CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuye Zhu,Min Chen,Limin Wu
Polymeric coatings are usually threatened by some harsh environment factors, which induce the formation of cracks or loss of functional components. Traditional extrinsic self-healing coatings usually have only one single repair mode (crack-repairing or function-restoring mode) that may not be powerful enough to meet the complex repair needs in practical applications. Herein, we first report a UV-responsive, dual-functional, fully-utilized microsphere-based system for highly efficient self-healing coatings, in which the UV-reversible coumarin crosslinking shells can not only encapsulate and release functional compounds as the function-repairing agents, but also participate in self-healing process as the crack-repairing agents, thus realizing two modes of repair with 100% of utilization efficiency of microspheres.
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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jialiang Li,Yinghu Song,Guojun Song,Zhaoji Li,Xirui Yang,Shuang Yin,Xiaoru Li
The preparation of polyurethane (PU) materials with both low-temperature rapid repair and robust mechanical properties still remains a challenging yet promising endeavor. Herein, a multifunctional linear PU supramolecular elastomer was successfully synthesized, incorporating multiple hydrogen bonds and coordination bonds to endow it with self-healing properties. The results demonstrated that the self-healing PU exhibited strong tensile strength (∼30 MPa), high elongation at break (∼925%), and excellent toughness (∼112 MJ/m3) through synergistic effect of hydrogen bonds and metal coordination bonds. After 12 h of repair at 45 °C, the repair efficiency of the PU film reaches 87%. The self-repairing PU film also possesses excellent transparency with a transmittance exceeding 90%. Furthermore, the PU film demonstrates good recyclability; even after multiple recycling and reshaping, its mechanical properties do not show a significant decrease. Therefore, the development of self-healing PU with low-temperature capabilities holds significant theoretical implications, practical value, and broad application prospects. These materials are expected to find wide-ranging applications in various fields in the future.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 28
·期 4
·373-381
·
IF 1.758
Wu Xudong,Huang Jingyu,Yu Shuhui,Ruan Panpan,Sun Rong,Wong Ching-Ping
Dielectric materials with self-healing property after the occurrence of detrimental events such as tearing or scratch are highly desired, which guarantees reliability and lifetime of the electric and electronic systems. Here, a self-healing covalently bonded titanium dioxide/polyurethane (TiO 2 /PU) nanocomposite with enhanced dielectric constant was prepared by in-situ polymerization based upon Diels-Alder reaction. The PU prepolymer was prepared from TiO 2 , poly(tetramethylene glycol) and 4,4-diphenylmethane diisocyanate. Then the linking between the prepolymer and Diels-Alder adducts of bifunctional maleimide blocked by furfuryl alcohol was carried out. The in-situ polymerization method allows the TiO 2 filler, the PU polymer matrix, and the DA healing portion to be tightly connected, resulting in a stable nanocomposite system. Due to the reversibility of covalent bonds, the TiO 2 /PU nanocomposites exhibited thermal self-healing properties after being cut. The dielectric constant and loss, mechanical properties can be effectively restored to their original state after damage.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Potao Sun,Wenxu Tang,Wenxia Sima,Chaolu Niu,Tao Yuan,Ming Yang,Qichang Liu,Zheng Fang,Ninglong Fu,Ze Yin
Microcapsule-based self-healing is an effective strategy for addressing multiscale damage in polymeric materials. However, conventional methods exhibit limited repair capabilities for large-scale damage (at the submillimeter level) under low microcapsule doping concentrations (<5 wt%). This study proposed a dual self-healing mechanism through the development of a double-shell microcapsule/modified epoxy resin composite (DMMEC). The topological reconstruction of the epoxy matrix was achieved by incorporating a 5-wt% terephthalaldehyde crosslinker, endowing the system with dynamic covalent adaptive network characteristics. Polyurethane/polyaniline (PU/PANI) double-shell microcapsules with photothermal conversion enabled infrared-triggered localized viscoelastic matrix flow, synergistically inducing damage propagation through minimal repair agent release. Notably, permittivity disparities at the microcapsule-matrix interface were found to guide the targeted development of micrometer-scale electrical tree damage, achieving efficient microscale electrical tree repair at a low doping concentration (2 wt%). Moreover, when subjected to large-scale mechanical scratch damage (2-mm length × 100-μm width), recovery rates of 91.3 % in mechanical strength and 90.4 % in electrical strength were attained. The proposed method overcomes the inherent trade-off between healing efficiency and matrix performance degradation in low-load microcapsule systems, thereby providing a novel paradigm for efficient multiscale damage restoration in polymeric materials.
