EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Minhui Wang,Jiahui Zhou,Xiaolin Jiang,Yeming Sheng,Min Xu,Xun Lu
Self-healing materials have attracted considerable attention because of their sustainable property of prolonging service life and reducing resource consumption. However, as plenty of room-temperature self-healable materials have been studied, it still remains a great challenge to equip these materials with admirable mechanical strength since there is a compromise between intermolecular interactions and chain mobility. Herein, a novel strategy of integrating self-healing ability with robustness in polymeric elastomer at ambient condition was developed. The synthesized polyurethane was equipped with multiple reversible interactions including disulfide bonds, oxime urethane bonds, H-bonds and coordination interactions, and formed triple cross-linking network. What’s important is that Cu 2+ could not only act as the coordination center, but also serve as the catalyst to accelerate disulfide exchange and oxime urethane exchange reaction. XPS and stress relaxation tests revealed that the introduction of CuCl 2 reduced the relaxation activation energy of both the disulfide metathesis and oxime urethane exchange reaction. Thanks to the multiple interactions design and the effects of Cu 2+ , the elastomer was endowed with excellent mechanical strength of 19.5 MPa and self-healing efficiency of 83% at room temperature.
研究领域:
材料科学
·
聚合物化学
·
机械工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ting Wang,Jin Xu,Ying-jiao Zhan,Lei He,Zhi-Cheng Fu,Jin-Ni Deng,Wen-Li An,Hai-Bo Zhao,Ming-Jun Chen
Atmospheric drying method for fabricating aerogels is considered the most promising way for casting aerogels on a large scale. However, the organic solvent exchange, remaining environmental pollution risk, is a crucial step in mitigating the impact of surface tension during the atmospheric drying process, especially for wet gel formed through the alkoxy-derived sol-gel process, such as melamine-formaldehyde resin (MF) aerogel. Herein, a tough polymer-assisted in situ polymerization was proposed to fabricate MF resin aerogel with a combination of mechanical toughness and strength , enabling it to withstand the capillary force during water evaporation. The monolithic MF resin aerogel through the sol-gel method can be directly prepared without additional network strengthening or organic solvent exchange. The resulting MF resin aerogel exhibits a homogeneous as well as hierarchical structure with macropores and mesopores (~6 μm and ~5 nm), high compressive modulus of 31.8 MPa, self-extinguishing property, and high-temperature thermal insulation with 97 % heat decrease for butane flame combustion. This work presents a straightforward and environmentally friendly method for fabricating MF resin aerogels with nanostructures and excellent performance in open conditions, exhibiting various applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2024
·
IF 9.6
Li Zhao-Yang,Zhao Wei-Jun,Sun Yu,Zhou Bing,Feng Yue-Zhan,Liu Chun-Tai
The pressing demand for ultrathin and flexible shields to counter electromagnetic interference (EMI) has sparked interest in Ti 3 C 2 T x MXene materials due to their exceptional electrical conductivity, tunable surface chemistry, and layered structure. However, pure Ti 3 C 2 T x MXene films often lack the mechanical properties required for practical engineering applications, and traditional reinforcement methods tend to reduce electrical conductivity. This work demonstrates an effective strategy to enhance the alignment and densely packed layered structure of Ti 3 C 2 T x MXene films by regulating the acidity and alkalinity of Ti 3 C 2 T x MXene aqueous solutions. This approach simultaneously improves mechanical strength and electromagnetic interference shielding effectiveness (EMI SE). Compared with original Ti 3 C 2 T x MXene films, MXene films modified with ammonia solution (NH 3 ·H 2 O) via OH − show a significant improvement in tensile strength (27.7 ± 1.9 MPa). Meanwhile, MXene films treated with hydrochloric acid (HCl) via H + reach an even higher tensile strength of 39 ± 1.5 MPa. Moreover, the EMI SE values of the treated MXene films increase significantly, each reaching 66.2 and 58.4 dB. The maximum improvements in EMI SE values for the acid- and alkali-treated samples are 17.9% and 4%, respectively. In conclusion, the simultaneous enhancement of mechanical strength and EMI shielding efficacy highlights the potential of acid- and alkali-treated Ti 3 C 2 T x MXene films for applications in ultrathin and flexible EMI shielding materials. Graphical abstract
