INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Tingting Lian,Shengchang Zhang,Qibin Xu,Kaixiang Wang,Bo Li,Xiangpu Qin,Mengjin Jiang,Pengqing Liu
The sustainability of epoxy thermosets (EPs) and EP-based composites is always limited by the evolution of internal microcracks and flammability. Herein, inspired by the drug release-delivery system for disease treatment, these symptoms of EP are solved efficiently by a multifunctional Diels–Alder (DA) release-delivery system. First, this novel system is fabricated by the cyclization reaction between the furan diene-containing phosphorus derivative and the maleimide dienophile. The resultant DA system is linked to the epoxy resin by the grafting reaction, thus ensuring its uniform dispersion. Being faced with the formation of inner microcracks, the maleimide dienophiles were released from the DA adducts under the mediated action of temperature and then were delivered to the targeted microcracks under the chemical potential difference derived from the variation of free volume. Then, the released maleimide molecules re-connect with the furan groups that existed near the microcracks to complete the repairing of the EP matrix. The skeletal structure of the EP was well preserved throughout the restoration process. Satisfactory flexural strength (105.5 MPa) and excellent crack-healing efficiency (104.5%) can be obtained for the modified EP. After three constant strain cycles, the stress retention rate can be readily maintained (more than 75%). In addition, due to the phosphorus–nitrogen synergistic flame-retardant effect from the DA system, not only the limited oxygen index of the DA-modified EP matrix can be improved to 27.5% but the lower peak release rate and lower total heat release are also observed compared with the unmodified EP.
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
LIQUID CRYSTALS
·
2023
·
IF 2.2
Yongxing Guo,Jinghua Zhao,Yi Li,Wei Liu,Yonggang Yang
Polymer-stabilised cholesteric liquid crystal (PSCLC) films attracted much attention in decoration and anti-counterfeiting. Herein, the PSCLC films were prepared using the mixtures of epoxy monomers through cationic photopolymerisation. The structural colour was tunable by changing the concentration of chiral dopant in the reaction mixture and polymerisation temperature. Due to polymerisation shrinkage, microcracks were formed at the surfaces of the PSCLC films, which originated from the oily streak defects of the CLC mixtures. Colourful patterns were prepared by controlling the polymerisation temperature. In addition, since light can leak out through the microcracks, the tetraphenylethylene-doped patterns can be applied in anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qian Ma,Anze Shui,Hulei Yu
The thermal shock behaviors of the multiple crack system based on aluminum titanate (Al 2 TiO 5 , AT) flexible ceramics are investigated. Two (fine/coarse-grained) systems are employed in this study to observe the influence of the grain size and microcrack size on the thermal shock behaviors of AT flexible ceramics. The findings reveal that these two systems exhibit markedly different adversarial strategies against high-temperature thermal shock. The coarse-grained system disperses the thermal stress by introducing new cracks and making stress evenly dispersed, while the fine-grained one can only concentrate thermal stress on limited microcracks. This is because almost all the grain boundaries in the coarse-grained system could serve as crack source sites, while that was only approximately 1/3 in the fine-grained one. Consequently, as the thermal shock temperature increases, the strain of the coarse-grained system first increases and then decreases, while its strength shows double peaks and double valleys. As for the fine-grained one, the strain decreases with the temperature increase, while its strength first increases and then decreases. Therefore, it can be concluded that the mechanical properties of AT flexible ceramics are closely related to microcracks' size and stress state. And, the conclusion that there exists a favorable state of internal stress and a favorable influence of microcracks that is beneficial to the mechanical performance of AT flexible ceramics could be drawn.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 45
·e53021
·
IF 3.057
Mingzhe Li,Bin Cao,Ruiqi Shang,Hongwei Mei,Liming Wang
Silicone rubber is used as an antipollution flashover material in outdoor insulation, which is susceptible to aging and has a shorter service life than other candidates. Microcracks are a common aging phenomenon that are difficult to be detected and repaired. The microcapsule self-healing technology can be used to repair microcracks and extend the service life of silicone rubber. This study considers hydrogen silicone oil as a representative of the polydimethylsiloxane healing agent system. Poly(urea–formaldehyde) microcapsules containing the hydrogen silicone oil are synthesized by in situ polymerization. The effects of the emulsifier concentration, initial pH value, initial ratio of the core–shell material, and sodium chloride (NaCl) concentration on the synthesis are investigated. Accordingly, the properties of the microcapsules before and after long-term storage are analyzed. The results demonstrate that microcapsules synthesized using poly(ethylene-alt-maleic anhydride) (EMA)+ polyvinyl alcohol (PVA) as the emulsifier have satisfactory morphology and performance, where the best synthesis conditions are 0.13 wt% EMA, 0.05 wt% PVA, initial ratio of the core–shell material of 1.5:1–2.0:1, initial pH value of 3.5–4.0, and 2 wt% NaCl. In long-term storage, the core material is well protected by the shell material. The synthesized microcapsule can serve as a material in the self-healing system of silicone rubber.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xinru Tan,Maolin Zhang,Dongyan Zhang,Yangxi Yan,Yuan Wang,Zhimin Li
