MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 13
·2300097
·
IF 4.6
Yayuan Liu,Fuyue Tian,Jing Hu,Nanying Ning,Bing Yu,Ming Tian
Intelligent fluorescent coatings have received widespread attention in the encryption technique field such as anti-counterfeit, while the traditional fluorescent coatings are easy to be damaged by external force. In this study, the fluorescent and self-healing anti-counterfeit coatings are prepared after rational molecular design. Two polymers containing fluorescent groups, including polyurethane containing the anthracene (AN) side group and polyimide containing the naphthalenediimide (NDI) structure are synthesized to realize multiple color changes with fluorescence through simply blending. Due to the overlapping fluorescence spectra of the groups, enabling the fluorescence resonance energy transfer effect (FRET), the coating with different group ratios exhibits tunable fluorescence under the same excitation light, providing diverse patterns. Moreover, due to the reversible photo-crosslinking and thermal de-dimerization properties of anthracene, the recording, erasure, and rewriting of the surface pattern can be realized, and the fluorescent anti-counterfeit coatings exhibit excellent self-healing properties after cross-linking due to the FRET effect, which solves the problem of poor healing and ensures the stability and integrity. The fluorescent coating with cross-linked structure and self-healing behavior based on the FRET effect greatly expands the functional applications of traditional polyurethane materials.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Chenyu Wang,Shuru Wu,Jingzheng Weng
As a prospective and efficient strategy to address the volume expansion of the Si nanoparticles , the binder plays an increasingly significant role in the Si anode of lithium-ion batteries. Based on the inspiration of natural physics and cross-linked networks, a functional (named polyacrylic acid-citric acid-polyethyleneimine) binder that is similar to a flexible polymer skeleton integrated with a tough framework and efficient self-healing behavior is designed to achieve long cycling stability for Si anodes. The cross-linked network can be stabilized by the amide bonds, formed by polyethyleneimine (PEI) and polyacrylic acid (PAA). Based on this, citric acid (CA) can be added to form multiple hydrogen bonds, whose carboxyl groups can also establish a more reversible cross-linked network with Si particles . Then, PEI and CA molecules can connect with PAA to form a “rigid and flexible” structure. The expansion stress of Si nanoparticles is relieved by the protective buffer layer built by the addition of PEI and CA molecules. In addition, PAA, PEI, and CA work together to solve the problem that the action of CA and PAA alone cannot perform well under large currents. Hence, this water-based binder with a three-dimensional cross-linked network structure with self-healing ability has better performance during cycling: at a current density of 0.2C, it still has a capacity of 2017.4 mAh·g −1 after 200 cycles, with a capacity retention rate of 80.7 % (1745.3 mAh·g −1 , 300 cycles, a capacity retention of 74.9 %).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Fanqing Meng,Wei Ma,Chunying Duan,Xin Liu,Zhen Chen,Moyan Wang,Jian Gao,Zhe Zhang
Two dimensional transition metal dichalcogenides as potential catalysts to solve energy and environmental crises have caused significant research interests in recent years. In this work, edge-selectively Fe@3D-WS 2 nanoflowers with the abundant single-layer were efficiently prepared by dry ball milling for levofloxacin (LEVO) elimination. Together with the advantages of the single-layer active edges and the stretch of W S bond, the as-prepared Fe@3D-WS 2 showed the ultra-high degradation efficiency for LEVO under ball-milling condition. This high degradation activity was demonstrated to be originated from piezo-catalysis, rather than adsorption or thermocatalysis. In addition, the Fe@3D-WS 2 also showed an ultra-high reusability during the cyclic tests, which is due to its special “self-renewing” behavior under ball milling condition. The degradation efficiency of the Fe@3D-WS 2 still reached ˜ 99% after ten cyclic tests. Both oxygen radicals ( 1 O 2 , O 2 ·− ) and ·OH radicals were generated and took part in the LEVO degradation, while oxygen radicals were more contributed to the LEVO degradation. The present work not only provides an important insight for designing efficient catalysts, but also extends the possible application areas of ball milling technique.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2022
