COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Lipei Fu,Jing Gong,Qingling Liu,Qianli Ma,Minglu Shao,Kaili Liao,Ailian Chang,Tongyu Zhu,Zhangkun Ren,Tao Wang
In this work, through mixing alkyl primary amines of C n H 2n+1 NH 2 （n=6, HA; n=12, DA; n=18, ODA） and disodium 4-formylbenzene-1, 3-disulfonate (DFD) at 1:1 mol ratio, three novel dynamic imine surfactants (DFD-HA, DFD-DA and DFD-ODA) were synthesized. The imine bond was verified by infrared spectroscopy (IR) and nuclear magnetic resonance (NMR). After preparing the emulsion, DFD-DA exhibited superior stability among the three surfactants at lower concentrations (< 20 mM). Subsequently, an emulsifier system (DFD-DA/LHSB) with excellent interfacial activity and emulsification stability was obtained by blending DFD-DA with lauramidopropyl hydroxy sulfobetaine (LHSB). The system effectively reduced the interfacial tension to the order of 10 −2 mN/m. At a total concentration of 5 g/L and mole ratio (DFD-DA: LHSB = 1:2), the emulsion could be stable for more than 60 days. Contact angle measurements substantiated the superior wettability inversion capability of the system, facilitating the formation of oil-in-water emulsions more effectively. Furthermore, this system possesses remarkable CO 2 responsiveness. After CO 2 injection, the emulsion can be completely demulsified within 45 s in a broad mole ratio range. Changing the relative content of DFD-DA and LHSB can also dynamically regulate the demulsification rate of emulsion. In contrast to previous imine surfactants, the system can achieve full demulsification under higher pH conditions (about 6.0), thereby significantly enhancing the response efficiency and alleviating the equipment corrosion. This discovery provides a new approach to tackling the problems associated with surfactant flooding and heavy oil demulsification, holding important implications for enhancing oil recovery (EOR).
研究领域:
化学工程
·
石油工程
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产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Xiaohong Liu,Liyan Liang,Maoping Lu,Xuan Song,Hehua Liu,Guoyang Chen
Vitrimers with dynamic imine bonds generally show low mechanical properties and water resistance. Here, we report a bio-based vitrimers with dynamic imine bonds synthesized from vanillin, m -xylylenediamine and DGEBA. Among them, the imine metathesis reaction of the dynamic imine bond makes the bio-based vitrimers have rapid stress relaxation behavior, self-healing, remoldability and weldability . In addition, the materials also exhibited high mechanical properties (79.1 MPa) and excellent water insensitivity. Even after being immersed in water for 15 days, the materials still showed a tensile strength of 70.5 MPa and a Young's modulus of 2.32 GPa at a breaking elongation of 6.67%. Importantly, due to the hydrolysis of dynamic imine bonds, the materials also exhibited degradation and ecofriendly recycling capabilities under mildly acidic conditions. We envision that this vitrimers with simple process, excellent comprehensive properties and ecofriendly recyclability will make it a potential candidate for applications in sustainable structural materials.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Yinglu Sun,Dekun Sheng,Haohao Wu,Xinxin Tian,Haopu Xie,Biru Shi,Xiangdong Liu,Yuming Yang
Synthesis of vitrimer with dynamic covalent bond is a surprising solution to overcome the inherent limitations of traditional thermosets . A bio-based vitrimer-like polyurethane formed by castor oil , vanillin , m-xylylenediamine and 4,4′-dicyclohexylmethane diisocyanate in the preparation has superior mechanical properties , good solvent resistance , good thermal stability. Furthermore, the existence of dynamic imine bond in the vitrimer-like polyurethane is prone for polyurethane to rapid stress relaxation behavior, remoldability, weldability , antibacterial ability. With the hydrolysis of the imine bond, the material can be rapidly degraded at 60 °C for 1 h. In addition, it's commendable that the material exhibits excellent reprocessability that can be maintained at 86% even after 3 consecutive smash/mold pressing cycles. This work provides a promising method to manufacture bio-based polyurethane thermosets with excellent reprocessability, rapidly-degradable and antibacterial property, which has also promoted the high-value utilization of biomass materials.
