MATERIALS SCIENCE FORUM
·
2024
·
IF 0
Yue Xiang,Rong Jin Huang,Zheng Rong Zhou,Tao Wang,Li Shi,Wen Tao Sun,Lai Feng Li
In recent years, polymer/ceramic composites with high thermal conductivity have been widely used in microelectronic devices, superconducting magnets and aviation, and further improving their thermal conductivity is a great challenge. In this work, spherical alumina nanoparticles were modified with 3-aminopropyltriethoxy-silane (APTES) successfully. Furthermore, the modified Al2O3(M-Al2O3)/Epoxy(EP) and Graphene(Gr)/M-Al2O3/EP composites were prepared and their properties were tested in the temperature range of 70 K-300 K. The results showed that the thermal conductivity of the composite with 1 wt% Gr and 60 wt% M-Al2O3 hybrid filler is 15 times higher than that of pure epoxy at 70 K, which indicates its application prospect in thermal interface materials.
研究领域:
材料科学
·
热物理学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jingyi Chen,Ruyue Su,Xueqin Zhang,Ying Li,Rujie He
The high computility of electronic components put urgent requirements on the dissipation efficiency of a high thermal conductive substrate. Herein, inspired by the nature structure, leaf-vein-like Al2O3 skeleton was first designed though topology optimization algorithm and manufactured via vat photopolymerization (VPP) 3D printing, then compounded with epoxy (EP) to prepare leaf-vein-like biohybrid structures. The biohybrid structure had a high λ (14.65 Wm–1 K–1 with the solid fraction of 40 vol %), which was 5585% higher than neat EP and 269% higher than the random dispersed Al2O3/EP composite at the same solid amount. Moreover, it further showed a high enhancement in the cooling ecoefficiency of the lighting-emitting diode (LED) cooling system. Compared with 40 vol % random dispersed Al2O3/EP composite as a cooling substrate, the leaf-vein-like biohybrid structure with the same solid fraction reduced the working temperature of LED by 8.9 °C. Our strategy has a significant potential as a viable type and mass-producible bionic cooling substrate.
研究领域:
材料科学
·
热管理技术
·
生物启发设计
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 26
·13544-13556
·
IF 8.867
Yuezhan Feng,Ji Hu,Yang Xue,Chengen He,Xingping Zhou,Xiaolin Xie,Yunsheng Ye,Yiu-Wing Mai
Fire hazards related to polymer-based thermally conductive composites (PTCs) used in electronic equipment are a significant, but often neglected, risk. Here, we offer a solution by incorporating flame retardant-functionalized graphene (PFR-fRGO) into PTCs using a procedure that improves both their flame resistance and thermal conductivity. Briefly, PFR-fRGO was prepared by covalently grafting a polyphosphoramide oligomer (PDMPD) onto the surface of graphene, which was then introduced in situ into epoxy resin/Al2O3 (EP/Al2O3) composites. As expected, the incorporation of PFR-fRGO not only increased the thermal conduction paths by weakening the settlement of microparticles, but also reduced the interfacial thermal resistance by enhancing interfacial interactions, both of which resulted in an enhancement of the thermal conductivity of the ternary composites. The resultant EP/Al2O3/PFR-fRGO composite exhibited a superior flame retarding ability with dramatic decreases being seen in the high peak heat release rate (PHRR), the total heat release (THR) and the total smoke production (TSP), i.e. 53%, 37% and 57%, respectively, when compared to pure epoxy resin. Additionally, a synergistic flame retarding effect was found in the ternary composite compared to the EP/PFR-fRGO and EP/Al2O3 composites. The remarkable enhancement in flame retardancy was mainly attributed to the catalytic charring effect of PFR-fRGO and the template effect of Al2O3, both of which resulted in the formation of a high strength, thermally stable protective layer in the condensed phase that is able to retard the permeation of heat and volatile degradation products during combustion, slow down the heat release rate and protect the underlying polymer.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 15
·
IF 1.64
Wenman Guo,Guohua Chen
Ball milling is selected to prepare composites of graphene nanoplatelets (GNPs) and epoxy. Much enhanced thermal conductivity was recorded with higher GNP loading, which varied between 5 and 25 wt %. A maximum thermal conductivity of 2.67 W/m·K was found. The prepared composites were characterized by scanning electron microscopy, transmission electron microscopy, and Raman. It was found that KNG180, a commercially available kind of natural graphite, with a thickness of 30 ∼ 80 nm were mainly exfoliated into GNPs (<10 layers) with high quality, which were in turn uniformly dispersed in the composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40565.