The formation of micro-cracks in Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode particles is an extremely important factor affecting the electrochemical characteristics after long-term cycling. Generally, cracks can be divided into intergranular crack and intracrystalline crack according to their positions. Coating has been confirmed as a highly effective strategy to relieve intergranular cracks. However, the intracrystalline cracks of primary-like particles have rarely been studied. In this work, ethoxy functional polysiloxane (EPS) was directly coated on the surface of original NCM811 by tetraethyl orthosilicate (TEOS) hydrolytic polycondensation method without any additives. Then, the microstructure, micromorphology, surface state and electrochemical properties were investigated in detail by XRD , SEM, TEM, CV and EIS . The results displayed that the micro-cracks of primary-like particles were effectively suppressed under appropriate EPS coating. Accordingly, excellent capacity retention of 95.6% (100 cycles, 1C) and rate performance (144.6 mA h/g, 5C) were obtained. These improved mechanical and electrochemical properties are considered to be related to the EPS stress buffer layer , suppressed oxygen vacancies , inhibited phase transition and reduced volume change.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Weiting Sheng,Xiaoyun Bi,Zhaoyan Huang,Liangzhang Tang,Honghan Sun,Zhibo Cao,Can Jiang
Strain sensors based on crack-sensitive structures have gained attention for their exceptional sensitivity. However, the geometry of the crack structures significantly impacts the balance between sensitivity and strain range, while the controllable formation of such cracks remains a challenge, often leading to performance variations. Herein, we developed an ultrasensitive strain sensor using a mesh-like polymer-mediated electroless plating (MPMEP) strategy to construct controlled nickel microcrack structures on natural rubber (NR). Poly(acrylic acid) brushes grafted via surface-initiated ATRP on NR served as interfacial layers, ensuring consistent crack morphology. The sensor achieved a high gauge factor of 417, a wide strain range of 50 %, and rapid response/recovery times (46/58 ms), with stable performance over 10,000 cycles. Compared to existing technologies, our MPMEP strategy uniquely combines high sensitivity with scalability. Moreover, its robustness and flexibility position it for wearable applications, including real-time human motion monitoring and health management. This work addresses long-standing challenges in crack-based strain sensors, presenting a reproducible and scalable platform for next-generation flexible electronics.
研究领域:
材料科学
·
柔性电子
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2022
·Vol. 4
·期 6
·1681-1693
·
IF 5.598
Pengdong Feng,Yi Zheng,Kang Li,Weiwei Zhao
The development of a strain sensor that can detect tensile strains exceeding 800% has been challenging. The non-conductive stretchable Eco-flex tape has been widely used in strain sensors due to its high elastic limit. In this work, an Eco-flex-based strain sensor that was conductive until occurrence of fracture was developed. The silver nanoparticles and carbon nanotubes constituted stretchable conductive paths in the Eco-flex matrix. The maximum tensile strain of this sensor was 867%, and the resistance change rate was higher than 104, while the strain resolution was 7.9%. Moreover, the sensor is characterized by segmented logarithmic linearity. This excellent performance was attributed to the ginkgo-like pattern, the patterned strain-coordinating architecture (PSCL), and specific nanocomposites with micro-cracks. The deformation of the architecture and the evolution of the microcracks were studied. In addition, the application of this strain sensor on a wing-shaped aircraft was proposed and its feasibility was demonstrated.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Fuping Li,Wei Zheng,Yue Wang,Wei Dang,Zhuoli Xu,Xinyuan Zhang,Kang Zhao,Zhenyi Yuan,Yufei Tang
Polycarbosilane-derived (PCS-derived) coating containing SiC fillers with enhanced adhesive strength and corrosion resistance were fabricated on Q235 steel by a simple method of dip coating . The effects of content and particle size of SiC fillers on the phase composition, surface morphology , adhesive strength and corrosion resistance of PCS-derived coatings were studied. Addition of SiC fillers could reduce the microcrack width on the coating surface . The microcrack width decreases with the decrease in particle size of SiC fillers. Addition of 2.5 wt% SiC fillers with particle size of 30 nm could make the coating surface crack-free. Different from particle size, the effect of filler content on the microcracks has a moderate value which is corresponding to lower microcrack width. In addition to the microcracks, SiC filler content and particle size have significant effects on the adhesive strength between coatings and substrates. The higher adhesive strength is 319.1 MPa for coatings fabricated with a particle size of 500 nm and a content of 10 wt%. SiC fillers can improve the corrosion resistance of the PCS-derived coatings. In comparison with particle size of filler, filler content has a greater effect on the corrosion resistance of the coatings. The corrosion mechanism was analyzed. Appropriate content of fillers reduce the microcrack width and further improve the corrosion resistance of the coatings.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Fenglei Zhang,Dongdong Han,Ning Xu,Xing Cui,Lei Zhang
