Fire-Switzerland
·
2026
·Vol. 9
·期 2
·81
·
IF 3.2
Zhi Li,Fang Zhou,Kai Shen,Miao Liu,Yumin Duan,Jiahui Chen,Shuai Li,Haoxuan Yu
Polyimide aerogels (PIAs) possess enormous application potential in high-temperature thermal insulation scenarios. As high-efficiency thermal insulation materials, their thermal safety and thermal insulation performance are of crucial importance. Currently, poor dimensional stability, high-temperature pyrolysis, and severe shrinkage remain the key factors restricting their development and practical application. In this work, we employ an in situ co-gelation synthesis strategy, where methyltrimethoxysilane (MTMS) is introduced as the silica precursor to fabricate SiO2/polyimide aerogels (Si@PIAs). This strategy enhances the interfacial bonding strength between the organic and inorganic phases, enabling their complementation of strengths. Experimental results demonstrate that the incorporation of the inorganic SiO2phase endows Si@PIAs with higher thermal safety, superior thermal insulation performance, lower density, and reduced shrinkage. Among them, Si10@PIA performs best with a density of 85 mg/cm3, a thermal conductivity of 23.28 mW/(m·K), and a heat flow peak temperature of 720.7 °C. More importantly, pyrolysis analysis reveals that the pyrolysis process of Si@PIAs shifts to a randomized nucleation and growth model (n= 2/5) with the mechanism functiong(α) = [−ln(1 −α)]5/2. Compared with pure PIAs, Si@PIAs possess stronger resistance to pyrolysis, lower gross calorific value, and improved thermal safety. This study provides theoretical and practical guidance for the development of high-performance aerogel materials, promoting their application in lithium-ion battery separators, high-temperature insulation, and fire-resistant materials.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Huizhen Jiang,Bin Yang,Yuhang Wu,Funing Zhang,Huaiyuan Wang,Weina Kong,Fatang Liu
Conventional adhesives typically form strong and durable bonds only on dry surfaces, and their adhesion effectiveness often weakens or disappears entirely in the presence of water at the bonding interface. Thus, developing high-performance adhesives suitable for underwater applications is crucial. In this study, we successfully developed a high-strength (4.13 MPa) epoxy-based underwater adhesive (called MGEO) using a simple one-step, solvent-free strategy. After underwater adhesion, the adhesive rapidly transforms from liquid to solid at room temperature, forming a strong adhesion that requires no additional processing. The hydrophobic effect of the long aliphatic chain (C18) effectively facilitated water displacement at the interface, while multiple intermolecular interactions enhanced interfacial adhesion, ensuring strong and reliable underwater performance. Additionally, the adhesive exhibited excellent adhesive stability after it was immersed in different aqueous solutions for 20 d [alkali (3.39 MPa), salt (4.37 MPa), and artificial seawater (4.28 MPa)]. Moreover, the adhesive exhibited outstanding long-term stability in water and a strength of 3.87 MPa after 50 d of immersion. After the adhesive underwent 50 cold-hot shock cycles, it exhibited a strength of 3.59 MPa. After it underwent five underwater adhesion cycles, its strength was 2.29 MPa. The long-term durability of MGEO adhesive underwater demonstrates its excellent application potential in underwater repair.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2026
·Vol. 18
·期 7
·782
·
IF 5.8
Qing Peng,Wenxiang Zhang,Qiwei Pan,Shumei Liu,Jianqing Zhao
The development of high-performance polymers exhibiting both low dielectric constant (Dk) and low dielectric loss (Df) at high frequencies is highly desirable yet challenging for applications in microelectronics and wireless communication technologies. In this work, a series of siloxane-containing poly(ester imide)s (SiPEIs) are designed and synthesized via a two-step polymerization route, using 1,4-phenylene bis(1,3-dioxo-1,3-dihydroisobenzofuran-5-carboxylate) (TAHQ) as the dianhydride monomer, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane (DMS) together with 4,4′-diaminodiphenyl ether (ODA) as the diamine comonomers. Although the introduction of short siloxane segments lowers the glass transition temperature (Tg) and the tensile strength of the resulting PEIs, they still remain at a relatively high level. Liquid crystalline phase behavior is observed at lower temperature for the siloxane-containing PEIs. Meanwhile, the hydrophobicity and the high-frequency dielectric performance is effectively improved with increasing siloxane content. Notably, SiPEI-20, prepared with 20 mol% DMS, displays an outstanding integrated performance. It exhibits aTgof 200 °C, a Dkof 2.87 and a Dfof 0.00155 at 10 GHz, as well as an adhesive strength of 0.85 N·mm−1on copper foil. Overall, this work provides a feasible strategy by incorporating siloxane into the PEI backbone, enabling the synergistic enhancement of high-frequency dielectric properties (simultaneous reduction in Dkand Df) and adhesion to copper foil.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
