JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Menglei Yuan,Lei Zhang,Tianxin Wang,Yiming Liu,Qiongguang Li,Jinxiong Wu,Junwu Chen,Jintong Zhang,Hailun Yang,Guangjin Zhang
Electrocatalytic water splitting in an alkaline medium is recognized as the promising technology to sustainably generate clean hydrogen energy via hydrogen evolution reaction (HER), while the sluggish water dissociation and subsequent *H adsorption steps greatly retarded the reaction kinetics and efficiency of the overall hydrogen evolution process. Whilst nitrogen (N)-doped carbon-based materials are attractive candidates for promoting HER activity, the facile fabrication and gaining a deeper insight into the electrocatalytic mechanism are still challenging. Herein, inspired by the Diels-Alder reaction, we precisely tailored six-membered pyridinic N and five-membered pyrrolic N sites at the edge of the carbon substrates. Comprehensive analysis validates that the participation of pyridinic N (electron-withdrawing) and pyrrolic N (electron-releasing) will induce the charge rearrangements, and further generate local electrophilic and nucleophilic domains in adjacent carbon rings, which guarantees the occurrence of water dissociation to generate protons and the subsequent adsorption of *H intermediates through electrostatic interactions, thereby facilitating the overall reaction kinetics. To this end, the optimal NC-ZnCl 2 -25 % electrocatalysts present excellent alkaline HER activity (η 10 = 45 mV, Tafel slop of 37.7 mV dec -1 ) superior to commercial Pt/C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jinhui Li,Qiang Liu,Derek Ho,Songfang Zhao,Shuwen Wu,Lei Ling,Fei Han,Xinxiu Wu,Guoping Zhang,Rong Sun,Ching-Ping Wong
Wearable electronics with excellent stretchability and sensitivity have emerged as a very promising field with wide applications such as e-skin and human motion detection. Although three-dimensional (3D) graphene structures (GS) have been reported for high-performance strain sensors, challenges still remain such as the high cost of GS preparation, low stretchability, and the lack of ability to heal itself. In this paper, we reported a novel self-healing flexible electronics with 3D GS based on Diels–Alder (DA) chemistry. Furfurylamine (FA) was employed as a reducing as well as a modifying agent, forming GS by FA (FAGS)/DA bonds contained polyurethane with the “infiltrate-gel-dry” process. The as-prepared composite exhibited excellent stretchability (200%) and intrinsic conductivity with low incorporation of graphene (about 2 wt %), which could be directly employed for flexible electronics to detect human motions. Besides, the FAGS/DAPU composite exhibited lower temperature retro-DA response for the continuous graphene networks. Highly effective healing of the composites by heat and microwave has been demonstrated successfully.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 4
·1269-1280
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IF 2.573
Shuo Chen,Yu Feng,Zhi-Yuan Zhang,Xiang-Yuan Li,Jun-Ying Zhang,Jing-Bo Zhao
Diels–Alder (DA) addition is an efficient method to repair damages at mild conditions. It is often used in self-healing polyurethanes and epoxy resins and seldom used in cross-linked polyamides (cPAs). Michael addition becomes a useful method to synthesize cPAs. However, no efficient way has been established to conduct double-addition of primary amines. In this work, organic catalyzed Michael addition and polycondensation were established to prepare polyamide oligomers with furan pendent groups (pFU-PAs), and a DA addition was adopted to prepare self-healing cross-linked polyamides (SH-cPAs). A bulk double Michael addition of furfurylamine and methyl acrylate was performed at 30–70°C in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD), or 4-(N,N-dimethylamino) pyridine (DMAP), and a high yield of furfurylamine-N,N-bis(methyl propionate) (FA-BMP) was prepared. The catalytic activity order is MTBD>TBD >>DMAP in Michael addition. Melt polycondensation of FA-BMP with bis(2-aminopropyl) polypropyleneglycol and hexamethylene diamine was catalyzed by MTBD and N,N′-diphenylthiourea. The DA addition of 1,5-bismaleimido-2-methylpentane and pFU-PAs was monitored by FT-IR, 1 H NMR, DSC, polarizing optical microscopy, and gel content. In these catalyzed processes, the structures of FA-BMP, pFU-PAs, and SH-cPAs were controlled easily, and the SH-cPAs showed good mechanical property and excellent self-healing performance of 88%–98%.