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 51
·期 1
·232-242
·
IF 1.938
Mai Yuxiang,Du Bin,Liu Qian,Zhao Yushun,Yang Wei,Yan Bingyue
Abstract The interfacial structure between the inorganic filler and epoxy resin matrix in epoxy resin (EP) composites has a great influence on the mechanical properties, thermal conductivity, and electrical properties. In this paper, two micro@nanostructured Al 2 O 3 fillers and their epoxy resin composites were prepared, and their morphology, interfacial bond strength, mechanical properties, thermal conductivity, and electrical properties systematically tested and analyzed. The experimental results show that modification by a nano-Al 2 O 3 coating on the surface of micro-Al 2 O 3 can effectively improve the infiltration of Al 2 O 3 filler and epoxy resin, reduce the interfacial defects caused by weak bonding of Al 2 O 3 filler and epoxy resin, and thus synergistically improve the mechanical properties, thermal conductivity, and electrical properties of epoxy resin composites. The thermal conductivity was improved by 22.5% compared with 22.65% when using micro-Al 2 O 3 /EP, the tensile and flexural strength were improved by 36.67% and 20.82%, and the alternating-current breakdown strength was improved by 12.88%. In addition, thermally stimulated current experiments were carried out to study the electron transport properties of micro@nano-Al 2 O 3 epoxy resin composites, revealing that filler nanomodification could improve the trap depth, suppress the carrier transport, and improve the dielectric properties of the composites. Graphic Abstract
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Yan Lv,Juguo Dai,Long Xia,Lili Luo,Yiting Xu,Lizong Dai
To avoid potential ecological and health problems caused by phosphorus-based flame retardants, a novel phosphorus-free PBA-Salen-Ni flame retardant is successfully synthesized in this work. In a nutshell, boron-containing metal complexes are prepared by nickel salts and chelating PBA-Salen molecule (PBA: p -phenylenediboronic acid). While the obtained material inherently has good compatibility and can endow polymers with good flame retardant properties at low addition levels. Besides, the char shielding layer and the “labyrinth effect” of the special porous char layer structure formed after the combustion of EP/PBA-Salen-Ni retard the transfer of volatile products, giving EP excellent smoke suppression properties. The results show that the limiting oxygen index value of the EP/PBA-Salen-Ni composites is increased from 25.6% (pure EP) to 30.5%, and it can pass the UL-94 V-0 rating when the addition amount is only 5wt%. Particularly, compared with pure EP, the total smoke production (19.9 m 2 ) and peak heat release rate (859.6 kW m −2 ) of EP/PBA-Salen-Ni composites are reduced by 36% and 33%, respectively. Therefore, this work provides a new idea for the rational design of phosphorus-free flame retardants that are mainly on condensed phase flame retardancy and have a good smoke suppression effect.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 15
·2243
·
IF 5.3
Ruicong Lv,Haichang Guo,Lei Kang,Akbar Bashir,Liucheng Ren,Hongyu Niu,Shulin Bai
With the rapid development of the electronics industry, there is a growing demand for packaging materials that possess both high thermal conductivity (TC) and low electrical conductivity (EC). However, traditional insulating fillers such as boron nitride, aluminum nitride, and alumina (Al2O3) have relatively low intrinsic TC. When graphene, which exhibits both superhigh TC and EC, is used as a filler to fill epoxy resin, the TC of blends can be much higher than that of blends containing more traditional fillers. However, the high EC of graphene limits its application in cases where electrical insulation is required. To address this challenge, a method for coating graphene sheets with an in situ grown Al2O3layer has been proposed for the fabrication of epoxy-based composites with both high TC and low EC. In the presence of a cationic surfactant, a dense Al2O3layer with a network structure can be formed on the surface of graphene sheets. When the total content of Al2O3and graphene mixed filler reached 30 wt%, the TC of the epoxy composite reached 0.97 W m−1K−1, while the EC remained above 1011Ω·cm. Finite element simulations accurately predicted TC and EC values in accordance with experimental results. This material, with its combination of high TC and good insulation properties, exhibits excellent potential for microelectronic packaging applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER SCIENCE SERIES B
·
2023
·
IF 1.2
Lin Liu,Xu Xin,Wu Jing,Zhang Lin,Li Jialiang,Zeng Xiaoyu
Abstract Inspired by mussel heuristic chemistry, a novel method for improving surface wettability and adhesion of carbon fibers with epoxy resins was proposed by codepositing gallic acid and polyethylene imine on the carbon fiber surfaces in a convenient operation. The results of scanning electron microscopy, infrared, Raman and X-ray photoelectron spectra revealed that gallic acid and polyethylene imine could undergo Michael addition or Schiff base reaction and codeposit on the carbon fiber surfaces successfully. The gallic acid-polyethylene imine codeposited carbon fibers were used to fabricate epoxy matrix composites. The results of mechanical tests showed that interlaminar shear strength, flexural modulus and strength of the gallic acid-polyethylene imine codeposited carbon fiber composite were increased by 27, 38, and 27% respectively, compared with those of the untreated carbon fiber composite. The conclusion can be drawn that the gallic acid-polyethylene imine codeposition is an effective method for improving interfacial properties of carbon fiber reinforced epoxy resin matrix composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 23
·21325-21334
·
IF 2.22
Liu Houbao,Fu Renli,Su Xinqing,Wang He,Wu Binyong,He Qinjiang