·
2026
·
IF 3.4
Ying Yang,Kaiming Li,Guorong Cui,Xinbo Wang
A series of bismaleimide-based prepolymers via the Michael addition reaction of N,N’-4,4’-diphenylmethane-bismaleimide (BDM) and 4,4’-diaminodiphenyl ether (ODA) were prepared and used as adhesives for bonding CFRP/stainless steel, which present excellent performance. The manipulating mechanism of the molar ratio on the structure-performance relationship was revealed. Stronger interaction of macromolecular chains (i.e. hydrogen bond force) becomes increasingly obvious with increase of the molecular weight (molar ratio of BDM/ODA decreases), evidenced by FTIR peak shift of characteristic functional group in macromolecular chains. The optimal BDM/ODA molar ratio of bismaleimide-based prepolymers is 6:5, on which lap shear strength (LSS) reaches a maximum value of 20.59 MPa; though the thermal stability (T5d = 301 °C) and compressive strength (123.94 MPa) are not the best amongst these prepolymer adhesives, it really meets the requirement for high-temperature resistance as adhesive for bonding CFRP/stainless steel; it is the manipulating of molecular weight that achieves a balance between the cohesive strength and interfacial adhesion strength, which contributes to the highest LSS value (20.59 MPa) and testified by fracture morphology of the bonding interface. This is a facile and low-cost method for enhancing the lap shear strength between CFRP and metal substrate.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Shi-Chun Zhang,Xue-Shan Yu,Yong-Ming Zhang,You-Feng Wang,Wei-Bin Ma,Ai-Jun Jiao,Zhi-Wei Li,Tong Su,Zhen-Hai Fu
The "cold decomposition-direct flotation" method is presently the predominant technique for KCl production from carnallite ore. However, this process has been hindered by the interactions between NaCl and KCl, resulting in suboptimal product purity and the potassium recovery rate. This study investigated the influence of the decomposition solution's composition on the concentrate grade of KCl. Initially, flotation tests with NaCl and KCl mixtures revealed that fine and newly formed NaCl adversely affected concentrate grade of KCl. Subsequently, we investigated the effects of NaCl, KCl, and MgCl 2 solutions as decomposition solution on the grade of KCl flotation concentrates. The results showed that higher MgCl 2 concentrations significantly increased particle size and concentrate grade of KCl. Additionally, experiments with diluted decomposition mother liquor (the triple-saturation point E) demonstrated that lower dilution ratios enhanced concentrate grade of KCl, suggesting that the decomposition mother liquor can be adjusted to an appropriate concentration for the decomposition of carnallite ores in industrial applications. This study provides valuable insights for addressing the challenges of low concentrate grade and the inefficient utilization of carnallite ore.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2026
·
IF 14
Jv Li,Chunwang Xu,Hongmei Chen,Kejing Yu,Gang Liu,Fenghua Zhang,Wenbing Li
Designing flexible electromagnetic interference (EMI) shielding materials that transition from static shielding to dynamic adaptability remains a significant challenge in the development of next-generation electronic protection. In this study, we fabricated a reusable flexible polyimide (PI)/MXene/silver nanowires (AgNWs) (PMA) EMI shielding composite film by assembling MXene and AgNWs onto a shape-memory PI matrix using a vacuum-assisted filtration technique. When the ratio of MXene to AgNWs was 2:1, the composite film exhibited a maximum electrical conductivity of 132 S/cm and an EMI shielding effectiveness of 60.68 dB in the X-band (8.2-12.4 GHz). After further optimizing the material structure, the gradient-structured PMA composite film (G-PM 2 A 1 ) achieved a shielding effectiveness of 67.85 dB. The shielding performance remained essentially unchanged under harsh conditions, including ultrasonic cleaning, acid corrosion, high temperature (250 °C), and low temperature (−196 °C). Owing to the intrinsic shape-memory properties of polyimide, the film could recover its original structure after repeated deformation-heating cycles, maintaining an EMI shielding effectiveness above 60 dB. Moreover, the composite film exhibited excellent thermal stability, mechanical strength, and flame retardancy. Its lightweight, flexibility, and environmental stability indicate potential for localized EMI shielding applications relevant to electric vehicle battery systems, where lightweight, flexible, and environmentally robust shielding layers are required.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Anis Alam,Tingkai Zhao,Syeda Khair Un Nisa
