COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Mingyue Wu,Linchuan Yang,Haijun Lei,Mengmeng Zhang,Rui Zhang,Rui Liu,Tongtong Zhao,Xiaoyang Xu,Yaxin Guo,Yuheng Zhu,Gang Liu,Qingzeng Zhu
Silver-filled polydimethylsiloxanes (PDMS) are expected to be used as various advanced materials . The role of silver particles on the reinforcement and rheological behaviors of PDMS composites has not been sufficiently investigated. In addition, the processing of highly viscous PDMS mixed Ag particles is a difficult work. In this work, uniformly dispersed filled PDMS composites with macro-nano Ag were prepared by an in-situ polymerization method. The viscoelasticity and strain amplitude ( ε ) dependent rheology, also known as Payne effect, of the Ag in-situ filled PDMS composites were studied in compared with those of fumed silica-filled PDMS systems, helping to comprehend the microcosmic deformation mechanisms . Bound rubber in Ag-filled PDMS was at a low level. Ag provided a reinforcement effect and introduced a rheological nonlinearity in the PDMS composites at a critical loading of 6.10 wt%. The critical strain ( ε c = 76.5%) of vulcanized Ag-filled PDMS was insusceptible with Ag contents in the range of 3.04 wt% to 14.70 wt%. Ag and fumed silica in the composites showed different rheological behaviors.
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
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 6
·3535-3543
·
IF 5.2
Sijie Qin,Ling Weng,Xiaohang Sun,Xin Yu,Lizhu Guan,Zijian Wu
With the performance improvement and size reduction of electronic equipment, the internal circuit power consumption increases and heat is generated too much. The accumulation of heat will affect the stability, durability, and service life of electronic equipment. Therefore, efficient heat dissipation is the mainstream thinking direction to solve this problem. This experiment uses the synergetic effect of two particles. With epoxy (EP) resin as the matrix, boron nitride nanoparticles are coated with polydopamine (PDA), and the hydroxyl group on the surface of PDA is modified with coupling agent. The sulfhydryl group on the coupling agent is combined with silver (Ag) nanoparticles, and finally the epoxy resin composite containing boron nitride-polydopamine-silver (BPA) core–shell structure is obtained. With 15 wt%. BPA filler, the thermal conductivity of this material is 0.275 W/mK, 1.54 times that of pure epoxy resin 0.179 W/mK. The breakdown strength is 8.931 kV/m, 1.05 times that of pure epoxy resin 8.493 kV/m. The impact strength is 4.06 kJ/m 2 , 1.37 times that of pure epoxy resin 2.97 kJ/m 2 . At the same time, the shape of this material has good customization and is expected to be applied in the field of thermal management materials.
研究领域:
材料科学
·
热管理
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 8
·1237-1246
·
IF 4.803
Sun Xiaofei,Feng Shijie,Zhang Zhe,Zhang Pengyu,Zhao Jiefeng,Gao Yunling,Yun Junxian
A Ag particle-coated and 1-dodecanethiol-modified melamine sponge (Ag-DDT-MS) was prepared through surface roughness by coating silver particles and subsequent grafting of a hydrophobic long hydrocarbon chain. Superhydrophobic and 3D porous Ag-DDT-MS was characterized by Fourier transform infrared spectroscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The water contact angle of Ag-DDT-MS reached 159.2°. Ag-DDT-MS exhibited excellent absorption capacity for high viscous oils and organic solvents, ranging from 42.8 to 105.2 g·g −1 . The absorbed oils can be easily collected by the mechanical pressing process, and the oil recovery rate was satisfactory, more than 90% after 20 recycles. Ag-DDT-MS material also demonstrated good stability and excellent compression-recovery ability, keeping 88.6% of the initial height after ten compression-release cycles.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 1
·509-524
·
IF 6.123
Liu Yali,Zhang Sufeng,Hua Chen,Li Nan,Li Lei
Technological advancements in flexible and wearable electronics have driven a boom in high-performance flexible electrodes. In this study, a simple and low-cost bio-inspired filter paper (FP) template method using the interfacial-aided polyethyleneimine-functionalized filter paper (FP-PEI) was developed to fabricate highly flexible silver-based conductive films. The FP was modified through amination to obtain FP-PEI with the rigid cellulose backbone and the flexible side chain of grafted amino groups, which played a key role as an interfacial layer during the chemical deposition of fractal-structured silver particles (FSSPs). The naturally porous and rough network structures of FP templates provided structural support and network for the deposition of conductive materials. In addition, the high porosity of FP facilitated the effective transfer of electrons, and its nano- or micro-scale rough surface structure promoted the formation of strong adhesion between the cellulose substrate and the conductive layer, which was crucial for the conductive stability of the device. The obtained conductive films (FP-PEI/FSSPs) exhibited a low sheet resistance of 1.47 Ω sq −1 , a conductivity of 3401 S m −1 , and good mechanical properties with a stress strength of 6.17 MPa. Moreover, FP-PEI/FSSPs exhibited a stable electrical conductivity (the sheet resistance only increased by 0.06 Ω sq –1 through 500 bending cycles), thermal stability (the maximum thermal decomposition rate increased from 349.3 to 357.8 °C), and oxidation resistance (the sheet resistance increased by only 0.04 Ω sq –1 after FP was exposed to the air for 15 days). The results indicate that FP-PEI/FSSP conductive films can be a potential green flexible electronic material. Graphical abstract
研究领域:
柔性电子
·
材料科学
·
纳米技术
·
导电材料
✓ 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）