研究领域:
材料科学
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高分子科学
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自修复材料
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纳米技术
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电气绝缘
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光热转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jiangpeng Li,Ying Ding,Kaili Wang,Ningqing Li,Guangren Qian,Yunfeng Xu,Jia Zhang
The use of humic acid (HA) and fulvic acid (FA) as reinforcing agents to improve the efficiency of electrokinetic remediation (EKR) were investigated for the first time using an artificially contaminated soil. A series of soil leaching tests and bench-scale EKR experiments were performed to elucidate the mechanisms of As removed from artificially contaminated soil. The characterization of total reducing capacity (TRC) and functional group were carried out to reveal the difference of HA and FA. The observations demonstrated that with 0.1 M NaOH and KCl as the anolyte, using both HA and FA enhanced the efficiency of EKR. After 25 days of EKR, the removal efficiency of TAs in HA/FA-enhanced EKR was about 2.0–3.0 times greater than when unenhanced. Compared to HA, more As was removed in EKR with FA, which has more TRC and oxygen-containing groups. These EKR experimental results, with the support of data obtained from soil leaching test, indicate that competitive adsorption, reductive dissolution and complexation were the reasons why HA and FA promoted the release of As in the soil and further enhanced the remediation efficiency.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Haojie Zhang,Xiongbo Dong,Huaming Yang
Rapid and efficient remediation of heavy metal-contaminated water and soil bodies has been a hot topic in ecological remediation. However, designing and synthesizing green remediation materials with fast kinetics and high adsorption capacity is still challenging. In this study, a novel heavy metal remediation material (Mt@ZrP) has been prepared using montmorillonite to induce the structural rearrangement of zirconium phosphate (ZrP). The results showed that montmorillonite could mediate the external electron distribution of ZrP , thus increasing its O 1 s binding energy. Distinct from the electrostatic adsorption of bare ZrP, Mt .@ZrP with higher orbital binding energy led to an extra adsorption mode with internal spherical coordination. Such characteristics dramatically shortened the adsorption equilibrium time (23 min) and enhanced the adsorption capacity (275.6 mg/g-ZrP) of Mt.@ZrP for Cd removal in comparison to those of bare ZrP (220 min, 196.1 mg/g-ZrP). As for soil remediation , Mt.@ZrP presented a faster Cd removal rate than bare ZrP. The residual fraction increased from 22.03% (control) to 28.47% (Mt@ZrP, 1 wt%) and 37.54% (Mt@ZrP, 3 wt%), which significantly decreased the biological efficacy of Cd in the soil. These findings could provide a novel strategy for the design and synthesis of excellent remediation materials for the rapid and efficient removal of heavy metals in water and soil.
