HIGH PERFORMANCE POLYMERS
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2017
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IF 1.179
Jun Song,Zhendong Dai,Jingyu Li,Haichao Zhao,Liping Wang
Boron nitride-hydroxyl (BN–OH) was synthesized with silane coupling agent (KH550) in order to achieve epoxy/BN nanocomposites with excellent thermal, tribological, and mechanical properties. This is an efficient method to improve epoxy nanocomposite properties. These properties were investigated by friction and wear test, thermogravimetric analysis, and dynamic mechanical analysis. The wear mechanisms were studied by scanning electron microscopy. Surface modification of BN–OH with silane coupling agent significantly enhanced its thermal stability. Storage modulus of the nanocomposite with 2% epoxy/BN increased by nearly 300% in comparison with that of pure epoxy. The results exhibit outstanding performance of the epoxy/BN nanocomposites compared with pure epoxy resin.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
TRIBOLOGY INTERNATIONAL
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2026
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IF 7.6
Jiajia Cen,Shuangqi Li,Kai Chen,Dekun Zhang
Polyetheretherketone (PEEK) possesses excellent corrosion resistance, moderate friction properties, and high‑temperature stability. However, under severe operating conditions, its coefficient of friction (COF) and wear rate increase significantly, limiting broader application. In this work, P‑MoS₂ was synthesized in situ on a PEEK matrix using a hydrothermal method, while K‑BN‑OH was prepared via surface grafting with a coupling agent. Both fillers were then blended with a PEEK/PTFE matrix to produce a novel PEEK/PTFE/P‑MoS₂/K‑BN‑OH composite. Orthogonal experiments identified the optimal composition of PEEK/PTFE/P‑MoS₂, which exhibited the best overall performance. The effect of K‑BN‑OH content on the mechanical, thermal, and tribological properties of the composites was systematically studied. Tribological behavior under varying conditions was analyzed to elucidate wear mechanisms and filler synergy. Results show that the composite with 25% PTFE and 5% P‑MoS₂ achieved the most balanced performance: elastic modulus (1414.62 MPa), compressive strength (127.81 MPa), COF (0.108), and wear rate (1.81 ×10⁻⁶ mm³/N·h) decreased by 22.58%, 35.82%, 73.13%, and 59.78%, respectively, compared to pure PEEK, while creep strain (2.77%) increased by 95.62%. Further addition of 3% K‑BN‑OH enhanced mechanical and thermal properties: elastic modulus rose to 1520.13 MPa, compressive strength to 131.33 MPa, creep strain fell to 1.82%, and thermal conductivity reached 0.294 W/m·K. The average coefficient of friction(ACOF) declined to 0.094, though wear rate rose slightly to 2.26 × 10⁻⁶ mm³/N·h. Tribological tests revealed that wear rate increased with rotational speed, while ACOF showed a non‑monotonic trend, first decreasing and then increasing. With increasing load, both ACOF and wear rate initially decreased before rising, reaching minima at 20 N (0.077 and 2.09 ×10⁻⁶ mm³/N·h, respectively). Molecular dynamics simulations elucidated that PTFE formed a lubricating film through interfacial enrichment, while MoS₂ enhanced matrix ordering and promoted interfacial slip via π-π stacking and C-S bonding. In contrast, h-BN disrupted the synergistic lubrication network established between PTFE and MoS₂ due to its spatial blocking effect. This work systematically elucidates the synergistic mechanisms of fillers from the microscopic level to macroscopic performance, providing a theoretical basis for the design of high‑performance PEEK composites tailored to specific operating conditions.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yufeng Bai,Huizhi Yang,Lili He,Chunhua Ge,Renchang Zhai,Xiangdong Zhang
As electronic device integration and power density increase, materials must have brilliant microwave absorption properties and thermal conductivity to solve electromagnetic wave pollution and thermal management problems. In this work, we attempt to construct core-shell hydroxylated boron nitride nanosheets (BN-OH) @Fe 3 O 4 @PAn (BFeA) nanocomposites by chemical synthesis and in-situ growth design. The excellent magnetic properties of Fe 3 O 4 and the good electrical conductivity of PAn can form magnetic loss and electrical loss centers to play a synergistic effect in improving microwave absorption capacity. Meanwhile, with the wave-transmitting material BN-OH as the core, the electromagnetic waves can be reflected multiple times within the absorber, which further enhances the microwave absorption capability of BFeA. As a result, the minimum reflection loss (RL min ) of the composites can reach − 49.85 dB at 11.36 GHz, and the effective microwave absorption bandwidth (RL<−10 dB, EAB) is close to 8 GHz (8.5–16.5 GHz) at a thickness of 3 mm. Simultaneously, to improve the thermal conductivity (TC) of the BFeA and reduce the interfacial thermal resistance, we use hydroxyl and dopamine as the interface linking agent at the interfaces of BN-OH and Fe 3 O 4 , and Fe 3 O 4 and PAn, respectively. In this case, the TC of BFeA-2 reaches 0.98 W (m K) −1 at a total BN–OH content of only 13 wt. %, nearly 4 times that of the raw material (Fe 3 O 4 ). This work can provide a reference for developing materials with dual functions of thermal management and microwave absorption.