研究领域:
材料科学
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化学工程
·
生物材料
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
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IF 9.1
Jinchuan Chen,Baogang Yuan,Dezhen Yang,Zhenwang Wu,Huajie Xu,Ming Huang,Chuntai Liu,Changyu Shen
Constructing surface hierarchical layer is regarded as an effective surface modification of carbon fibers (CFs) to enhance their composites mechanical properties . However, this method usually deteriorates the intrinsic properties of CF and the hierarchical layer is not fully compatible with thermal processing of the polymer. Here, a novel hierarchical layer consisting of polydopamine, polyethyleneimine and multi-walled carbon nanotubes without damages to CF was successfully decorated on CF surface (CNT@PP-CF) for simultaneously enhancing the mechanical and the electromagnetic interference (EMI) shielding properties of CF reinforced polyamide 66 (PA66) composite. The CNT@PP hierarchical layer with dynamic imine bonds enhanced the interfacial wettability and bonding between CF and PA66 during thermal processing. Compared with that of untreated-CF, the interfacial shear strength and tensile strength of CNT@PP-CF/PA66 composite were increased by 52.3% and 19.2%, respectively. Meanwhile, the EMI shielding performance was enhanced by 89.6%. This improvement would be ascribed to the dynamic imine polar groups and heterogeneous interfaces in the hierarchical layers which enhanced the conductive and dielectric losses of composites. Our research provided a novel approach based on dynamic covalent bond exchanges to achieve the functional and structural integration of CF reinforced thermoplastic resin composites.
研究领域:
材料科学
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复合材料工程
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产品关联
DOI
高影响因子
Materials Today Chemistry
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2025
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IF 6.7
Antai Bian,Penglun Zheng,Zijian Yang,Yuhao Zhou,Pei Zhu,Yawei Meng,Quanyi Liu
The improvement of mechanical properties and flame retardant performance of epoxy resin (EP) composites has long been a significant technical challenge. In this paper, using P/N synergistic flame retardation, a multicomponent flame retardant (DKD) containing imine bonds and silicon was developed by introducing imine bond structures and silicon elements. DKD brings excellent flame retardant properties to EP. The results demonstrated that the inclusion of just 5 wt% DKD enabled EP composites to attain a 29.7 % LOI and a UL-94 V-0 rating. Due to the introduction of large benzene rings and Si– O –Si cross-linking structures, DKD-3/EP's impact strength and DKD-7/EP's flexural strength increased by 15.6 % and 25 %, respectively, versus pure EP. In the CCT test, pure EP achieved a PHRR of 1075.0 kW/m 2 and a THR of 133.4 MJ/m 2 . The PHRR and THR of DKD-7/EP are 649.2 kW/m 2 and 81.1 MJ/m 2 respectively, which are 39.6 % and 39.2 % lower than the pure EP values. In addition, the TSP and SPR of DKD-7/EP decreased by 31.7 % and 24.2 %, respectively. Compared with pure EP, the CO and CO 2 production rates were reduced by 46.6 % and 50.0 %, respectively. Through the study on the flame retardant mechanism of DKD/EP, it was found that the addition of DKD generates dual flame-retardant effects in both the condensed and gas phases, thereby enhancing the fire safety of the EP system.
