Journal of Materials Chemistry A
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2022
·Vol. 10
·期 40
·21379-21389
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IF 14.511
Xi Lu,Yusheng Ye,Wenhui Shang,Simin Huang,Haifei Wang,Tiansheng Gan,Guokang Chen,Libo Deng,Qixing Wu,Xuechang Zhou
Conductive textiles are promising components for next-generation wearable electronics. However, it is still a challenge for current conductive textiles and wearable electronic devices to survive in harsh environments, such as extreme mechanical damages and low/high-temperature stresses. Herein, we report ultrastrong, flame-retardant, intrinsically weldable, and highly conductive metallized Kevlar fabrics (MKFs) fabricated via polymer-assisted electroless deposition (ELD) and electrodeposition (ED) techniques. The combination of ELD and ED techniques effectively metallizes the Kevlar fabrics, enabling ultrahigh conductivity (sheet resistance <0.007 Ω sq−1). More importantly, the deposited metal layers significantly enhance the anti-impact properties of Kevlar fabrics by 2–3 times. Due to the inherent properties of Kevlar and effective metal coatings, the MKFs maintain conductivity while suffering various mechanical damages (GPa-scale tensile strength, cutting, sticking, etc.), high temperatures (∼300 °C), and even flame stresses. Surprisingly, the MKFs show intrinsic weldability with traditional solder materials. The multifunctional applications of such high-performance metallized fabrics are demonstrated as textile-based conductors, heaters, and supercapacitors, all of which could survive in extremely harsh conditions.
研究领域:
材料科学
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纺织工程
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电子工程
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产品关联
DOI
高影响因子
ChemSusChem
·
2024
·Vol. 17
·期 14
·e202301708
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IF 7.5
Sujuan Zhang,Jianjun Yi,Jiming Chen,Yong Li,Baoliang Liu,Zaijun Lu
Graphical In this study, imine-containing polybenzoxazine vitrimer (C-ABZ) was synthesized through a condensation reaction between an aldehyde-containing benzoxazine oligomer (O-ABZ) and 1,12-dodecanediamine. The dynamic exchangeable characteristics of imine bonds impart C-ABZ with weldabilities and reprocessabilities. At the same time, the hydrophobic polybenzoxazine backbone significantly improve the water resistance of imine bonds. Traditional polybenzoxazine thermosets cannot be reprocessed or recycled due to the permanent crosslinked networks. The dynamic exchangeable characteristics of imine bonds can impart the networks with reprocessabilities and recyclabilities. This study reported a weldable, reprocessable, and water-resistant polybenzoxazine vitrimer (C-ABZ) crosslinked by dynamic imine bonds. It was synthesized through a condensation reaction between an aldehyde-containing benzoxazine oligomer (O-ABZ) and 1,12-dodecanediamine. The resulting C-ABZ was able to be welded and reprocessed due to the dynamic exchange of imine bonds. The tensile strengths of the welded C-ABZ and the reprocessed C-ABZ after three cycles of hot-pressing were 76.7, 81.3, 70.8, and 58.1 Mpa, with corresponding tensile strength recovery ratios of 74.1 %, 78.6 %, 68.4 %, and 56.1 %, respectively. Furthermore, the polybenzoxazine backbone significantly improved the water resistance of the imine bonds. After immersing in water for 30 days at room temperature, the weight gain of C-ABZ was less than 1 % with corresponding tensile strength and tensile strength retention ratio of 59.5 Mpa and 57.5 %, respectively. Although the heat resistance of C-ABZ decreased slightly with increased hot-pressing cycles, a glass transition temperature ( T g, tanδ ) of 150 °C was retained after the third hot-pressing. Overall, these findings demonstrate that the C-ABZ possesses excellent comprehensive performances.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2025
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IF 4.7
Zelong Li,Shiqi Qin,Zhongyang Bai,Yingcheng Hu
The demand for renewable fiber-based epoxy composites is increasing rapidly as a sustainable alternative to conventional synthetic composites. However, limited attention has been directed toward the degradation and reprocessing of the epoxy resin matrix, which could further enhance the environmental benefits of natural fiber-reinforced epoxy composites. This study utilized delignified basswood as a porous template to in situ synthesize epoxy vitrimers based on dynamic ester exchange reactions through vacuum impregnation, successfully preparing a Wood/Epoxy Vitrimers Composite (WEPVC). Unlike traditional wood–epoxy resin composites, WEPVC demonstrated thermally activated topological rearrangement behavior at 180 °C, achieving thermal welding repair and three cycles of mechanical crushing and hot-press reprocessing. In ethylene glycol solution, the material could be completely degraded within 240 min to recycle both the wood template and resin oligomers. The composite simultaneously exhibited excellent mechanical properties (tensile strength 73.21 MPa), thermal stability (degradation onset temperature 273 °C), and water resistance (water contact angle 82°). These combined properties make the WEPVC developed in this study an environmentally friendly, cost-effective candidate for sustainable structural materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
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IF 6.3
Yinghu Sun,Jiahao Liu,Shenghua Ma
With the advancement of photovoltaic technology, the mechanical and electrical reliability of Ag electrodes has become increasingly critical, emerging as a key bottleneck limiting module lifetime and power output. This study addresses the performance optimization of glass frits in the front-side Ag paste of tunnel oxide-passivated contact (TOPCon) solar cells by proposing a hybrid high and low temperature glass frit system to enhance solder joint reliability. Two base glass frits, L1 (high melting point) and G1 (low melting point), were prepared via the melt-quenching method. The hybrid glass frits, designated as M1, M2, and M3, were obtained by blending the base frits in mass ratios of 5:5, 7:3, and 3:7, respectively. A systematic investigation was conducted on the physicochemical properties, thermal behavior, and wetting characteristics of the hybrid glass frits, as well as their effects on the interface structure of the Ag electrode, grid line morphology, and soldering performance. Results indicate that the hybrid glass frits effectively broaden the melting range, optimize high-temperature viscosity and wetting behavior, and significantly improve the compactness and uniformity of the Ag-Si interface. By precisely adjusting the mixing ratio, the properties of multiple glass components can be synergistically combined to enhance the adhesion between the busbar and the Si substrate while dynamically optimizing the bonding speed between the solder and the Ag layer. This approach markedly improves the soldering reliability of solar cells. Among the samples, M2 (L1:G1 = 7:3) demonstrated the best soldering performance, with an average pull force of 4.304 N and the highest practical soldering rate, effectively enhancing the reliability of busbar soldering. This study offers a new direction for material design in photovoltaic Ag pastes.
