JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Jia Li,Ming Wen,Lei Lei,Cheng Fu,Zeyin Jiang
In this study, a novel surfactant with pH-responsive properties was developed to address the challenges associated with balancing foaming and defoaming properties in traditional foam drainage gas recovery processes. The surfactant was created by employing primary amine and aldehyde monomers based on the principles of reversible dynamic covalent bonds. Optimal synthesis conditions were determined through an extensive analysis of foaming performance: a molar reaction ratio of primary amine to aldehyde at 10:0.8, a 20-minute reaction time, and a stirring speed of 300 r/min. The formation of dynamic imine bonds was confirmed through infrared spectroscopy. Surface tension measurements revealed that at pH = 8, the surfactant achieved a minimum surface tension of 31.1 mN/m, while at pH = 3, the surface tension exceeded 40 mN/m. Particle size analysis demonstrated a 26.5-fold reduction in particle size as the pH decreased from 8 to 3. Zeta potential tests indicated excellent dispersion stability within the pH range of 3–8, with Zeta potential consistently exceeding 25 mV. Furthermore, the surfactant displayed remarkable foaming and foam stabilizing effects at pH = 8, with initial and 5-minute foam heights reaching 168 mm and 132 mm, respectively. When the pH dropped below 6, the surfactant exhibited rapid defoaming. After six cycles of alternating acid-base environments, it maintained excellent foaming performance, achieving a 5-minute foam height of up to 138 mm. Importantly, it retained its foaming capabilities in formation water solutions with a mineralization degree of 200 g/L. These findings hold significant implications for the development of intelligent environmental response treatments for foam drainage and gas production, enhancing the overall efficiency of drainage and gas production operations.
研究领域:
化学工程
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石油工程
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材料科学
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产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 16
·2200083
·
IF 5.006
Muqing Cao,Peng Zhao,Cheng Liu,Jiahao Xia,Huaping Xu
In both natural and artificial functional systems, the cooperation between different dynamic interactions is of vital importance for realizing complicated functions. Dynamic covalent bonds are one kind of relatively stable dynamic interactions and have shown synergistic effect in natural systems such as functional proteins. However, synergistic interactions between different dynamic covalent bonds in polymeric materials are still unclear. Herein, polymeric materials containing diselenide and imine bonds are prepared, and then the synergistic effect between the two dynamic covalent bonds is quantitatively evaluated in typical processes of dynamic materials. The results reveal that dynamic covalent bonds show weak synergistic effect in the degradation process and have strong synergistic effect in stress relaxation process. Therefore, introducing multiple dynamic covalent bonds in polymeric materials can extensively enhance their dynamic properties.
研究领域:
材料科学
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化学
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高分子科学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
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2023
·
IF 7.4
Min Li,Jiaqi Tang,Yan Luo,Jinglun Yang,Jianfei Liu,Junxia Peng,Yu Fang
A new kind of imine bond-based fluorescent nanofilm was developed as multifunctional materials for high-performance detection and efficient removal of hydrogen chloride (HCl) and ammonia (NH3). The flexible, uniform, and photochemically stable nanofilms as prepared showed fast (<1 and <0.5 s), sensitive (<150 ppb and <1.5 ppm), and selective response to HCl and NH3, respectively, and the removal efficiencies to HCl and NH3 are 187.5 and 37.5% (w/w), respectively. A reversible earthy-red to green fluorescence color change upon adsorption of NH3 or HCl enabled visualized monitoring of the two gases in the air. Mechanism studies revealed that the adsorption of HCl is a result of hydrogen bond formation between the analyte and the imine groups. Adsorption of NH3, however, is a result of chemical reaction with the pre-adsorbed HCl. The applicability of the detection and removal strategies as developed was further verified by conducting the tests on real-life or simulated scenarios.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
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2025
·
IF 6.3
Cong Yang,Xinnian Xia,Suirong Fu,Fangtao Liu,Wensheng Li