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
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 8
·4344-4354
·
IF 12.732
LiangLiang Xia,HongJun Tu,Wen Zeng,XiaoLing Yang,Ming Zhou,Linkai Li,Xiao Guo
The preparation of room-temperature self-healing polymeric materials with good healing efficiency and high mechanical strength is challenging. Two processes are essential to realise the room-temperature self-healing of materials: (a) a non-crystallised structure and interpenetration and diffusion of polymer chains; (b) fast reorganisation of the intermolecular bonds at damaged sites. Using these strategies, a new polyurethane elastomer is prepared in this study via three-step polyadditions using polytetramethylene ether glycol, isophorone diisocyanate, 2,6-pyridinedimethanol, and 4,4′-methylene bis(2-chloroaniline). The prepared elastomer possesses excellent tensile strength (34.1 MPa), high toughness (127.3 MJ m−3), high fracture energy (119.1 kJ m−2), and good stretchability (2014%). Furthermore, it exhibits strain-induced strengthening behaviour and its mechanical performances are superior to those of previously reported room-temperature self-healing polymer materials. The polyurethane elastomer synthesised via optimized hierarchical H-bonding interactions ultimately exhibited a synchronous self-healing efficiency of more than 83% with tensile strength, elongation, and toughness at 25 °C ± 2 °C after self-healing for 48 h. This study offers beneficial insights into the preparation of room-temperature self-healing polymers with high mechanical strength.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Xuanru Li,Liuwei Wang,Bei Chen,Yuanyuan Xu,Huixia Wang,Fei Jin,Zhengtao Shen,Deyi Hou
Layered double hydroxides (LDH) show great promise for the remediation of heavy metals and metalloids in aqueous media and soils. In this study, we propose a green synthesis approach for LDH utilizing industrial waste granulated ground blast furnace slag (GGBS) and readily available magnesium oxide (MgO), and applied these green synthesized LDH for As and Cd remediation in both water and soil. The synthesized LDH were characterized via multiple approaches including SEM , HRTEM-EDS, TGA , XRD, and FTIR, demonstrating that the addition of 20% MgO in the raw materials (LDH b ) substantially improved the stability of LDH compared to LDH synthesized solely from pure GGBS (LDH a ). Batch adsorption experiments were conducted to evaluate the adsorption efficiency of LDH a and LDH b for Cd(II) and As( V ) under varying initial solution pH conditions . Results showed that as the pH increased, calcium leaching remained high while aluminum leaching gradually increased. The adsorption isotherms and kinetic studies further revealed that LDH b displayed better adsorption performance for As( V ) across different pH conditions, while both LDH showed a 100% removal rate of Cd(II) at pH ranging from 6 to 9. Both LDH a and LDH b exhibited promising immobilization effects on As and Cd in contaminated soils, with LDH a showing superior stabilization performance toward As, immobilizing 83.8% of bioavailable As in the farmland soil and 78.7% in the industrial site soil, compared to LDH b 's 54.8% and 50.6%, respectively. The findings of this study hold promise for the practical application of LDH as an efficient and environmentally friendly remediation material for contaminated water and soils containing toxic metal(loid)s.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 12
·4440
·
IF 3.4
Baolei Wang,Zewei Li,Xinru Liu,Lulu Li,Jianxiang Yu,Shuang Li,Gaiping Guo,Dahai Gao,Yuhua Dai
Intrinsic self-healing polymers via dynamic covalent bonds have been attracting extensive attention because of their repeatable self-healing property. Herein, a novel self-healing epoxy resin was synthesized with disulfide-containing curing agent via the condensation of dimethyl 3,3′-dithiodipropionate (DTPA) and polyether amine (PEA). Therefore, in the structure of cured resin, flexible molecular chains and disulfide bonds were imported into the cross-linked polymer networks for triggering self-healing performance. The self-healing reaction of cracked samples was realized under a mild condition (60 °C for 6 h). The distribution of flexible polymer segments, disulfide bonds and hydrogen bonds in cross-linked networks plays a great role in the self-healing process of prepared resins. The molar ratio of PEA and DTPA strongly affects the mechanical performance and self-healing property. Especially when that molar ratio of PEA to DTPA is 2, the cured self-healing resin sample showed great ultimate elongation (795%) and excellent healing efficiency (98%). The products can be used as an organic coating, in which the crack could self-repair during a limited time. The corrosion resistance of a typical cure coating sample has been testified by an immersion experiment and electrochemistry impedance spectrum (EIS). This work provided a simple and low-cost route to prepare a self-healing coating for prolonging the service life of conventional epoxy coatings.Keywords:self-healing polymer;epoxy resin;dynamic covalent bond;healing efficiency
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
WATER RESEARCH
·
2023
·
IF 12.8
Shiyu Cao,Guangming Zhan,Kai Wei,Biao Zhou,Hao Zhang,Tingjuan Gao,Lizhi Zhang
The mechanistic study of soil and groundwater remediation in petroleum contaminated lands significantly demands rapid qualitative and quantitative identification of petroleum substances. However, most traditional detection methods cannot provide the on-site or in-situ information of petroleum compositions and contents simultaneously even with multi-spot sampling and complex sample preparation. In this work, we developed a strategy for the on-site detection of petroleum compositions and in-situ monitoring of petroleum contents in soil and groundwater using dual-excitation Raman spectroscopy and microscopy. The detection time was 0.5 h for the Extraction-Raman spectroscopy method and one minute for the Fiber-Raman spectroscopy method. The limit of detection was 94 ppm for the soil samples and 0.46 ppm for the groundwater samples. Meanwhile, the petroleum changes at the soil-groundwater interface were successfully observed by Raman microscopy during the in-situ chemical oxidation remediation processes. The results revealed that hydrogen peroxide oxidation released petroleum from the interior to the surface of soil particles and then to groundwater during the remediation process, while persulfate oxidation only degraded petroleum on the soil surface and in groundwater. This Raman spectroscopic and microscopic method can shed light on the petroleum degradation mechanism in contaminated lands, and facilitate the selection of suitable soil and groundwater remediation plans.