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2024
·
IF 8.6
Zhengyu Jin,Haixian Liu,Yile Chen,Zhi Wang,Lifang Wang,Jiaping Wang,Hongwei Liu
Long-term marine engineering equipment and infrastructure service will inevitably encounter corrosion and biofouling issues. However, the design and development of the integrated anti-corrosion and anti-biofouling coatings still face challenges. In this work, two types of coatings are designed based on the principles of liquid perfusion on a porous layered double hydroxides (LDH) film. The paraffin coating on LDH film has a good self-cleaning property against sea water, dyed deionized water, and coffee. Due to the resin perfusion, the adhesion force of epoxy resin coating increases by 50.9 % compared to bare steel. NiCo 2 S 4 -CNTs and NiCo 2 S 4 -CNTs-SPT nanomaterials with good anti-bacterial performance are prepared to significantly increase the coatings' mechanical strength, anti-corrosion, and anti-biofouling properties. NiCo 2 S 4 -CNTs-SPT/EP coating possesses the best performance. The stress strength of NiCo 2 S 4 -CNTs-SPT/EP coating is improved by 88.6 %, and the anti-biofouling efficiencies of NiCo 2 S 4 -CNTs-SPT/EP coating focusing on P. aeruginosa and C. vulgaris have high values of 98.66 % and 95.56 %, respectively. NiCo 2 S 4 -CNTs-SPT/EP coating has high impedance values of more than 10 9 Ω cm 2 after 70th day of testing, and the impedance changes little with time. The long-term anti-corrosion ability of NiCo 2 S 4 -CNTs-SPT/EP coating is confirmed by 600 h salt spray tests and 200 d field exposure tests.
研究领域:
材料科学
·
海洋工程
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jiaxiao Sun,Mengqi Duan,Qi Ni,Haotian Zheng,Jiaan Chen,Yongjie Yan,Qing-Qing Ni
Graphene films have limited their applications in flexible sensing due to internal micro-discontinuities and weak interlayer forces. For this reason, carbonized polyacrylonitrile (PAN) was used to cross-link graphene sheets and enhance the interlayer relationships of graphene. Thermal treatment at 250 ºC significantly improved PAN@GOM's structural stability and electrical conductivity, which is key for flexible-sensing devices. This study employs innovative characterization techniques, such as thickness-direction resistance measurement, wear testing, and pressure stability evaluation, to assess the electrical conductivity, mechanical strength, and long-term stability of PAN@GOM. The results showed significant conductivity, mechanical strength, and pressure stability improvements, confirming the samples' suitability for long-term flexible sensing applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Jie Cao,Yajun Wu,Liang Li,Miaomiao Hu,Yun Cheng,Hang Zhang,Jintang Guo
The mechanical strength of conventional hydrogels is inadequate for preventing leakage in high-temperature and high-salinity reservoirs, primarily due to the increased mobility of polymer chains and the degradation of crosslinked networks. Herein, we employed the strategy of ’network nesting and layer reinforcement’ to design a hybrid multi-site crosslinked hydrogel. This approach enhances the interconnections between polymer chains and fortifies the crosslinked network. The shear rheological behavior and temperature sensitive characteristics of the profile control working fluids were evaluated based on rheological dynamics. In the high temperature (140 ℃) and high salinity (21.81 × 10 4 mg/L) preparation environment, the effects of different components to the mechanical strength of the hydrogel were investigated under dynamic shear and uniaxial compression conditions. The incorporation of N-(hydroxymethyl)acrylamide (NMA) in the copolymerization with acrylamide (AM) resulted in an increase in the covalent cross-linking density, leading to a rise in the shear elastic modulus from 105 Pa to 238 Pa. The use of pre-gelatinized cassava starch (PGCM) as the grafting framework enhanced the bonding between the polymer chains, as evidenced by the increase in uniaxial compressive strength from 0.018 MPa to 0.081 MPa and the rise in peak strain from 55.0 % to 72.9 %. Furthermore, the synergistic effect of fumed silica (AEROSIL), which exploits mechanical coupling between inorganic nano-fillers and organic polymers, increased the compressive strength from 0.081 MPa to 0.418 MPa and raised the peak strain from 72.9 % to 81.8 %. It provides an effective approach to enhance the plugging performance of hydrogels in high temperature and high salinity reservoirs.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Du Jiani,Li Tian,Li Jiatong,Tang Jingyuan,Zhang Runhua,Liu Yanan,Feng Jiamin,Meng Fanbin