·
IF 4.695
Qipeng Huang,Xiaoliang Shi,Yawen Xue,Kaipeng Zhang,Chaohua Wu
The wear fatigue of slewing bearings at the contact areas of raceways (AISI 4140 steel (AS)) and rollers (AISI 52100 steel) seriously reduces the service life of equipment. AS-SnAgCu-TiC composites (AS-SACT) were prepared by filling multi-solid lubricants into surface biomimetic textures of AS to improve the wear resistance. Tribological properties were tested using a block-on-ring tribometer. The materials of block and ring were AS and AISI 52100 steel, respectively. Compared with that of AS, coefficient of friction of AS-SACT was decreased by 67.93%, and wear height was reduced by 42.19%. Wear triggered the diffusion of SnAgCu from the bionic textures to worn surface. The hard phase of nano-TiC was wrapped by a cluster of multi-layer lubricants to form spherical particles, which not only converted sliding to rolling contact, but also repaired pits and furrows on worn surface. Hence, AS-SACT with self-repairing behavior had excellent properties of antifriction and wear resistance.
研究领域:
材料科学
·
摩擦学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2018
·
IF 3.485
Libang Feng,Zhengyang Yu,Yaohui Bian,Yanping Wang,Yanhua Zhao,Liuxiaohui Gou
Materials can suffer from different damages in actual application. Consequently, diversified failure modes can be caused, while different failures may have unalike repairing effect. Thereupon, it is quite important of exploring the effect of failure modes on the repairing behavior of self-healing materials. Herein, a kind of thermoplastic polyurethane containing Diels-Alder bonds (PU-DA) has been synthesized successfully. Based on the dual actions of thermo-reversible Diels-Alder reaction and molecular movement, the as-prepared polyurethane exhibits excellent self-healing performance. The repairing behavior of polyurethanes with different failure modes has been investigated both qualitatively and quantitatively. Results show that polyurethanes with various cracks can be repaired. However, PU-DA film with shallower crack exhibits a high healing efficiency as compared to that with deeper crack at the similar heat treatment. Meanwhile, polyurethane has multiple healing capability and cracks can be caused and repaired repeatedly. Additionally, PU-DA fragments can recombine together as a whole even after destroyed by tearing, indicating PU-DA also exhibits outstanding reprocessing capability. The research can lay foundation for realizing the favorable repairing of various failure modes, and further promote self-healing materials and technology applied into practice.
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
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Jiaofeng Ye,Haocheng Liu,Danbin Zhu,Chenyang Guo,Yanhua Liu,Libang Feng
A self-healing polyurethane with five-fold response to thermal, near-infrared light, microwave, sunlight and UV light is prepared by introducing amino-functionalized copper sulfide (CuS-NH 2 ) nanoparticles into thermally reversible polyurethane containing both Diels-Alder and disulfide bonds. The prepared polyurethane exhibits optimal comprehensive mechanical properties and self-healing performance when the addition amount of CuS-NH 2 is 0.3 wt%. The polyurethane with quite high tensile strength (14.3 MPa), hardness (75 HA), elongation at break (625 %), and toughness (24.85 MJ/m 3 ) can be obtained. Cracks in the modified polyurethane can be self-healed repeatedly through heat-treated at 120 °C for 6 min, or irradiated with 4 W/m 2 of near infrared light at a wavelength of 808 nm for 60 s, or treated under a 250 W microwave for 80 s, and followed by a heat treatment for 12 h at 60 °C. More importantly, the damaged sample can also be repaired multiply after being treated to simulated sunlight or irradiated with 250–380 nm UV light for 6 h. Results show that the quickest self-healing speed and highest repair efficiency can be resulted when the materials are exposed to near-infrared light. The self-healing behavior is achieved through the cooperation of thermo-reversible Diels-Alder reaction, disulfide bonds exchange, dissociation and regeneration of hydrogen bonds, directional migration of CuS-NH 2 nanoparticles. These findings give important implication for the development of multi-responsive self-healing materials with efficient self-healing capability. Meanwhile, it provides various ideal selections for damage repair under different environments.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jiyu Sun,Wen Li,Yuchao Zhan,Limei Tian,Hongli Tian
Coatings provide a protective mechanism to help prevent metal corrosion. However, once a coating breaks down, its corrosion protection is greatly reduced. The incorporation of self-healing microcapsules in the coating can substantially improve the service life of metallic materials. For large-area engineering applications of microencapsulated, intelligent, self-healing anti-corrosion coatings, two different coating processes for poly (calcium alginate) microcapsules loaded with tung oil epoxy resin-based self-healing coatings (self-levelling and electrostatic spraying processes) are explored in this paper. In this paper, the poly (calcium alginate) microcapsules loaded with tung oil were synthesized by the emulsion gelation method. The microcapsules and its self-healing behaviour was analysed by SEM and FTIR. The anti-corrosion behaviour of the coatings were studied by polarization curves, EIS and SEM.The effects of different coating proportion schemes and coating processes on the corrosion resistance of the coatings are discussed. In conclusion, This work confirms the influence of coating preparation process on coating properties, which is of great significance for coating technology and application.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yuting Zou,Lingyu Li,Bin Tan,Yue Ma,Liang Fang,Chunhua Lu,Zhongzi Xu
Self-healing behavior of polymer coatings consists of two steps: crack closure and crack repair. Shape-memory effect, conformational transition of polymer chains, and water-induced flowability were reported on crack closure as the preliminary and necessary step. All of them, however, cannot achieve the trade-off between healing from wide damage and satisfied properties. Here, we prepared silane modified epoxy coatings, which achieved the self-healing of cracks with width of 300 μm upon heating and good mechanical properties. Furfurylamine (FA) and furfuryl glycidyl ether (FGE) were reacted with diglycidylether of bisphenol A to prepare oligomers with furan groups as side and terminal groups, which created reversible crosslinking bonds based on Diels-Alder reactions with maleimide groups from bis(4-maleimidophenyl)methane. (3-aminopropyl)triethoxysilane (APTES) was also involved to reduce the surface tension of coatings and to offer irreversible crosslinking bonds that ensured the coating stability during heating. We fully studied the effects of the ratio of APTES and FA (1:9, 2:8, 3:7, and 4:6) on the chemical structures, molecular weight, and thermal properties of oligomers, as well as the chemical structures, surface structures, mechanical properties of coating materials. By increasing the ratio of APTES and FA, the surface tension of the coating was gradually decreased until a critical ratio of 3:7. All coatings possessed similar and good mechanical properties. The self-healing behaviors were found to be dominated by the competition among shape-memory effect, surface tension driven flow, and viscosity, which were related to coating network structures. Thick coatings also facilitated the crack closure and healing performance. Compared with the coating without silane modification, the self-healing behavior was improved, the mechanical properties were maintained, and the anti-corrosion properties were deteriorated.