With the development of electronic components towards high power, high packaging density, and miniaturization of device size, heat dissipation and the electromagnetic interference problems between the electronic components are emerging. In order to solve the undesirable electromagnetic wave and heat emissions produced by electronic device simultaneously, the electronic packaging materials with high thermal conductivity and anti-electromagnetic interference are highly expected. In this work, NiFe 2 O 4 -modified short carbon fibers (SCF) were designed and prepared. NiFe 2 O 4 were in situ grown on the surface of SCF by hydrothermal method. The chemical structure and morphology of SCF-NiFe 2 O 4 were characterized by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The microwave absorbing performance test shows that SCF-NiFe 2 O 4 possess superior microwave absorbing performance, where the minimum reflection loss is − 20.7 dB. Finally, SCF-NiFe 2 O 4 /epoxy resin composites were prepared by introducing SCF-NiFe 2 O 4 as thermal conductive filler into epoxy resin. The surface-modified SCF with NiFe 2 O 4 is more easily infiltrated by resin and exhibits strong interfacial interaction with the matrix. With the increase of the content of SCF-NiFe 2 O 4 , the thermal conductivity of the composites increases obviously. When the content of SCF-NiFe 2 O 4 reaches 20 vol%, the composites show better thermal conductivity, and the thermal conductivity reaches 1.03 W/m K.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Yuwei Wang,Baoli Ou,Ping Zhu,Bo Niu,Yan Guo,Qian Zhi
By combining organic materials with metal materials, it is easy to obtain new composite materials with excellent properties. Here, an excellent performance aluminum foam epoxy resin composite material (AFE) was prepared by heat-assisted vacuum infusion technology. Owing to the unique foam structure of aluminum foam (AF) and excellent physical and chemical properties of modified epoxy resin, the AFE with an interpenetrating network structure shows excellent wear resistance, bending resistance and corrosion resistance . The SEM images show that the filling efficiency of epoxy resin to AF is over 99%, and the epoxy resin was tightly combined with the metal foam . The surface and mechanical properties test results show that AFE has excellent mechanical properties and high wear resistance, the maximum bending σ b and tensile strength σ t can reach 74.33 MPa and 42.09 MPa, respectively, and the minimum wear rate Ws is 8.231 × 10 −4 mm 3 /Nm. Tafel polarization curve and electrochemical impedance spectroscopy (EIS) results show that the AFE has excellent corrosion resistance , with corrosion current i corr as low as 1.399 × 10 −9 A•cm −2 and Z 0. 01 Hz as high as 7.74 × 10 7 Ω•cm 2 after superhydrophobic treatment process.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Si-Wei Xiong,Pan Zhang,Qian Zou,Yu Xia,Meng-ying Jiang,Jing-Gang Gai
The formation of a continuous network for thermal transport is crucial for obtaining materials with high thermal conductivity . Herein, we report a novel epoxy-based composite with unique independent structures of liquid alloy (LQA) droplets and high thermal conductivity ceramic fillers . The ceramic fillers only aggregated in the spaces between the LQA droplets due to the low compatibility of the ceramic fillers and the LQA droplets, so that the LQA droplets and the ceramic fillers eventually form independent structures. This creates a continuous network in epoxy that is advantageous for thermal transport. Thermal conductivity measurements showed that the thermal conductivity of the Epoxy/LQA/ceramic composites can reach 2.46 W m −1 K −1 , for an enhancement of 1055.87% relative to pure epoxy. More importantly, the independent structures endowed the composites with excellent electrical safety. The electrical resistivity of the Epoxy/LQA composites was 8.53 × 10 7 Ω cm, while the electrical resistivities of the three Epoxy/LQA/ceramic composites were 3.11 × 10 11 Ω cm (Epoxy/LQA/Al 2 O 3 ), 2.41 × 10 11 Ω cm (Epoxy/LQA/Si 3 N 4 ), 4.45 × 10 11 Ω cm (Epoxy/LQA/h-BN), respectively. This work provides a new perspective on both the fundamental science and practical applications of thermal transport in polymer composites .
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Xiao-Hui Shi,Li Chen,Qing Zhao,Jia-Wei Long,Ying-Ming Li,Yu-Zhong Wang
Construction of carbon fiber (CF)-reinforced epoxy resin (EP) composites with excellent mechanical properties and desired flame retardancy is of particular interests for both academia and industry. In this work, an interfacial treatment strategy is used to address the above issues instead of adding flame retardants into the composites: without additional other flame retardants, EP is fire-retarded and reinforced only by surficially-treated CFs, which are fabricated by quickly soaking CFs in aqueous solution of polyelectrolyte complexes (PEC) consisting of polyethyleneimine (PEI) and ammonium polyphosphate (APP) at room temperature. Both the content and the morphology of the resulting PEC coating are conveniently tuned by adjusting the coating conditions. Without any change in the molding process of the EP/CF composites compared with the conventional process, the phosphorus-containing PEC coating of CF surfaces endows the EP/CF composites with high fire retardancy, exhibiting a high limiting oxygen index of 43%, UL-94 V-0 rating, and a 47% reduction in the peak heat release rate (PHRR) from cone calorimetry tests. Moreover, the PEC coating greatly improved the interaction between CFs and EP matrix, and enhanced the mechanical properties and glass transition temperature of the composite. Therefore, this work presents an effective and facile strategy to develop fiber-reinforced composites with superior fire-retardant and mechanical properties for future massive production.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）