The development of high-performance bio-based epoxy resins with superior heat resistance, mechanical and flame-retardant properties represent a critical pathway toward addressing advanced manufacturing demands and promoting sustainable development. Concurrently, efficient recycling technologies for carbon fiber (CF) from carbon fiber reinforced polymer (CFRP) waste are urgently needed. In this study, a divanillin-derived tetra-functional bio-based epoxy monomer (ADP-EP) containing imine bonds was synthesized and cross-linked with 4,4-diaminodiphenylmethane (DDM) and nadic methyl anhydride (NMA) to form two distinct cross-linked networks. The ADP-EP/DDM system exhibited exceptional heat resistance and mechanical properties, with a glass transition temperature ( T g ) of 259.3 ℃ and tensile strength of 100.2 MPa, significantly exceeding those of the conventional DGEBA/DDM system (180 ℃, 65.6 MPa). Microscale combustion calorimetry (MCC) revealed low flammability, with heat release capacity (HRC), peak heat release rate (PHRR), and total heat release (THR) reduced by 78.7 %, 79.2 %, and 48.2 %, respectively, compared to the DGEBA/DDM control. Moreover, the ADP-EP/DDM achieved a V0 rating in the vertical burning test (UL-94), confirming its intrinsic flame retardancy. Interestingly, incorporating ADP-EP into the anhydride-cured system enhanced heat resistance, with the D 5 A 5 /NMA system (5:5 DGEBA/ADP-EP molar ratio) demonstrating a T g of 189.1 ℃ while maintaining high tensile strength (75.2 MPa). Notably, the synergistic effect of dynamic imine and ester bonds enabled efficient degradation of the D 5 A 5 /NMA network under mild conditions (160 ℃ in 2-aminoethanol), achieving complete decomposition within 34 min. This approach effectively overcame the degradation challenges of high-temperature-resistant materials and enabled non-destructive recycling of CF from CFRP composites (CF-D 5 A 5 /NMA). The study provides innovative concepts for designing bio-based epoxy resins with high performance and degradability, offering significant scientific value and application potential in aerospace and sustainable composite materials.
研究领域:
材料科学
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高分子化学
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可持续制造
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复合材料技术
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阻燃性能
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化学回收
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航空航天材料
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产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Le Li,Haishun Zhang,Zhongyuan Zhang,Yifan Liu,Huajie Shen,Guangxi Li,Fan Wang,Runxing Zhou,Yunpeng Liu
The insulation strength of the air gap in transmission line towers can be effectively improved by spraying or brushing a local insulation layer in transmission line towers and cross-arms. However, this layer is susceptible to aging, peeling, and costly secondary repairs. To address these issues, the authors synthesized self-healing polyurea-based resin materials with varying isocyanate molar ratios by introducing a dynamic imine bond. The influence of these ratios on the material’s comprehensive performance was investigated through experimental analysis of their thermal, mechanical, and electrical service characteristics, as well as self-healing properties. Results revealed that considerably large or small isophorone diisocyanate: hexamethylene diisocyanate (IPDI:HDI) molar ratios adversely influence the comprehensive performance of the resin materials. When IPDI:HDI was optimized at 6:4, the resin material exhibited excellent physicochemical and electrical performance, with a static water contact angle of 102.37°, a low surface free energy of 18.61 mN m −1 , and tensile strength of 13.87 MPa. The material exhibited no mass loss between 0℃ and 250℃ and achieved a dielectric strength of 43.89 kV mm −1 . In addition, it maintained a dielectric constant of 3.72 and dissipation factor of 0.26 % at 25℃ and 50 Hz, while showcasing excellent self-healing capabilities, enabling scratch recovery within 45–90 min at 50℃. These findings highlight the potential of self-healing polyurea-based resins containing dynamic imine bonds as a new and promising solution for enhancing the durability and reliability of local insulating materials for use in transmission line towers.
研究领域:
高分子材料
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电气绝缘技术
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自修复材料
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化学工程
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功能材料
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Kuirong Deng,Suping Zhou,Zelin Xu,Min Xiao,Yuezhong Meng
High-performance polymer electrolytes with the capability to self-heal mechanical damage can effectively enhance reliability, safety and service life of the batteries. Herein, a novel polymer electrolyte (PBPE) with excellent self-healing capacity and high ionic conductivity was developed. PBPE with polymer networks cross-linked by highly reversible imine bonds was fabricated by the Schiff-base reaction between poly(ethylene glycol) diamine and benzene-1,3,5-tricarbaldehyde. PBPE can quickly repair the cut damage spontaneously within 1 h at room temperature and recover its mechanical strength and electrochemical properties. The healed PBPE exhibits almost the same ionic conductivities and mechanical properties as the original PBPE shows. PBPE possesses the highest ionic conductivity (4.79 × 10 −3 S cm −1 at 30 °C) among the self-healing polymer electrolytes. PBPE can promote the generation of LiF-rich SEI and effectively suppress dendrite growth on Li metal anodes. LiFePO 4 (LFP) cells assembled with PBPE exhibit excellent rate capability (discharge capacity of 118.2 mAh g −1 at 5 C rate) and good cycling performance (capacity retention of 97.8% over 125 cycles). More importantly, the healed PBPE can completely recover its properties from damage in LFP cells and enable the cells to possess cycle performance identical to original PBPE.