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
MACROMOLECULES
·
2022
·
IF 6.057
Jialiang Chen,Chichao Li,Huan Jia,Zhihua Shen,Rong Zhao,Tao Su,Bo Xiang,Xiujuan Wang,Danil W. Boukhvalov,Zhenyang Luo,Yanlong Luo
A larger number of studies successfully prepared various polymer materials with excellent self-healing properties, but the study on the underlying self-healing mechanism remains comparably backward and still unclear. In this study, we prepared a self-healing polyurethane-urea (PUU) elastomer based on noncovalent bonds. Then, a coarse-grained model of PUU was successfully constructed using the iteration Boltzmann inversion (IBI) method. Microphase separation and mechanical properties of PUU were reproduced using this model by coarse-grained molecular dynamics (MD) simulation. The three-stage healing mechanism comprised the following: (1) movement of the material to close the gap, (2) interdiffusion of the polymer, and (3) bond exchange. The mechanism was revealed by determining the effects of hard segment content on the microstructure (chain entanglement, interactions of soft and hard segments, chain motility) and healing capacity over healing time. In the initial stage of healing, the polymer chains were disentangled, and the degree of entanglement of the healed samples decreased. A novel experimental strategy confirmed the transition of hydrogen bonds from disorder to order during the healing process. The motility of the cut polymer chains (low molecular weight), especially the cut soft segment, and the disordered hydrogen bonds played a key role in the healing capacity. The increased content of the ordered hydrogen bonds led to the formation of a hard segment network, which was not conducive to healing. Finally, the promoting mechanism of external factors, such as heating and trace amount of solvent, on the healing of PUU was explained. Our work systematically and profoundly reveals the self-healing behavior and mechanism of microphase-separated PUU at the molecular level.
研究领域:
材料科学
·
分子生物学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huawen Liu,Yaozong Li,Mengnan Zhou,Bichi Chen,Yilin Chen,Wentao Zhai
Flexible piezoresistive sensors show broad application value in wearable electronic skin, health monitoring and motion detection. The practical range of conventional piezoresistive sensors, however, is often severely limited by their sensitivity, measuring span, mechanical properties, and lateral expansion caused by positive Poisson's ratio (PPR) effects. Herein we introduce a generally applicable methodology, ambilateral convergent directional freeze casting technique, for the fabrication of anisotropic porous foams with a negative Poisson's ratio (NPR). Different from traditional freeze casting technique, this new design methodology enables precise control of pore types and pore orientations, thereby endowing artificial materials with special mechanical properties. Under uniaxial compression, synthetic foams exhibit macroscopic lateral shrinkage, with a Poisson's ratio below – 4.2% at the strain of 25%. These conductive meta -structured foams are used to construct piezoresistive sensors. Compared with traditional structures, metastructures with NPR effects significantly increase the number of wall-to-wall contacts and the formation of electrical paths, thereby enhancing the sensitivity and sensing reliability of sensors. In addition, the NPR effect markedly enhances the mechanical elasticity and compression resistance of sensors, enabling it to have excellent signal stability even in the face of reiterative compressions. These meta -structured sensors also exhibited smart resistivity repair behavior in the face of overload damage. Integrated sensors can be used for monitoring of pressure distribution and athlete's gait. Lateral contractions caused by NPR effects can avoid the contact of adjacent sensors and narrow the gap between two sensors, thus improving sensing stability and pressure distribution resolution of distributed sensors.
研究领域:
材料科学
·
传感器技术
·
力学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Li Cheng,Chengbao Liu,Hao Wu,Haichao Zhao,Liping Wang
Embedding two-dimension micro/nanocontainers containing corrosion inhibitors into organic coating is a well-established concept to impart the coating with enhanced barrier and self-healing feature. Herein, a versatile nanoemulsion assembly approach was used to synthesis nanocarriers combing mesoporous polydopamine nanoparticles (MPDA) with reduced graphene oxide (GO), which was employed to encapsulate corrosion inhibitors (benzotriazole, BTA) to improve the anticorrosion performance of waterborne epoxy coating. The BTA release profiles from synthesized GO with MPDA (PDAG) demonstrated the rapid pH-triggered activities to acidic corrosion environment. With the addition of BTA-loaded PDAG, the composited epoxy coatings presented self-repairing behavior and enhanced corrosion resistance during long-term immersion. The outstanding anticorrosion performance is attributed to dual-protection mechanism provided by BTA-loaded PDAG: (1) MPDA endows GO with satisfactory interface compatibilities and thus provides impermeable barrier to delay the penetration process of corrosive electrolyte; (2) corrosion inhibitors including BTA and polydopamine form the adsorption layers on bare steel surface to resist continuous corrosion at metal/coating interface.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）