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 43
·26858-26866
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IF 3.108
Peiyao Yan,Wei Zhao,Xiaowei Fu,Zhimeng Liu,Weibo Kong,Changlin Zhou,Jingxin Lei
Environmental protection and resources exhaustion have become the two major obstacles that the human race faces. Moreover, conventional thermoset polymers, which have been extensively applied in various fields, are difficult to be reprocessed and recycled thereby resulting in a wastage of resources and environmental pollution owing to their chemical crosslinks. Therefore, vitrimers may be a good option to solve this problem. In this study, renewable castor oil was used as the raw material to synthesize multifunctional polyurethane-vitrimers (PUVs), whose intrinsic carbamate bonds undergo transcarbamoylation reactions in the presence of a catalyst. Reprocessing experiments have shown that reprocessed PUVs have nearly the same excellent tensile property compared with the pristine PUVs and have significant potential for future engineering applications. Subsequent studies have indicated that crosslinked networks have properties of thermally-induced dual-shape memory effect (dual-SME) and self-welding due to transesterification reactions of carbamate bonds. As the current methods of dealing with abandoned thermoset polyurethanes have drawbacks, it can be anticipated that our findings will create significant benefits for our life.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2021
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IF 3.975
Xiaohong Liu,Xuan Song,Bifang Chen,Jiaming Liu,Zhiqiang Feng,Wenchao Zhang,Juanjuan Zeng,Liyan Liang
The fabrication and development of excellent thermoset polymers with self-healing and shape memory properties is highly desirable. Herein, a novel high-strength epoxy resin (EP-SeSe) with diselenide bonds was rationally designed for rapid repair materials in building constructions and electrical packaging. The resultant resins exhibit excellent shape memory performance and self-healing performance due to the dynamic diselenide bonds (Se Se), while maintaining a high mechanical strength (tensile strength = 105 MPa and E = 2.0GPa), and exceptional thermal stability. It is especially noteworthy that the diselenide bonds of the bis(4-aminophenyl) diselenide (BAPDSe) allow EP-SeSe to exchange molecular chains in a dynamic manner, facilitating transport of chain segments while the ortho-phenyl groups prevent the side effects of weak bonds on mechanical properties . Furthermore, when the temperature exceeds Tg , EP-SeSe displays fast stress relaxation, self-healing, remodeling, and weldability due to the [2 + 1] radical-mediated mechanism of the diselenide bonds. We envision that this study provides a facile method for constructing robust multifunctional epoxy resins, which have great potential applications for self-healing and shape-memory epoxy resins.
研究领域:
材料科学
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聚合物化学
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机械工程
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产品关联
DOI
高影响因子
Additive Manufacturing
·
2021
·
IF 10.998
Zhuo Sun,Yahui Lu,Qian Zhao,Jingjun Wu
3D printing hydrogels with a good resolution, diversified geometries, and a tunable mechanical performance is still a big challenge, which is mainly due to the low photo-reactivity of the high-water containing precursor and the low modulus of the photo-cured hydrogel. In the present work, an acryloylmorpholine - acrylic acid - PEG diacrylate drygel was firstly printed with a good fidelity and subsequently post- treated with an aqueous solution containing specific ions, during which hydration of the hydrophilic network and coordination between the carboxyl and ions occurred simultaneously. The obtained dual-crosslinked hydrogel combined a complex geometry and a good stretchability. This approach decoupled the printability and mechanical properties of the hydrogels. To furtherly show this advantage over conventional direct hydrogel 3D printing, ultrasoft hydrogel lattice structures which cannot be self-supported and purely ionic crosslinked hydrogels with a good self-weldability were demonstrated.
研究领域:
材料科学
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3D打印
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高分子化学
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机械工程
✓ 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）