Flexible solid-state supercapacitor electrodes require fiber-shaped conductors that combine high electrical conductivity and textile-level mechanical compliance. However, transforming engineering polyimide (PI) fibers from electrically insulating structural supports into integrated conductive electrodes without sacrificing their intrinsic mechanical integrity remains a significant challenge. In contrast to previously reported MXene/CNT/polymer-based flexible fibers, which are predominantly built on soft or elastomeric matrices, achieving high conductivity within a high-temperature structural polyimide while preserving its strength and toughness remains largely unexplored. Herein, we converted intrinsically insulating PMDA–ODA polyimide (PI) into conductive and mechanically robust fibers by wet-spinning of Ti 3 C 2 T x MXene- and carbon nanotube (CNT)-loaded polyamic-acid (PAA) dopes followed by thermal imidization. The resulting MXene (2D)–CNT (1D)–PI fibers exhibit a hierarchical 1D–2D conductive network in which CNTs bridge MXene sheets, suppress restacking, and reduce interflake resistance. The experimental results show that the electrical conductivity increases from ∼1.6 × 10 –10 S·m -1 for pristine PI to 1.61 S·m -1 for MXene/PI and further to 1.5 × 10 2 S·m -1 for MXene–CNT–PI. Using a solid H 3 PO 4 /PVA gel as the electrolyte, the optimized multicomponent fibers display nearly rectangular cyclic voltammetry curves, quasi-triangular charge–discharge behavior, volumetric capacitances of 80–20 F·cm -3 at 0.05–0.20 A·cm -3 , and ∼68% capacitance retention after 5000 cycles. Importantly, despite the incorporation of conductive nanofillers, the fibers retain high tensile strength (∼200 MPa), large elongation (∼35–40%), and high toughness (∼30–32 MJ·m -3 ), approaching that of pristine PI. This work demonstrates a scalable strategy to convert structural polyimide fibers into conductive, mechanically robust electrodes suitable for flexible solid-state energy-storage systems.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Lei Kang,Xinzhe Dang,Fei Li,Zhen Zhang,Jiantong Yun,Tongze Zhang,Ni Gao,Lei Feng,Shengdan Wang
Conventional superhydrophobic materials for oil–water separation often suffer from poor durability, limited versatility, and environmental concerns arising from fluorine-containing components. To address these drawbacks, this study reports a fluorine-free superhydrophobic stainless steel mesh (ODA‑NS/MUF‑SH‑SSM) fabricated using natural nano‑soil (NS) as a green, roughness-enhancing component, representing a key environmentally friendly breakthrough. The mesh was prepared through two simple steps: spray‑coating with NS/melamine‑urea‑formaldehyde resin (NS/MUF) to construct a micro‑nano rough structure, followed by grafting octadecyl acrylate (ODA) to reduce the surface energy. Characterizations, including SEM, FTIR, EDS, and XPS, confirmed successful surface functionalization. The modified mesh exhibited a water contact angle >160°, rapid oil permeation within 0.4 s, and separation efficiencies >98% for various oil–water mixtures over 100 cycles. Durability tests showed that it retained a contact angle >140° after 100 friction cycles under a 200 g load. This fluorine‑free, natural nano‑soil‑based design aligns with environmental sustainability while overcoming key limitations of traditional superhydrophobic materials, thereby enhancing practical applicability.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 5.1
Fang Suo,Tao Wan,Fei Chang,Jianwei Cui,Yongtao Yao,Weijian Yuan,Xuelin Zhang,Yanju Liu
With the rapid development of aerospace engineering, geological exploration and intelligent fire protection, increasing attention has been directed toward sensing technologies for high temperature environments. In this case, flexible mechanical sensors still face challenges such as high temperature resistance and temperature drift. In this study, a novel biomimetic material was proposed to improve thermal resistance and solve the problem of high temperature drifting of sensors. Drawing inspiration from the structure of cuttlebone, a bioinspired anisotropic polyimide aerogel (BA-PA) using polyimide has been developed with bidirectional freezing method. The BA-PA exhibits excellent thermal stability and good fatigue resistance, making it an ideal dielectric layer for capacitive sensors. BA-PA sensor demonstrates stable force-electrical response and an ultrafast response time (∼10 ms). Meanwhile, the sensor operates stably with wide range from 20°C to 340 °C. Finally, the BA-PA sensor was demonstrated to possess the capability of achieving both tactile and gesture sensing. This work expands the application scope of polyimide aerogels and provides a new strategy for sensing under high-temperature environment.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.9