研究领域:
高分子科学
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材料工程
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消防安全工程
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化学合成
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Lujie Dong,Ping Zhang,Chao Xiao,Xingyou Tian,HuiChao Du,Xian Zhang,Hui Zhang
Electromagnetic interference (EMI) shielding films were widely utilized in various electronic devices, but they were prone to damage and performance degradation in harsh environments. Therefore, it was urgent to maintain stable performance of EMI shielding films. In this work, we adopt the reactions between aldehyde-modified diamine monomers and dianhydride monomers with dynamic imine bond to successfully prepare a self-healing PI (SHPI) film. Benefit from dynamic imine and imide bond, the SHPI film possessed excellent thermal stability (T 5 % =527.7°C), tensile strength (72 MPa) and self-healing efficiency (94.4 %). As protecting coating layer, the SHPI film was able to maintain the commercial aluminized polyimide (PI/Al) film with good EMI shielding performance in acid environment. The electromagnetic shielding film with self-healing coating still had average EMI shielding effectiveness value of 44.5 dB after exposed to 10 % concentration nitric acid solution for 30 min. It is noteworthy that when damaged by external forces, the electromagnetic shielding film with self-healing coating could achieve rapid healing, while the tensile strength was up to 87 MPa and the self-healing efficiency reached 92.5 %. This work provided an effective self-healing protective layer for EMI shielding material against corrosion in acidic environments and damage from external pressures.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Jia-Tao Miao,Meiying Ge,Shuqiang Peng,Jie Zhong,Yuewei Li,Zixiang Weng,Lixin Wu,Longhui Zheng
Shape memory polymer (SMP)-based 4D printing combines the advantages of SMP and 3D printing to form active materials with delicate structure. Nowadays, studies of SMP-based 4D printing materials mainly focus on cross-linked (meth)acrylate of which the permanent shape cannot be changed for their covalent linkage, limiting the usage of 4D printing materials. In this paper, a novel (meth)acrylate monomer with an aldehyde group (2-(methacryloyloxy)ethyl 4-formylbenzoate, MEFB) and hyperbranched cross-linker (HPASi) are synthesized to build (meth)acrylate systems (IEMSis) with dynamic imine bonds for 4D printing. The flexible chain structure of HPASi significantly enhances the toughness of IEMSis, which is 33–97-fold higher than that of the one without HPASi (IEM). The addition of HPASi also endows IEMSis good shape memory properties, and the shape fixity and shape recovery ratios of them are 97.5–97.6 and 91.4–93.7%, respectively. At the same time, IEMSis can undergo a stress relaxation process by dynamic exchanges of imine bonds under relatively mild conditions without a catalyst to acquire an ability of permanent shape reconfiguration. The shape retention ratio of IEMSi3 is 84.3%. In addition, the 4D-printed structures displayed here indicate that these 4D printing systems have a myriad of potential applications including aerospace structures, soft robotic grippers, smart electron switches, and intelligent packaging, while the reconfigurability shown by IEMSi3 will expand the scope of application fields of 4D printing materials.
研究领域:
材料科学
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高分子化学
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智能材料
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Lu Bai,Xingxing Yan,Bingwei Feng,Junping Zheng
Commercial conductive polysiloxane composites are usually unrecyclable and suffer from inherent poor mechanical properties. Herein, mechanically strong, healable, and reprocessable conductive carbon black (CB)/polysiloxane nanocomposites were prepared through incorporating dual crosslinks of imine bonds and Zn(II)-amino coordination bonds in elastomer networks. Following the energy-dissipating mechanisms of sacrificial bonds, the integration of coordination bonds led to the remarkable improvement of strength , stretchability, and toughness without compromising the self-healing ability or reprocessability. Furthermore, the sacrificial and reversible manner of coordination bonds in nanocomposites was studied in detail. In addition to enhancing the electrical conductivity of nanocomposites (i.e., 6.48 S/m at CB content of 12 wt%), the incorporation of CB could promote the rupture of sacrificial bonds and improve the energy-dissipating efficiency significantly.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Ling-Yu Li,Wu Chen,Chang-Hao Hu,Yi-Dong Li,Jian-Bing Zeng
The traditional methods for synthesizing imine-based epoxidized soybean oil (ESO) vitrimers often rely on organic solvents, leading to issues such as incomplete raw material conversion, increased production costs, and environmental concerns, contradicting the principles of green and sustainable chemistry. To overcome these challenges, we propose an innovative one-pot, solvent-free approach for synthesizing imine-linked ESO vitrimers via a melt reaction utilizing ESO, vanillin, and diamines. In this system, three distinct reactions can occur: phenolic hydroxy-epoxy, amino-aldehyde, and amino-epoxy. Our findings indicate that the first two reactions occur more readily and rapidly than the third, facilitating the successful synthesis of the vitrimers. We employed three different diamines to tailor the chemical structure and control properties of the ESO vitrimers; aromatic diamines produced rigid vitrimers with high strength but low ductility, while aliphatic diamines yielded flexible vitrimers with lower strength but higher ductility. All vitrimers exhibited rapid high-temperature stress relaxation and excellent reprocessability and thermal stability. Notably, these vitrimers demonstrated impressive adhesive properties, achieving lap shear strengths between 4.0 and 6.7 MPa when applied to various substrates, including wood, steel, and aluminum. Moreover, the dynamic imine bonds enable exceptional recyclability, removability, and reusability, with recycled ESO vitrimers even surpassing their virgin counterparts in mechanical and adhesive performance, underscoring the significance of this work in advancing sustainable adhesive materials with enhanced functionality and circularity.