Fabrics have attracted significant attention in the field of electromagnetic shielding due to their unique grid structure, high electrical conductivity, and flexibility. To enrich the research of textiles for microwave absorption, two-dimensional transition metal carbide (MXene)-enhanced reduced graphene oxide-based fabrics (MXene/RGO fabrics) were synthesized in this paper by using wet spinning–ionic cross-linking–chemical reduction strategy. MXene/RGO fabrics achieve a minimum reflection loss of − 58.3 dB at 17.6 GHz and a thickness of 2.4 mm, with an effective absorption bandwidth of 4.92 GHz. In addition, the combination of electromagnetic finite element simulation technology and test results was used to further elucidate the response mode and loss mechanism of MXene/RGO fabrics. The MXene/RGO composite fibers exhibit a tuned attenuation ability and impedance matching performance, which is attributed to the increased polarization relaxation loss caused by the large number of heterogeneous interfaces between RGO, MXene, and TiO 2 particles, as well as the appropriate electrical conductivity (16.6 S/cm). MXene/RGO fibers exhibit excellent microwave absorption performance, mechanical strength (534 MPa), easy modification, and fatigue resistance, promising stable absorption of electromagnetic waves in complex environments, thereby expanding the application scenarios of fabrics in the field of microwave absorption. Graphical
研究领域:
材料科学
·
电磁学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Haonan Zheng,Xiaohui Lv,Yueyue Zhang,Yongjun Men
Thermosensitive hydrogels are lauded for their smart and tunable responsive behavior, presenting critical application potential in biomedicine and sensing technologies. Traditional thermo-responsive polymers, such as poly( N -isopropylacrylamide) (PNIPAM), typically manifest subpar electrical conductivity , which hinders their integration into biosensing applications. PTPSS hydrogel distinctively responses to temperature and repeatably endures large volume water flux under temperature changes, while catering a significant conductivity (7.438 mS cm −1 ). However, it possesses suboptimal mechanical strength . In this research, we enhanced the mechanical strength of PTPSS hydrogel by copolymerization of AAm, obtaining a 22-fold increase in compression yield stress and a yield strain reaching up to 75 % The copolymerized hydrogel showcases an elevated transmittance ranging from 86.3–97.1 % within the visible light wavelength spectrum, with the copolymerized hydrogel's conductivity being about 188 times that of PNIPAM copolymerized hydrogel at identical monomer proportions. Simultaneously, the hydrogel maintains explicit thermosensitivity even at a TPSS ratio as low as 60 wt% (grounded on the overall monomer sum). The introduction of AAm copolymerization awards PTPSS with robust mechanical properties, profound transparency, and striking thermosensitivity alongside high conductivity, endorsing enormous potential in the realm of intelligent sensing.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Zhan Chao,Lu Qingchen,Jiang Haoyu,Lu Huidan,Liu Yongping
Silica aerogel, renowned for its ultra-low thermal conductivity, holds significantpotential as an advanced thermal insulation material. However, its practical application is hindered by limitations in strength and mechanical properties, particularly under harsh, high-temperature conditions, which compromise both mechanical resilience and insulation. To mitigate this, we synthesized silica nanofibers via electrostatic spinning and subsequently crafted thermally and mechanically robust cellulose fiber/silica nanofiber aerogel composites through freeze-drying. The resulting aerogel demonstrates remarkable physical properties: an ultra-lightweight bulk density of 1.3 mg/cm³, low thermal conductivity (47 mW·m⁻¹·K⁻¹ at 1000 °C), and high resilience. The internal fiber network is densely cross-linked, enhancing collapse resistance, structural stability, and rigid support. Mechanical testing revealed a high stress of 0.88 kPa at 80% compressive strain, which reached 1.02 kPa following 900 °C treatment. Thermal stability and insulation tests demonstrated the aerogel’s ability to withstand extreme temperatures (no combustion under a 1,300 °C flame) and maintain effective thermal insulation while retaining good recovery at 600 °C. These findings indicate that the novel aerogel composites surpass traditional ceramic fiber aerogel materials in mechanical and thermal insulation properties at high temperatures, presenting widespread application potential in extreme high-temperature environments.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Qi Ma,Lan Zeng,Xiaoyun Liu,Qixin Zhuang,Jun Qian
