MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 12
·2200494
·
IF 4.402
Shuoqi Wu,Pan Xu,Shan Wang,Desheng Qi,Le Wang,Lingcheng Meng,Shuyuan Ge,Xigui Yue
The preparation of the electromagnetic wave (EMW) absorbing materials with 3D porous structural, light weight, and high mechanical strength has been receiving greater attention for a long time. A series of light-weight polyetheretherketone/graphite/FeCo ternary heterogeneous composite foams (PEEK/C/FeCo) with high mechanical strength are prepared via thermally induced phase separation. Based on the high compressive strength of PEEK resin and its stable skeleton formed by thermally induced phase separation, the composite foam has high compressive strength and low density. In addition, during the thermally induced phase separation process, porous structures are formed inside the PEEK, and graphite and FeCo particles are uniformly dispersed between the pore structures, the composite foams possess excellent porous structure, moderate dielectric loss, and magnetic loss, exhibiting good absorbing properties. With the low density of 0.49 g cm −3 and high compressive strength of 6.40 MPa, the as-synthesized optimal sample (PEEK-50/C-40/FeCo-10) achieves a minimum reflection loss up to −35.9 dB covering a bandwidth of 3.6 GHz for a thickness of 1.5 mm. In a word, this study provides a novel, economical, and efficient way to obtain a light foam with high mechanical strength and good EMW absorbing property.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 10
·1111
·
IF 2.935
Peng Lu,Mengya Guo,Yang Yang,Min Wu
Emulsion templating has emerged as an effective approach to prepare polymer-based foams. This study reports a thermosetting nanocomposite foam prepared by nanocellulose stabilized Pickering emulsion templating. The Pickering emulsion used as templates for the polymeric foams production was obtained by mechanically mixing cellulose nanocrystals (CNCs) water suspensions with the selected oil mixtures comprised of acrylated epoxidized soybean oil (AESO), 3-aminopropyltriethoxysilane (APTS), and benzoyl peroxide (BPO). The effects of the oil to water weight ratio (1:1 to 1:3) and the concentration of CNCs (1.0–3.0 wt %) on the stability of the emulsion were studied. Emulsions were characterized according to the emulsion stability index, droplet size, and droplet distribution. The emulsion prepared under the condition of oil to water ratio 1:1 and concentration of CNCs at 2.0 wt % showed good stability during the two-week storage period. Nanocomposite foams were formed by heating the Pickering emulsion at 90 °C for 60 min. Scanning electron microscopy (SEM) images show that the foam has a microporous structure with a non-uniform cell size that varied from 0.3 to 380 μm. The CNCs stabilized Pickering emulsion provides a versatile approach to prepare innovative functional bio-based materials.Keywords:cellulose nanocrystals;AESO;Pickering emulsion;nanocomposite foam
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Jiang Shanshan,Yu Zhijun,Zhu Haixin,Huang Yuewen,Wang Bin
Noise has become a major potential problem in modern society, with a profound impact on human health. There is an urgent need to develop more effective sound-absorbing materials to control noise. In this study, composite foams were prepared by the sacrificial template method combined with non-solvent-induced phase separation using polyvinylidene fluoride (PVDF) as matrix and diatomaceous earth (DE) as filler. The result shows the addition of DE can act as a crystallization site to induce the formation of β phase in the PVDF matrix, thus enhancing the piezoelectricity of the foam. Due to the local piezoelectric effect of PVDF promoted by DE and the high porosity of DE itself, the sound absorption performance of DE/PVDF composite foam was better than that of pure PVDF foam. When the DE was 5 wt%, the noise reduction coefficient of DE/PVDF-2 composite foam was 50% higher than that of pure PVDF foam, and the average sound absorption coefficient (500–6400 Hz) was 38.5% higher. This work successfully prepared a moistureproof, flame-retardant, compression-resistant, and lightweight PVDF composite sound-absorbing foam, which is expected to be a commercial sound-absorbing material. Graphical abstract
研究领域:
材料科学
·
声学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Cuiqing Zhou,Long Ni,Junyu Lu,Haichao Meng,Yinfu Luo,Mei Liang,Huawei Zou
The development of efficient and multifunctional broadband microwave absorption (MA) materials is critical for military applications to cope with complex environments. Herein, polyimide (PI)/carbon nanotube (CNT) composite foams (PCCFs) were successfully fabricated by assembling CNT with PI via the microsphere foaming method, where gradient CNT allowed tunable electromagnetic parameters. Benefiting from the improved the impedance matching characteristics and microwave dissipation, PCCFs displayed a remarkable reflection loss value of −53.5 dB and an EAB that could be extended up to 13.5 GHz through thickness variation, encompassing almost all C, X and Ku bands. Furthermore, the composite foams exhibited outstanding mechanical property with a specific compressive strength up to 6.8 MPa/(g/cm 3 ), as well as low thermal conductivity (0.106 W/(m·K)) and excellent heat resistance, which are important references for the development of high-performance MA structural components for applications in extreme environments.