研究领域:
材料化学
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yufeng Ma,Yu Bei,Meng Zhang,Fei Song,Feilong Hu,Zhimin Kou,Lihong Hu,Yonghong Zhou,Puyou Jia
Woody oil is extracted from the fruits or seeds of woody plants . Preparing woody oil based and biodegradable plasticizer via solvent-free Diels-Alder reaction can reduce plasticizer enrichment and pollution, as well as dependence on petrochemical resources. Herein, woody oil based plasticizer (TOP-Ⅰ and TOP-Ⅱ) were successfully synthesized from renewable woody oil via solvent-free Diels-Alder reaction. Chemical structure of TOP-Ⅰ and TOP-Ⅱ was characterized with 1 H NMR, Biodegradation of TOP-Ⅱ was investigated in active soil and digestive system of Tenebrio molitor . Degradation products were extracted from active soil and Tenebrio molitor feces, the results showed that TOP-Ⅱ experienced biodegradation and formed degradation components with low molecular weight substances. The insect degradation of bio-based plasticizers was first reported and provided an effective way to reduce plasticizer enrichment and pollution. In addition, TOP-Ⅰ and TOP-Ⅱ was used to replace petroleum-based and non-degradable dioctyl phthalate (DOP) in plasticized poly(vinyl chloride) (PVC). The obtained plasticized PVC with TOP-Ⅰ and TOP-Ⅱ showed improved thermal stability, aging resistance, plasticization and solvent extraction resistance, the related mechanism behind these performances were also explored.
研究领域:
化学工程
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环境科学
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生物学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Jinsong Wang,Farzad Seidi,Xiaotong Shi,Chengcheng Li,Yang Huang,Huining Xiao
In the current research, we explored the fabrication of thermo-reversible polymer networks made of bio-based materials to address the growing need for greener and more sustainable polymer coating . Herein, we developed thermally self-healing lignin-based coatings with strong anticorrosion performances through Diels-Alder crosslinking strategy. Accordingly, organosolv lignin was first functionalized by furan moieties and then used for thermally crosslinking by 4,4′-bismaleimidodiphenylmethane (BMI) after spin casting on the surface of steel sheets. Under the optimum conditions, the obtained coating could generate smooth and defect free layers. A thin layer (18 μm) of this coating could increase the E corr from −481 mV (for bare steel) to +142 mV and reduced the corrosion rate (CR) over 3300 times. Importantly, the thermo-reversibility of the network endows excellent self-healing ability to the coating. Indeed, lignin self-healing coatings based on thermo-reversible Diels-Alder reaction provides a creative strategy for bio-based materials applied in anticorrosion applications with high-performance.