研究领域:
材料科学
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电化学
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能源存储
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高分子化学
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电池技术
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 66
·37715-37723
·
IF 2.936
Yinli Liu,Dequn Wu,Xueli Wang,Jianyong Yu,Faxue Li
Considering the excellent thermo-mechanical properties, chemical stability and low cost of biodegradable aliphatic–aromatic copolyesters, they are an ideal matrix when functionalized for capturing pollutants in wastewater. In this work, biodegradable poly((butylene succinate-co-terephthalate)-co-serinol terephthalate) (PBSST) copolyesters with amino side group (–NH2) were first synthesized through copolymerization, followed by grafting carboxymethyl-β-cyclodextrin (CM-β-CD) into PBSST molecular chains via amidation reaction to prepare PBSST-g-β-CD. The corresponding nanofibrous membranes were then fabricated by electrospinning as adsorbents for efficiently removing cationic dye methyl blue (MB) from aqueous solutions. The adsorption performance of the nanofibrous membranes was fitted well with pseudo-second-order model and Langmuir isotherm model. The maximum adsorption capacity was 543.48 mg g−1 for MB along with a removal efficiency of 98% after five regeneration cycles, indicating the high adsorption capacity and good recyclability of nanofibrous membranes. The adsorbents possess features of high adsorption capacity, eco-friendliness and easy operation, and exhibit great potential for disposing of printing-dying wastewater.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 42
·e54544
·
IF 3
Guangchao Dong,Yuanzhi Chang,Cangang Li,Lifen Zhao,Xiujuan Tian,Xueping Liu
Polyurethane is a widely used viscoelastic polymer known for its exceptional damping properties. This paper focuses on the introduction of disulfide and imine bonds into the polyurethane matrix to enhance its damping capabilities, mechanical properties, and self-healing ability. Dynamic mechanical analysis shows that the synergistic effect of disulfide bond and imine bonds extends the effective damping temperature range of the polyurethane to 118°C (−18 to 100°C), while the effective damping frequency extrapolates to a range of 10 −2 –10 5 Hz. Furthermore, the addition of imide bonds compensates for the relatively low mechanical properties associated with disulfide bonds, allowing the polyurethane to achieve a tensile strength of 14.7 MPa at room temperature. Self-repair tests reveal that the combined action of these two dynamic bonds enables a remarkable 97% repair efficiency of polyurethane, exhibiting excellent self-healing performance. This study presents a novel approach to enhance the comprehensive properties of polyurethane.
研究领域:
材料科学
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高分子化学
·
机械工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yanhan Tao,Hui Yang,Guoming Yuan,Zhijun Liu,Bo Yang,Kun Wu,Jun Shi
Epoxy resins face a dual challenge in advanced miniaturized and high-power devices: the need for efficient thermal management to ensure operational stability, alongside the inherent difficulty in recycling their covalently cross-linked networks at end-of-life. To address these issues, two epoxy monomers (H-LM and F-LM) containing imine bonds and biphenyl-based liquid crystalline mesogens were synthesized. X-ray diffraction analysis (XRD) showed crystallite sizes of 23.64 nm (H-LM) and 30.93 nm (F-LM), with relative crystallinities of 39 % and 41 %, respectively. Cured epoxy resins (H-LMD, F-LMD) exhibited intrinsic high thermal conductivity due to enhanced phonon transport via π-π conjugation between imine bonds and biphenyl units in the crosslinked network. H-LMD achieved in-plane ( λ ‖) and through-plane ( λ ⊥ ) thermal conductivities of 0.614 W/(m·K) and 0.299 W/(m·K), respectively, surpassing conventional epoxy resins ( λ ‖ = 0.23–0.38 W/(m·K)). Fluorination enhanced molecular rigidity and structural order in F-LMD, yielding higher λ ‖ (0 . 718 W/(m·K)) and λ ⊥ (0 . 42 W/(m·K)), along with a tensile strength of 99.67 MPa, fracture strain of 6.33 %, and hydrophobicity (water contact angle: 110.95 °). Dynamic imine bonds enabled efficient resin recycling via amine exchange, Fourier transform infrared spectroscopy (FTIR) confirmed. Interestingly, although the recycled resins (H-LMD-1 and F-LMD-1) exhibited a decrease in in-plane thermal conductivity by 36.7 % and 10.5 %, respectively, compared to their pristine counterparts, their tensile strength was significantly enhanced by 23.5 % and 8.4 %. This work provides an effective strategy to concurrently tackle the coupled challenges of low intrinsic thermal conductivity and poor recyclability in conventional thermosetting epoxy resins.