研究领域:
材料科学
·
电磁学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2021
·Vol. 24
·期 3
·2100940
·
IF 3.862
Liubo Liang,Botao Jiang,Tonghua Wu,Youmei Ma,Shuling Zhang,Guibin Wang
Glass fiber/poly(ether ether ketone) (GF/PEEK) composite foams with improved compressive strength and heat resistance can be successfully prepared using a simple and environmentally friendly supercritical carbon dioxide (sc-CO 2 ) foaming technology. The cell morphologies of the foams can be controlled by adjusting the GF content and foaming parameters, including the saturation temperature, saturation time, saturation pressure, and depressurization rate. With a foam density of 0.55 g cm −3 , the PEEK-based composite foam having 30% GF content has a 10% compressive strength of 11.07 MPa, and its density varies negligibly up to 330.0 °C. The GF/PEEK composite foams having high GF contents show significantly better properties than those having low GF contents as a result of the supporting and strengthening effect of the GF in the PEEK cell walls. The GF/PEEK composite foams also show good corrosion resistance. As a result of these properties, the GF/PEEK composite foams are promising high-performance materials for use in extreme environments.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Hongming Zhang,Guangcheng Zhang,Qiang Gao,Meng Zong,Mingyue Wang,Jianbin Qin
Three kinds of carbon-based fillers (thermally reduced graphene oxide-carbon nanotubes (TG-CN), chemically reduced graphene oxide-carbon nanotubes (RG-CN), graphene nanoplates-carbon nanotubes (GN-CN)) were synthesized. Their corresponding foams were fabricated by combined process of compression-molding and batch-foaming. While GN-CN/PMMA composite foams presented the bimodal microcellular structure, composite foams with RG-CN and TG-CN hybrids still shown typical unimodal cell-size distribution. Much higher electrical conductivity and electromagnetic interference shielding efficiency (EMI SE) were achieved in the TG-CN/PMMA foams, which is closely associated with high intrinsic electrical conductivity and thin hierarchical structure of TG-CN hybrids. Specifically, a prominent electrical conductivity of 2.92 S/m and an absorption-dominated EMI-SE of more than 30 dB in the X-band were achieved in the lightweight TG-CN/PMMA foams (~0.65 g/cm 3 ) at 10 wt% loading. These results demonstrate the TG-CN hybrids are highly promising nanofillers which could endow the composite foams with superior conductive and mechanical performance towards outstanding EMI-shielding application.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiuru Su,Chuan Xu,Jianming Liao,Zhan Liu,Daoheng Liu,Mengting Ye,Long Li,Zhuhan Xu,Shasha Guo,Jun Li
Foam materials hold great promise in construction and packaging applications. However, the non-biodegradability and poor thermal stability of petroleum-based foams present serious environmental and safety concerns. It is crucial to develop sustainable, eco-friendly foam fabrication methods that balance environmental responsibility with high performance. In this study, a novel high-strength, heat-resistant, and water-stable composite foam (FPLs) made from Lignin-based waterborne polyurethanes (LWPUs) and Cellulose fibers, derived from full-component utilization of lychee pruning waste, is introduced. A eco-friendly and simple method utilizing LWPUs crosslinking to fabricate composite foams has been developed, bypassing the need for special drying and ensuring scalability. The FPLs exhibits a high compressive modulus of 455.8 kPa and a yield strength of 191.2 kPa due to the interaction between the LWPUs adhesive and the cellulose fibers. In addition, it demonstrates natural water resistance (maximum contact angle of 122°), exceptional photothermal conversion performance (reaching a peak temperature of 199.7 °C under infrared laser irradiation), superior thermal stability (no deformation up to 250 °C), and insulation performance (thermal conductivity of 0.038 W/mK), while maintaining excellent degradability and recyclability. These materials hold promise as sustainable alternatives to conventional plastic-based foams, providing a viable solution to mitigate the pervasive issue of “white pollution.”