Liu Fatang,Jiao Yuxin,Wang Qingyu,Hu Qingbo,Jiang Huizhen,Wang Huaiyuan
Bio-based polyurethane (BPU), as an ideal alternative to traditional petroleum-based polymers, is generally faced with issues such as poor mechanical properties, short service life and insufficient stability, which limit its application in the field of high-end protection. This work proposes a multi-component regulation mechanism centered on hierarchical hydrogen-bonding and phase separation synergy, which balances the mechanical properties and self-healing performance of castor oil-based polyurethane (BPU-Px-Cy). By adjusting the ratio of soft-hard segments and rigid cellulose acetate, the hydrogen bond content of the BPU-Px-Cy series can be regulated to construct hard-phase microdomains. Notably, the optimal sample BPU-P2-C3 achieves a tensile strength of 10.5 MPa and an elongation at break of 94.59%. The abundant hierarchical hydrogen bonds within the system inhibits molecular chain crystallization, forming a stable amorphous structure that enables the material to achieve a light transmittance of 96.45%. Furthermore, by utilizing hierarchical hydrogen-bonding and long alkyl chains to construct a reversible molecular network, chain segments flow upon heating, enabling the material to self-heal completely within 90 s in water at 100 °C. The excellent hydrophobicity of the material (contact angle of 107.53°, swelling rate of 1.07% after soaking in water for 6.5 days) acts synergistically with the internal high-density cross-linked network, leading to a corrosion protection efficiency of 99.99% for steel plates. This work provides a new approach for the development of long-lasting smart protective coatings suitable for applications in metal corrosion protection, architectural decoration and optical protection.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Jiang Guo,Yukun Sun,Xinyi Zhao,Jiawei Wang,Honglin Wu,Luo Kong,Wenling Wu,Yuan Fang,Qing Wu,Jianfeng Zhu
Achieving low reflection loss, broad absorption bandwidth and lightweight remains a major challenge for electromagnetic wave absorption (EWA) materials. In this work, the lightweight multifunctional polyimide composite aerogels reinforced with two-dimensional Co-anchored MXene (Co/MXene) and one-dimensional CoFe 2 O 4 -decorated carbon nanofibers (CoFe 2 O 4 /CNF) were successfully prepared for high-performance EWA. The dielectric and magnetic losses were significantly improved due to the unique heterogeneous porous structure in the composite aerogels. The aerogels achieve a minimum reflection loss of -59.4 dB at 7.6 GHz with a thin thickness of 2.31 mm, and the effective absorption bandwidth could be 4.24 GHz with an ultrathin thickness of 1.25 mm. The outstanding EWA performance can be attributed to the synergistic contribution of conductive loss, interfacial polarization loss, dipole polarization loss and magnetic loss. Moreover, the porous PI framework plays a crucial role in optimizing impedance matching and structural stability. The composite aerogels also demonstrate potential for radar stealth and thermal insulation. This work presents a new strategy for designing multifunction EWA materials.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Yuqing Hu,Weixuan Zhang,Wuwei Feng,Ping Cao,Yan Zhang,Jinzhang Liu
Advanced polymer dielectrics are in high demand for building film capacitors with high-temperature tolerance and high energy density. Conventional polyimide is well known for high-temperature resistance, yet its capacitive energy storage performance is unsatisfactory. Herein, a new-type soft-hard block copolyimide film with high electrostatic energy storage density and low dielectric loss at high temperatures is reported. This copolymer film with optimized ratio of hard to soft segments exhibits nanoscale microphase separation structures, which act as a plethora of deep charge traps for enhancing the breakdown strength. The hard segments containing trifluoromethyl and sulfone groups show microphase separation and help to increase the dielectric constant to ~ 5. In addition, these hard segments not only widen the energy bandgap, but also increase the glass transition temperature of the copolymer. The optimized block copolyimide film exhibits high discharged energy densities (U d ) of 8.0 J cm −3 at room temperature and 6.02 J cm −3 at 150 °C, along with a high charge-discharge efficiency (η) of 90%. The maximum U d reaches 6.9 J cm −3 with η = 84.3%. The effect of microphase separation in the block copolyimide on enhancing the high-temperature capacitive energy storage performance is discussed in detail.
✓ 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）