研究领域:
环境科学
·
分析化学
·
地球科学
✓ 已验证
DOI
PubMed
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 6
·065101
·
IF 1.62
Yueju Zhao,Xiwei Xie,Jinbiao Shi,Huaping Shan,Min Liu,Jie Liu,Jianhui Wang,Boyan Jia,Yongli Zheng,Qiang Chen,Chunfeng Zhao,Jilin Teng,Wenhua Miao
Due to the long-term operation of power grid and the interference of external uneven electric field environment, silicone rubber insulators are prone to aging and scaling, and their hydrophobicity and external insulation performance are easily affected. In order to solve this problem, a kind of silicone rubber insulator outer surface cleaning and repairing agent was prepared with self-made composite solvent and silicone as the main raw materials, supplemented by catalyst, surfactant and other additives. So as to achieve the dual effect of efficient cleaning and aging repair, improve its hydrophobicity and prolong its service life. Through hardness test, hydrophobicity test, SEM test, FT-IR test, EDS test, mechanical property test and aging test characterization, and comparing the cleaning effect of different cleaning methods, it is found that the cleaning effect of cleaning repair agent is the best. In addition, it is found that the hydrophobicity of insulator has been greatly improved, from HC4 to HC1, and the mechanical properties have also been improved. This is because after using the cleaning and repairing agent, the powdered layer on the insulator surface is removed, and more hydrophobic methylene (Si–(CH3)2) and methylene (Si–(CH3)3) are attached to the insulator surface, which reduces the -OH binding force between the insulator surface and water molecules. In addition, through the observation of the surface and cross-section micro morphology, it is found that the surface roughness of the insulator is greatly reduced and the micro cracks disappear after using the cleaning and repairing agent, which highlights a certain repairing effect. Finally, the aging test also shows that the cleaning repair layer has a certain durability.The results show that the cleaning and repairing agent can effectively clean and repair the aged insulator, improve its anti- pollution flashover ability and prolong the service life of silicone rubber insulator.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2024
·Vol. 65
·期 6
·842-857
·
IF 1
Wanting Zhao,Su Qin,Lyu Ya
Abstract In this paper, tung oil-linseed oil (TO-LSO) and styrene-linseed oil (STY-LSO) were used as raw materials of sulfur-rich copolymers, which were then reversed vulcanized with S 8 at 130°C, and the gel time of the reaction was recorded. At the same time, 1 H NMR, DSC, XRD, sodium sulfite titration and other characterization methods were used to measure the reaction degree, verify the conjugated structure to improve the reaction degree, and study the synthesis mechanism of sulfur-rich copolymer. The results show that the conjugated structure can improve the reaction degree. And when the proportion of TO and STY is 20 and 10% respectively, the reaction gel time is shortened, the reaction degree is greatly deepened, and the effect of promoting polymerization can be significantly obtained. The synthesis mechanism of copolymer is the result of conjugated structure and diallyl group. The self-repair of sulfur-rich copolymers at different temperature and holding time by hot press shows that poly(20-TO-LSO-50S) can realize the S‒S bond self-repair after being compressed at 120°C for 4 h, and the surface of polymer disc was smoother and more uniform. However, poly(10STY-LSO-50S) can be repaired only after being compressed for 8 h. TO can not only enhance the synthesis process, but also enhance the performance of sulfur-rich materials and broaden the application field.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）