研究领域:
材料科学
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电磁学
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热传导
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DOI
高影响因子
MATERIALS & DESIGN
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2023
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IF 8.4
Wenbin Shi,Nijia Song,Yanping Huang,Wenjie Wang,Chao He,Weifeng Zhao,Changsheng Zhao
Hydrogel treatment as a common cooling method could effectively ease pain and promote wounds healing by reducing thermal injury to the skin. However, the inherent low thermal conductivity of polymers limits the improvement of hydrogels’ cooling performance. The present study reports a simple method by combining thermal conductive fillers 1D hydroxylated multiwall carbon nanotubes (CNT-OH) and 2D hydroxylated hexagonal boron nitride (BN-OH) to construct 3D conductive networks in hydrogels for cooling treatment and burn therapy. It is interesting that the thermal conductive fillers are aligned via varying the mass ratios of CNT-OH to BN-OH. Hence, the utilization efficiency of the thermal conductive fillers is improved; and the thermal conductivity of the hydrogels is enhanced up to 1.31 W*m −1 *K −1 , which is 226 % to the pristine hydrogel of 0.58 W*m −1 *K −1 . Consequently, the optimized hydrogel exhibits rapid cooling abilities that the heated porcine skin only takes 168 s to decrease 30 °C with the treatment of the hydrogel. More importantly, the thermal conductivity enhanced hydrogel exhibits the capacities of rapid cooling, reducing heat injury and pain relieving, and promoting wound healing in vivo tests, which prove that the enhanced thermal conductive and moisturizing hydrogel can be a good alternative for burn therapy.
研究领域:
材料科学
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医学
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生物工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2019
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IF 3.45
Weifang Han,Mengyuan Chen,Wei Song,Chunhua Ge,Xiangdong Zhang
Hexagonal boron nitride (BN) hold great promise as emerging building blocks for thermal interface materials owing to their outstanding heat transfer performance. Herein, we report a carboxylated polystyrene-coated hydroxylated BN (BN–OH@PS-COOH) nanocomposite with highly thermal conductivity (TC) and extraordinary mechanical properties for thermal management. The exfoliated BN-OH nanosheets were obtained via molten alkali hydroxide pretreatment and sonication. Subsequently, PS-COOH nanospheres were grew on the surface of BN-OH nanosheets by in situ polymerization. Noncovalent interactions between PS-COOH and BN-OH are favor to reduce interfacial thermal resistance, which contributes to accelerate heat transport . As a result, the TC of the resultant BN-OH@PS-COOH nanocomposite with 12 wt% BN-OH addition is 1.131 W/mK, which is much higher than that of neat PS (0.186 W/mK) and BN/PS blend nanocomposite (0.312 W/mK). Moreover, the BN-OH@PS-COOH nanocomposite exhibits outstanding mechanical properties. Our study may stimulate novel perspectives on the design of high-performance polymer-based thermal interface materials.
研究领域:
材料科学
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热工程
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高分子科学
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纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）