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2021
·
IF 9.298
Zhouping Sun,Jiali Chen,Xichen Jia,Guoqing Wang,Bin Shen,Wenge Zheng
Though conductive polymer composite (CPC) foams have been investigated widely for electromagnetic interference (EMI) shielding owing to their low density and high EM absorption, fabricating high-performance CPC foams through a simple and easy-to-scale preparation process, as well as exploring new approach to achieve the shielding enhancement of CPC foams under mild conditions for meeting some special circumstances that needing higher shielding effectiveness (SE) in a short time, is still of great importance. In this work, multifunctional polyimide/carbon nanotube composite foams (PIF/CNT) were manufactured by the combination of effective chemical-foaming method and simple solution dip-coating approach. The resultant PIF/CNT with ultralow density exhibited the integration of excellent performances on absorbing-dominant EMI shielding with the extreme-temperature adaptability, flame retardancy , thermal insulation , infrared stealth and Joule-heating functions. On the other hand, the idea of humidifying-enhanced EMI shielding is proposed, and the EMI SE of wetted PIF/CNT samples can be massively improved due to the easy adsorption of strongly polar water molecules on the open-cell foam skeleton with hydrophilic poly (vinyl pyrrolidone). By the humidifying-drying cycles to enhance or restore the SE performance, our PIF/CNT material can be adjusted within a certain SE range to achieve intelligent electromagnetic response, providing another important guide for the design of novel intelligent EMI shields.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yongzhen Wang,Xiang Yu,Weiqiang Fan,Rulin Liu,Yuyan Liu
Oil spills threaten ecosystem and health seriously. Porous foams have been proved as ideal candidates for oil absorbents, however, many with poor oil retention (re-bleeding). Here, we creatively developed a composite foam oil absorbent capable of oil absorption and oil gelation , based on porous alginate foam and hydroxyl aluminum stearate oil gelator . The microstructure of alginate foam can be adjusted by the addition of t-butanol in the solvent, and long alkyl chains of gelator endow foam skeleton with good hydrophobicity , avoiding secondary pollution from traditional hydrophobic chemical modification. Interconnected skeleton decorated by oleophilic gelators contributes to high oil absorption. Oleophilic gelator can self-assemble into 3D network to entrap oils to form gels, giving rise to effective oil retention, realizing the integration of high oil absorption and oil retention. The natural abundant, low-cost composite foam would be promising for tackling oil spills.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Bin Shen,Wentao Zhai,Mimi Tao,Jianqiang Ling,Wenge Zheng
Novel high-performance polyetherimide (PEI)/graphene@Fe3O4 (G@Fe3O4) composite foams with flexible character and low density of about 0.28–0.4 g/cm3 have been developed by using a phase separation method. The obtained PEI/G@Fe3O4 foam with G@Fe3O4 loading of 10 wt % exhibited excellent specific EMI shielding effectiveness (EMI SE) of ∼41.5 dB/(g/cm3) at 8–12 GHz. Moreover, most the applied microwave was verified to be absorbed rather than being reflected back, resulting from the improved impedance matching, electromagnetic wave attenuation, as well as multiple reflections. Meanwhile, the resulting foams also possessed a superparamagnetic behavior and low thermal conductiviy of 0.042–0.071 W/(m K). This technique is fast, highly reproducible, and scalable, which may facilitate the commercialization of such composite foams and generalize the use of them as EMI shielding materials in the fields of spacecraft and aircraft.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 7
·6757-6765
·
IF 9.5
Hang Tianyi,Zhou Lijie,Xu Chenhui,Chen Yiming,Shen Jiahui,Zheng Jiajia,Yang Pingan,Li Xiping,Luo Heng,Tong Guoxiu
With the accelerated development of modern detection and communication technology, the multifunctional wearable materials with excellent electromagnetic interference (EMI) shielding, infrared stealth, and human monitoring for improving military combat capability have received extensive attention. In this work, the lightweight melamine foam (MF)@silver nanowires (AgNWs)-iron nanowires (FeNWs) (AgFe-MF) was fabricated by a vacuum-assisted dip-coating method. Due to the porous structure and synergistic electrical and magnetic losses, this lightweight (0.115 g/cm 3 ) composite foam with an ultra-low filler content (0.62 vol.%) exhibited an ideal EMI shielding efficiency of 38.4 dB. On the other hand, the AgFe-MF realized a powerful multifunctional integration. The surface saturation temperature of the AgFe-MF reached 94.2 °C under a low applied voltage of 1.8 V and remained extremely fast heating and cooling response and terrific working stability, resulting in excellent infrared stealth and camouflage effects. Furthermore, taking virtues of the elastic porous conductive architecture, the AgFe-MF was utilized as a piezoresistive sensor exhibiting board compressive interval of 0–1.62 kPa (50% strain) with a good sensitivity of 0.57 kPa −1 . This work will provide new ideas and insights for developing multifunctional wearable devices in the fields of EMI shielding, thermal management, and piezoresistive sensing.
研究领域:
材料科学
·
电子工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Wenwen Guo,Xin Wang,Ping Zhang,Jiajia Liu,Lei Song,Yuan Hu
Thermally insulating materials made from renewable resources are desirable for energy efficient buildings. Traditional petroleum-derived insulating materials such as rigid polyurethane foam and expanded polystyrene display poor flame retardancy and inorganic insulating materials such as silica aerogel are fragile. Herein, we reported a facile approach to prepare cellulose nanofiber (CNF)-hydroxyapatite (HAP) composite foam by a simple freeze-drying process. The resultant HAP-CNF composite foams showed a thermal conductivity in the range of 38.5–39.1 mW/(m K) and very low peak heat release rate (20.4 kW/m 2 ) and total heat release (1.21 MJ/m 2 ). Vertical burning tests also manifested excellent fire resistance and self-extinguishing behaviours. Considering the excellent fire resistance of this composite foam, it is of significance to fire safety solution for buildings insulating materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）