In this paper, large-sized covalent organic framework (COF) aerogels were prepared using high-efficiency catalysis under room temperature combined with rapid gel and freeze-drying methods for the first time. Two kinds of COF aerogels with rigid and semi-rigid building blocks were prepared using this method, having good mechanical strength (126 and 106 kPa), elasticity (aerogels structure remains intact after 10 cycles), thermal insulation properties (low thermal conductivity of 0.03 wm −1 K −1 ), low dielectric constant (1 kHz of 1.21 and 1.51), thermal stability and solvent stability, and ultra-light characteristics (densities of 0.029 and 0.040 g cm −3 ). Compared to the traditional COF methods that generally result in small particles, the high-efficiency catalysis method developed in this paper can be used to prepare large-sized COF aerogels under mild reaction temperatures and within less time conducive to industrial production. This method is expected to greatly broaden the application field and application scope of COF materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shihao Fu,Chang Sun,Lixin Han,Zhiqiang Li,Shuai Guo,Guangbin Li,Zhu Long
High-performance thermal insulation is critically needed in applications where heat transfer must be substantially minimized. Traditional insulating materials, whether organic or inorganic, often suffer from thermal instability or mechanical fragility. Herein, we introduce a series of lightweight, highly porous polyimide/aluminum oxide cluster (PI/AlOC) composite aerogels that exhibit superior thermal insulation properties, achieved through freeze-drying and thermal imidization processes. The aluminum oxide clusters serve as cross-linking agents, enhancing the interaction between polyimide molecular chains and endowing the composite with improved structural integrity and mechanical robustness, as evidenced by a compression modulus of 8.7 MPa, six-fold greater than that of pure PI aerogels. Moreover, the high porosity, reduced pore size, and three-dimensional network structure of the PI/AlOC composite aerogel confer exceptional thermal insulation performance, particularly at elevated temperatures, surpassing that of commercial thermal insulation materials. Thus, the PI/AlOC composite aerogels, with their high mechanical strength and outstanding thermal insulation, are promising for practical applications in thermal insulation.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Minjie Hou,Hui Xu,Xu Li
Lightweight and robust foams with multifunctionality are highly desirable to meet the demands of resource conservation and the development of an environmentally friendly society. Here, we demonstrate a sustainable and recyclable composite foam made from abundant resources of kapok cellulose and graphene as raw materials, produced through ionic (Cu 2+ ) crosslinking and directional freezing techniques. The resulting composite foam exhibits a low density of 18.6 mg cm −3 , a high compression modulus of 12.5 MPa, and exceptional thermal insulation performance of 0.02 W m −1 K −1 . An interpenetrating network formed through the chelating effect of Cu 2+ and physical crosslinking within the foam provides excellent wet stability and flame self-extinguishing ability, all while ensuring remarkable recyclability (the Young's modulus retains 96 % of its original foam after five recycling cycles). Additionally, the ice templating enhances the alignment of graphene nanoplatelets, resulting in pronounced anisotropic properties in mechanical strength, thermal conductivity, and electromagnetic shielding. This unique pore structure boosts its potential for use in photothermal water evaporation devices, achieving a water evaporation rate of 1.91 kg·m −2 h −1 and an evaporation efficiency of 80.5 % under 1.0 sun irradiation. This innovative method represents a significant breakthrough in the development of sustainable, high-performance foams, thus broadening their potential applications.
研究领域:
材料科学
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）