Epoxy asphalt, a thermosetting polymer, is characterized by stable, irreversible internal chemical bonds that prevent recovery and spontaneous micro-crack healing, unlike conventional asphalt. This study introduces a renewable nano-modifier synthesized via esterification of carboxyl-functionalized carbon nanotubes (CNTs-COOH) and furfuryl alcohol (FA), termed CNTs-FA. The successful synthesis of CNTs-FA was confirmed through various microscopic techniques. Integrating CNTs-FA into epoxy asphalt materials, the optimal dosage was identified as 0.05% of the total epoxy asphalt mass using tensile tests and fluorescence microscopy. Thermal reversible effects and mechanisms were further analyzed through multiple regeneration cycles using tensile properties, fluorescence microscopy, and infrared spectroscopy. The study elucidates that the thermal reversibility in epoxy asphalt is facilitated by the Diels-Alder (DA) reaction between the conjugated diene structure in FA and the curing agent oleylamine. This research provides an effective solution to the non-recoverability and unrepairable micro-cracks of traditional epoxy asphalt mixtures. Highlights CNTs-FA was successfully prepared by esterification reaction. Using nano modification methods, introduce DA reaction into curing system. Renewable function of epoxy asphalt by DA reversible reaction.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Jinzheng Yang,Yanling Xu,Yangyang Song,Gongkai Wang,Fuxing Yin,Haitao Liu,Wenjing Yuan
Fiber-based architectures exhibit remarkable advantages in wearable electronics. Despite the various techniques to achieve strain sensitive fibers, important factors concerning the sensing performance, e.g. fiber arrangement, have been rarely explored. Herein, various fiber sensing patterns with anisotropic and isotropic microstructures were fabricated, and their localized strain distribution and conductive pathway configuration were tailored through fiber alignment. The sensing performance and mechanisms were investigated based on experimental characterization and theoretical modeling. We find out that the fibers arrangement strongly determines their strain sensitive behavior including sensitivity and sensing range. Additionally, by introducing a mechanical-guided step to realize a constant microcrack density in the fiber patterns, strain sensitivity and stability can be further improved. As a proof of concept, we integrated two fiber array sensors into a strain sensing system to simultaneously achieve an ultrahigh sensitivity (gauge factor up to 9540) and a wide sensing range (0.01–110%) as well as fast response.
研究领域:
材料科学
·
电子工程
·
传感器技术
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Chong Bai,Kang Ji,Shuxuan Feng,Jiaxue Zhang,Desheng Kong
Stretchable batteries are indispensable energy storage devices to power emerging wearable electronics in soft form factors. In contrast to commonly employed engineering approaches to mitigate strains through structural design, the intrinsically stretchable devices naturally exhibit skin-like mechanical deformability by using all compliant building components. Currently, the intrinsically stretchable battery often shows a significant trade-off between electrochemical performances and mechanical deformability. Here, we introduce a low-cost and scalable approach to create an intrinsically stretchable aqueous battery featuring the deployment of state-of-art battery materials and binders. The compliant current collector, in the form of a bilayer silver nanowire/carbon nanotube nanocomposites, demonstrates excellent mechanical stretchability and electrochemical stability. The microcracked electrode layer retains stable charge transport and excellent electrochemical activity under large mechanical deformations through firm attachment to the bilayer current collector. A stretchable Zn-MnO 2 cell in a sandwiched configuration is assembled exhibiting high specific capacity (>200 mAh g −1 at 100 mA g −1 ), excellent capacity retention of ∼90% over 100 cycles, large stretchability up to 100% strain, and durability against repetitive mechanical deformations. The practical suitability is demonstrated by a stand-alone electronic system conformably mounted on the wrist, in which an LED array is powered by a pair of stretchable Zn-MnO 2 batteries.
研究领域:
材料科学
·
能源存储
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Chun-Ping Li,Ya-Qi Wu,Li-Xin Gao,Da-Quan Zhang,Zhong-Xun An
The binder-free electrode materials have excellent practical application value, especially for carbon-based electrodes. As a naturally occurring carbon precursor, lignin can be developed for the electrode material of capacitive deionization with high energy storage and high adsorption performance. In this paper, nanofibers containing mesoporous fracture systems are prepared by depolymerized lignin. The microcracks are uniformly distributed on the carbon nanofiber tube bundles. It can provide a favorable place for ion storage , and the notches structure further improves the ion adsorption performance. This study provides a simple and efficient strategy for the converting lignin into carbon fibers with the micro-cracking structure. It is expected to promote the application of lignin-based carbon nanofibers in capacitive deionization.
研究领域:
材料科学
·
环境工程
✓ 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）