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2019
·
IF 0
Jinfeng Lei,Xinying Li,Shen Wang,Lun Yuan,Liming Ge,Defu Li,Changdao Mu
The self-healing hydrogels are extremely attractive in biological and biomedical fields. The imine bond obtained by the Schiff base reaction is a commonly used dynamic covalent bond to fabricate self-healing hydrogels. Gelatin is a commonly used natural macromolecule in the biomedical field with excellent biocompatibility, biodegradability, and nonimmunogenicity. However, the gelatin-based hydrogels with self-healing ability are rarely reported based on imine bonds. Herein, we present a facile approach to fabricate a gelatin hydrogel with self-healing ability based on the Schiff base reaction. The gelatin was first reacted with ethylenediamine to increase the content of amino groups. Then dialdehyde carboxymethyl cellulose was used to cross-link amino-gelatin to fabricate the self-healing hydrogel. The results showed that the fabricated hydrogel exhibited good self-healing ability as expected because of the formed dynamic imine bonds between amino-gelatin and dialdehyde carboxymethyl cellulose. The hydrogel also presented good fatigue resistance and self-recovery capacity. Moreover, the self-healing hydrogel possessed ideal hemocompatibility and cytocompatibility. In sum, the fabricated self-healing hydrogel has application prospects in biomedical fields, such as injectable cell and drug carrier and injectable tissue engineering scaffold.
研究领域:
生物工程
·
生物医用材料
·
组织工程
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产品关联
DOI
Science China-Life Sciences
·
2020
·Vol. 64
·期 3
·443-451
·
IF 4.611
Luan Dongrui,Zhao Zengteng,Xia Dandan,Zheng Qiuling,Gao Xiaonan,Xu Kehua,Tang Bo
Sodium selenite has alleviating effects on liver fibrosis; however, its therapeutic molecular mechanism remains unclear. Herein, hydrogen selenide, a major metabolite of Na 2 SeO 3 , was tested to uncouple the sulfilimine bond in collagen IV, the biomarker of liver fibrosis. A mouse model of liver fibrosis was constructed via a CCl 4 -induced method, followed by the administration of 0.2 mg kg −1 Na 2 SeO 3 via gavage three times per week for 4 weeks. Changes in H 2 Se, NADPH, and H 2 O 2 levels were monitored in real time by using NIR-H 2 Se, DCI-MQ-NADPH, and H 2 O 2 probes in vivo , respectively. H 2 Se continuously accumulated in the liver throughout the Na 2 SeO 3 treatment period, but the levels of NADPH and H 2 O 2 decreased. The expression of collagen IV was analyzed through Western blot and liquid chromatography-mass spectrometry. Results confirmed that the sulfilimine bond of collagen IV in the fibrotic mouse livers could be broken by H 2 Se with the Na 2 SeO 3 treatment. Therefore, the therapeutic effect of Na 2 SeO 3 on liver fibrosis could be mainly attributed to H 2 Se that uncoupled the sulfilimine bond to induce collagen IV degradation. This study provided a reasonable explanation for the molecular mechanism of the in vivo function of Na 2 SeO 3 and the prevention of liver fibrosis by administering inorganic selenium.
研究领域:
药理学
·
生物化学
·
肝病学
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产品关联
DOI
PubMed
高影响因子
Chem
·
2023
·
IF 23.5
Zhifang Wang,Yushu Zhang,Ting Wang,Liqin Hao,En Lin,Yao Chen,Peng Cheng,Zhenjie Zhang
It remains challenging to synthesize highly crystalline covalent organic frameworks (COFs) with poor reversible bond linkages because of the irreversible bond formation chemistry, which typically affords COFs with underrated crystallinity and porosity. Here, we report a general, green, and scalable protocol to fabricate imide-linked COFs based on organic flux-mediated syntheses. In contrast to traditional solvothermal approaches, this synthetic methodology is controllable, environment-friendly without any toxic organic solvents, and can be easily scalable to a 10-g scale. After an in-depth investigation, we prove the existence of a two-step reaction mechanism, which adjusts the formation and crystallization rate of COFs. Thus, this flux synthesis route can produce COFs with enhanced crystallinity and porosity, leading to outstanding gas sorption/separation performance. Moreover, anhydride, carboxylic, and amide monomers can all be employed to produce imide-linked COFs. This work enriches the synthesis toolboxes for COFs and presents a potential pathway to industrial-scale synthesis of COFs.
研究领域:
材料化学
·
有机化学
·
晶体工程
·
多孔材料
·
气体吸附与分离
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DOI
高影响因子
危险品化学品经营许可证（带存储）