (p-BNNSs). Notably, the method is simple and efficient, and the prepared p-BNNSs have fewer layers and higher hydrophilicity. The TC of the 30 wt % p-BNNSs@PVA films reached 7.38 W m −1 K −1 , representing a 3244% enhancement compared to pure PVA films. The nanofiber film was fabricated using electrospinning with the optimal filling ratio, successfully facilitating heat conduction on human skin. Finally, it is proposed that the use of nanofiber films as advanced medical films offers a practical solution to the negative impact of hot weather on wound healing.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Efficient Preparation of Hydrophilic Boron Nitride Nanosheets for Human Heat Dissipation Applications

Chen,

Yu,

Jia

et al. 2024

ACS Appl. Nano Mater.

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Asymmetric Structural MXene/PBO Aerogels for High‐Performance Electromagnetic Interference Shielding with Ultra‐Low Reflection

Liu,

Qiu,

et al. 2024

Advanced Materials

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Electromagnetic interference (EMI) shielding materials with low electromagnetic (EM) waves reflection characteristics are ideal materials for blocking EM radiation and pollution. Materials with low reflectivity must be constructed using materials with excellent EM waves absorption properties. However, materials simultaneously possessing both low reflectivity and excellent EMI shielding performance remain scarce, consequently, multilayer structures need to be developed. Poly(p‐phenylene–2,6–benzobisoxazole) nanofibers (PNF) are prepared by deprotonation. PNF are combined with MXene and heterostructure MXene@Ni prepared by in‐situ growth; MXene@Ni/PNF acts as an EM absorption layer while MXene/PNF acts as an EM reflective layer. Finally, (MXene@Ni/PNF)–(MXene/PNF) aerogels are prepared by layer‐by‐layer freeze‐drying based on the layered modular design concept. Experimental characterizations revealed that (MXene@Ni/PNF)–(MXene/PNF) aerogels enable the efficient absorption‐reflection‐reabsorption of EM waves, effectively eliminating EMI. When the mass ratio of MXene to Ni in MXene@Ni is 1:6 and the mass fraction of MXene in the reflective layer is 80 wt.%, the (MXene@Ni/PNF)–(MXene/PNF) aerogels exhibit excellent EMI shielding performance (71 dB) and a very low reflection coefficient (R = 0.10). Finite element simulations verified that the developed asymmetric structural aerogels achieve high EMI shielding performance with low reflection characteristics. In addition, (MXene@Ni/PNF)–(MXene/PNF) aerogels display excellent infrared camouflage ability.

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Preparation and thermal conductivity of bimodal diamond particles reinforced phenolic resin composites

Xie,

Gao,

et al. 2024

Polymer Composites

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Thermal conductive polymer composites have broad application prospects in the field of thermal management. However, due to intrinsically low thermal conductivity of polymers, even if fillers with high mass fraction are filled, the thermal conductivity of polymer composites cannot be significantly improved. In this paper, bimodal diamond particles (70 wt.% 150 μm and 22 wt.% 25 μm) were incorporated into phenolic resin to construct continuous heat transfer pathways by close packing, thereby enhancing its thermal conductivity. The results indicated that diamond particles with smaller particle size can effectively bridge the gaps between larger ones, forming a continuous for heat conduction. As a result, a maximum thermal conductivity value of 12.45 W/(m·K) can be achieved, which is 65.5 times, 9.8 times and 8.4 times higher than pure phenolic resin, 25 μm diamond particles reinforced phenolic resin composite and 150 μm diamond particles reinforced phenolic resin composite, respectively. Furthermore, heat dissipation and water cooling experiments also confirm the superior heat dissipation performance of phenolic resin composites reinforced with bimodal diamond particles. When the heating voltage is 10 V and the water cooling rate is 30 mL/min, the upper surface temperature of bimodal diamond composites is 129.2°C lower than that of pure phenolic resin. This investigation provides a new type of polymer composite with high thermal conductivity, which has promising prospects for application in thermal management. It also provides new insights for preparing polymer composites with high thermal conductivity by close packing of bimodal particles.Highlights Surface modification of the filler enhances its combination with resin. The interfacial bonding will be enhanced by D–OH bond on diamond surface. Bimodal diamond particles lead to the formation of a closely packed structure. This special structure can form a three‐dimensional heat conduction network. The highest TC of the DD/PR composite is 12.45 W/(m·K).

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Improvement of “point‐plane”‐like hetero‐structured fillers on thermal conductivity of poly(vinyl alcohol) composites

Cited by 6 publications

References 66 publications

Efficient Preparation of Hydrophilic Boron Nitride Nanosheets for Human Heat Dissipation Applications

Efficient Preparation of Hydrophilic Boron Nitride Nanosheets for Human Heat Dissipation Applications

Asymmetric Structural MXene/PBO Aerogels for High‐Performance Electromagnetic Interference Shielding with Ultra‐Low Reflection

Preparation and thermal conductivity of bimodal diamond particles reinforced phenolic resin composites

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