研究领域:
材料科学
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绿色化学
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可持续发展
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Bin-Bin Chen,Shuai Chang,Lei Jiang,Jian Lv,Ya-Ting Gao,Yue Wang,Ruo-Can Qian,Da-Wei Li,Mahmoud Elsayed Hafez
Carbon dots (CDs), as new type of carbon-based nanoparticles, are considered to be an aggregate with irreversible polymerization. Achieving the reversible tunability of CDs luminescence based on their reversible polymerization is a challenging subject. Herein, we, for the first time, design and construct the blue-emitting CDs with reversible polymerization by a room-temperature Schiff base reaction between tannic acid and ethylenediamine. The formation of CDs is proven to be due to the crosslinking polymerization of precursors caused by imine bond. As a dynamic covalent bond, imine bond endows CDs with controllable structural transformation properties, and the prepared CDs can be depolymerized and polymerized reversibly by pH-controlled imine bond cleavage and re-formation. These properties of reversible fluorescence photoswitching make the CDs have a good application prospect in reversible information encryption.
研究领域:
材料科学
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纳米技术
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化学
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光学
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产品关联
DOI
PubMed
高影响因子
Energy & Environmental Materials
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2022
·Vol. 6
·期 6
·e12448
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IF 13.443
Yin Zhou,Yingying Zhu,Zuan Hu,Xiaoying Yang,Pengkun Yang,Lu Huang,Yingpeng Wu
Flexible conductive fibers are essential for wearable electronics and smart electronic textiles. However, in complex operating conditions, conductive fibers will inevitably fracture or damage. Herein, we have developed an elastic conductive self-healable fiber (C-SHF), of which the electrical and mechanical properties can efficiently heal in a wide operating range, including room temperature, underwater, and low temperature. This advantage can be owed to the combination of reversible covalent imine bond and disulfide bond, as well as the instantaneous self-healing ability of liquid metal. The C-SHF, with stretchability, conductivity stability, and universal self-healing properties, can be used as an electrical signal transmission line at high strain and under different operating conditions. Besides, C-SHF was assembled into a double-layer capacitor structure to construct a self-healable sensor, which can effectively respond to pressure as a wearable motion detector.
研究领域:
材料科学
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电子工程
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柔性电子
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智能纺织品
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Chaoying Hu,Jiawei Li,Xianjie Pan,Yanning Zeng
Conventional polyurethane (PU) networks fabricated from nonrenewable fossil resources are difficult to be recycled, reprocessed, and reshaped because of the permanent covalent cross-linked networks, and the flammability of PU networks limits their wide application. Herein, the novel polyols were synthesized from renewable vanillin and then reacted with hexamethylene diisocyanate (HDI) trimer to obtain versatile bio-based PU networks with dynamic disulfide and imine bonds for the first time. Obtain malleable PU networks that possess excellent reprocessability and self-healing performance, as well as superior fire resistance. The vanillin-based PU networks show a high T 5d of ∼180 °C, high char yield of 23% at 800 °C, fast stress relaxation of ∼38 s at 80 °C, excellent scratch self-healing performance with approximately 100% healing efficiency at 120 °C for 90 min, outstanding flame retardancy with high LOI of ∼30% and UL-94 V0 rating. Additionally, the vanillin-based PU networks display excellent malleability with the activation energy ( E a ) of 30.2–54.8 kJ•mol −1 due to dual dynamic bonds in the networks, which can be recycled in 60 min at 120 °C by hot pressing. Moreover, the vanillin-based PU networks with Schiff base can be degraded rapidly in the mixture of HCl and THF. Briefly, produced PU networks from abundant and renewable resources are significant examples to foster the development of versatile PU network materials.
研究领域:
材料科学
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聚合物化学
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可持续材料
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消防安全工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）