研究领域:
材料科学
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化学工程
·
可持续发展
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1236-1244
·
IF 3.069
Jianfeng Xu,Xiaomin Zhao,Feixiang Liu,Lun Jin,Guohua Chen
Functionalized graphene (G-MA) was prepared by a facile wet ball milling strategy, which achieved exfoliation and functionalization of graphite simultaneously. The G-MA showed excellent dispersion in water and polar solvents. Thus, a G-MA coating was prepared from G-MA in mixed solvents (H2O–ethanol) without binder or surfactant. The scanning electron microscope (SEM) images of the G-MA coating exhibited a smooth and flat surface. The G-MA coating showed a conductivity of 769 S m−1 at room temperature, and a big increase could be found at 2000 S m−1 after thermal treatment under 200 °C for 2 h, indicating the restoration of the conjugated structure via the reverse Diels–Alder reaction. This synthetic method of functionalized graphene offers a powerful strategy for the reversible modification of the graphene electronic properties, which may expand their usage.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Changhong Lin,Huan Ge,Tianle Wang,Min Huang,Puyou Ying,Ping Zhang,Jianbo Wu,Shibin Ren,Vladimir Levchenko
The realization of recyclable materials is an urgent problem to be solved for extending practical applications in industry. Herein, a simple method was proposed to prepared the recyclable materials thorough dynamic reversible chemistry . In this work, we design the recyclable and self-healing polyurethane based on the thermoreversible dynamic Diels-Alder reaction. In addition, the Halloysite nanotubes (HNTs) were introduced into the system to improve the thermal properties, mechanical properties of polyurethane nanocomposites (PUDM/HNTs). The tensile tests showed that the HNTs can significantly improved the mechanical properties of nanocomposites. The healing efficiency above 90% on average was achieved which was determined by the recovery of breaking strength . Besides, the composites exhibited outstanding reprocessability via thermally induced. Therefore, Such excellent recyclable performance and self-healing ability give the polyurethane materials an opportunity to have great potential in the fields of save-energy, friendly-environment materials.
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
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 38
·期 4
·968-973
·
IF 1.307
Yang Shengqing,Zhao Jinnan,Chen Shuo,Zhao Jingbo
Three new thermally responsive self-healing cross-linked polyamides(cPA-FU-DAs) with good tensile strength and toughness were synthesized through bulk Michael addition, polycondensation, and Diels-Alder reaction. Unlike common stable polymers, cPA-FU-DAs can seal cracks by mere heating. First, the Michael addition of methyl acrylate and furfurylamine was conducted, and a furfurylamine-diester(FU-DE) was prepared. FU-DE was transformed into polyamide prepolymers that contained furfuryl pendant groups(PA-FUs) through bulk polycondensation with a poly(propylene glycol)(PPG) diamine and a PPG triamine. PA-FUs were crosslinked by bismaleimide, and cPA-FU-DAs were prepared. The Michael addition was monitored by Fourier transform infrared spectroscopy and electrospray ionization mass spectroscopy. The reverse DA reaction of the cPA-FU-DAs was demonstrated by differential scanning calorimetry and dissolution property. Their thermally self-healing properties were verified by polarizing optical microscopy and tensile test. The cPA-FU-DAs exhibited good mechanical properties and high self-healing efficiency. They self-healed at 130 °C. The tensile strength after repairing was up to 19 MPa with self-healing efficiency reaching 92%.
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
RSC Advances
·
2018
·Vol. 8
·期 20
·11036-11042
·
IF 2.936
Gang Wang,Jiehua Zhu,Xiaofeng Chen,Hua Dong,Qingtao Li,Lei Zeng,Xiaodong Cao
In recent years medical devices manufacturers have been looking for antimicrobial coatings which are biocompatible and non-toxic for a wide range of medical devices. The demand for these antimicrobial coatings has increased significantly, owing to the increased incidence of hospital-associated infections (HAIs). Hydrogels have been widely used in biomedical applications due to their hydrophilicity, biodegradability, non-toxicity and biocompatibility. In this work, sodium alginate (SA) based antibacterial hydrogels SA/PEG–HHC10 were designed and prepared by combining Diels–Alder (DA) click chemistry and the thiol–ene reaction. The hydrogels were first prepared using DA click chemistry with good mechanical strength, then the cysteine-terminated antimicrobial peptide HHC10–CYS (HHC10) was grafted into the hydrogel by the thiol–ene reaction between the oxy-norbornene group and the thiol group. The results showed that the antimicrobial hydrogels had a strong antibacterial property and good biocompatibility. Therefore, the antimicrobial hydrogels have significant potential application as coatings for implantable medical devices.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 58
·期 20
·2951-2962
·
IF 0
Kai Ma,Guofei Chen,Yonggang Zhang
A series of cross-linked polyimides (PIs) were prepared via two-step solution polycondensation from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and 2,5-furandicarboxylic acid-based diamines, N,N ′-bis(4-amino-2-(trifluoromethyl)phenyl)furan-2,5-dicarboxamide (TFFDA) and N,N ′-bis(4-aminophenyl)furan-2,5-dicarboxamide ( p -FDDA), followed by thermal crosslinking reaction with bismaleimide. The thermal crosslinking reaction and its mechanism were studied by FTIR spectra and model reaction analysis, which showed Diels–Alder reaction between furan group and maleimide group played a main role in the thermal treatment. The properties of cross-linked PIs were characterized using dynamic mechanical thermal analysis, thermogravimetric analyses, tensile testing, ultraviolet-visible spectra, and wide-angle X-ray diffraction. The cross-linked polyimide film showed improved solvent-resistance, thermal and mechanical properties with T g values of 234–306 o C, tensile strengths of 82–98 MPa and moduli of 2.3–3.0 GPa. Graphical Several cross-linked polyimides (PIs) were prepared via polycondensation of dianhydride and 2,5-furandicarboxylic acid (2,5-FDCA)-based diamines, N,N ′-bis(4-amino-2-(trifluoromethyl)phenyl)furan-2,5-dicarboxamide, and N,N ′-bis(4-aminophenyl)furan-2,5-dicarboxamide, and following thermal crosslinking reaction with bismaleimide. These PIs exhibit outstanding thermal and mechanical properties. The crosslinking network of 2,5-FDCA-based PIs and bismaleimide is constructed for the first time by Diels–Alder reaction. The thermal crosslinking mechanism is also studied in detail using model reaction.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
Polymers
·
2024
·Vol. 16
·期 14
·2029
·
IF 4.7
Tao Yang,Changhong Lin,Min Huang,Puyou Ying,Ping Zhang,Jianbo Wu,Tianle Wang,Alexander Kovalev,Nikolai Myshkin,Vladimir Levchenko
With the background of the fossil fuel energy crisis, the development of self-healing and recyclable polymer materials has become a research hotspot. In this work, a kind of cross-linking agent with pendent furan groups was first prepared and then used to produce the Polyurethane elastomer based on Diels–Alder chemistry (EPU–DA). In addition, in order to further enhance the mechanical properties of the elastomer, cellulose nanofibers (CNFs) were added into the Polyurethane system to prepare a series of composites with various contents of CNF (wt% = 0.1~0.7). Herein, the FTIR and DSC were used to confirm structure and thermal reversible character. The tensile test also indicated that the addition of CNF increased the mechanical properties compared to the pure Polyurethane elastomer. Due to their reversible DA covalent bonds, the elastomer and composites were recycled under high-temperature conditions, which extends Polyurethane elastomers’ practical applications. Moreover, damaged coating can also be repaired, endowing this Polyurethane material with good potential for application in the field of metal protection.
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 3
·1239-1250
·
IF 2.578
Shanjun Ding,Jun Zhang,Lin Zhou,Yunjun Luo
Polymer composites with self-healing ability are highly desired for applications in advanced modern devices. Here, we report on self-healing polymer composites consisting of silver deposited-carbon nanotubes hybrid nanoparticles (CNT-Ag) as fillers and self-healable polyurethane (DAPU) as a matrix based on thermally reversible Diels-Alder reaction. The results indicated that as the hybrid filler loading is 1 wt%, the composites not only obtained a high-strength (~15.97 MPa) and high healing efficiency (~90.1%) by increasing filler loading after healing, but also enhance thermal conductivity (~1.65 Wm −1 K −1 ) and obviously shorten its healing progress in comparison with other composites in the case of the same healing time. Given that Ag_NPs deposited on the surfaces of the CNTs act as bridges to link the adjacent CNTs and reduce interfacial thermal resistance, which can effectively explain the reasons for the obtained high mechanical strength and healing efficiency and promoting healing progress in the polymer composites. This work may offer a novel strategy for balancing relation between mechanical property, healing ability and healing progress in the field of self-healing materials application.
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
危险品化学品经营许可证（带存储）