CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cheng-wang Shi,Xiao-dong Li,Xu-feng Zhang,Mei-shuai Zou
Thermosetting epoxy resins with high strength , high toughness, and recyclability are strongly sought after, but due to crosslinked structure, balancing strength and toughness and achieving degradation and reprocessing of resins is a challenge. Enhancing strength without compromising toughness during designing recyclable epoxy resin is a challenging task. Herein, a solution is demonstrated where isofluorodioxanone diisocyanate (IPDI), Poly (propylene glycol) bis(2-aminopropyl ether) (D230), and naturally occurring vanillin synthesized a novel imine-functionalized epoxy monomer (IDV-EP), and cured with diamino-diphenylmethane (DDM), 2-(4-aminophenyl)-1H-benzimidazol-5-amine (APBIA) and 4, 4-diamino benzoyl triphenylamine (DABA), respectively, for the purpose of building different contents of the sacrificial hydrogen-bonding clusters (SHBC) in topological network structures. As the hydrogen-bonding (H-bonding) binding energy of the crosslinked network increases, the strength and toughness of the resin were increased concurrently, SHBC was demonstrated to be a feasible method to achieve the strength-toughness trade-off of thermosets, in which IDV-EP-DABA illustrated a tensile strength of 90 MPa, an elongation at break of 16.5%, as well as toughness of 9.73 MJ/m 3 , which was higher than that of the ordinary bisphenol A-type epoxy thermosetting resin (DGEBA/DDM) by 1.8, 3.7 as well as 6.7 times, respectively. Furthermore, the covalent adaptive networks (CANs) formed by imine bonds provide the resins with effective capabilities for swift degradation (rapid degradation in acid/solvent, room temperature and static conditions) and reprocessing (only a slight decrease in the mechanical properties after hot pressed at 180°C/10 MPa for 15 minutes) , showcasing promising prospects for sustainable utilization.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 10
·1127
·
IF 2.935
Yinglei Zhai,Xing Zhou,Zhiqiang Zhang,Lei Zhang,Dianyu Wang,Xinhui Wang,Wei Sun
The side effects of doxorubicin (DOX) extremely limit its application in the treatment of malignant tumors. Nano-sized polymeric drugs based on the acidic microenvironment of tissular- or intra- tumor have attracted ample attention because of their potential in reducing side effects. In this research, an amphiphilic diblock copolymer based on poly (ethylene glycol) (PEG) and functionalized polycaprolactone (PCL) was synthesized and utilized as the drug carrier. DOX was chemically conjugated with the polymer via acid-cleavable imine bonds to obtain a novel pH-sensitive DOX prodrug (mPEG-PCL-Imi-DOX). mPEG-PCL-Imi-DOX (24.2 wt % DOX content) formed micelles with an average diameter of 125 nm through a simple solvent evaporation method. The in vitro release profile demonstrated that DOX release of the prodrug micelles was pH-responsive and able to be accelerated with the decrease of pH. In vitro cytotoxicity assay tests revealed that the pH-sensitive DOX prodrug micelles exhibited relatively lower toxicity and similar antitumor efficacy towards MCF-7 cells compared with free DOX. Hence, the DOX prodrug micelles with imine bonds can offer a carrier with great potential for chemo-therapeutics.Keywords:doxorubicin;pH-sensitive;prodrug;micelles;imine
研究领域:
药学
·
肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Jiaofeng Ye,Junxiang Zhang,Libang Feng,Haocheng Liu,Danbin Zhu,Yanhua Liu
The development of self-healing materials has enabled the production of more reliable and intelligent materials. However, resolving the conflict between mechanical strength and self-healing efficiency as well as limited repair options of the self-healing materials is still the most pressing scientific challenge. In this study, a self-healing polyurethane with multiple repair methods is prepared by introducing disulfide bonds into thermo-reversible imine bonds-based polyurethane . The resultant polyurethane exhibits impressive comprehensive mechanical properties and preeminent repair capabilities. More importantly, damages can be repaired through various routes such as room temperature, moderate temperature, hair dryer blowing, and ethylenediamine assistance treatments. The superior mechanical properties, repetitive self-healing performance, and multiple options for repair is attributed to the cooperation of thermally reversible imine and disulfide exchanges, thermal motion of molecular chains , and dissociation/regeneration of hydrogen bonds . So this research provides numerous ideal options for repairing cracks and other damages in materials used in construction industry under different usage environments. Consequently, high-quality repairs, improved efficiency, and extended service life of construction engineering materials can be ensured.
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
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yanhan Tao,Hui Yang,Zhijun Liu,Guoming Yuan,Kunxin Wang,Kun Wu,Jun Shi
One kind of liquid crystal monomer (LM) based on a biphenyl mesomorphic unit was synthesized from 4,4′-biphenyldicarboxaldehyde and 4-amino-3-methylphenol. Then two films (LM/TPTMP and LM/PETMP) were prepared by reacting the two thiols (TPTMP and PETMP) with the liquid crystal monomer (LM), respectively. These two films simultaneously exhibit intrinsically high thermal conductivity and intrinsic self-healing properties. Due to the presence of biphenyl liquid crystal units in LM and its highly symmetrical structure, a distinct nematic liquid crystal phase can be observed through a polarized optical microscope when heated to the liquid crystal phase transition temperature. The crystallite size of LM was calculated as 37 nm by an X-ray diffractometer (XRD). The films exhibit outstanding thermal conductivity, with LM/TPTMP achieving a thermal conductivity in the horizontal direction (λ∥) of 0.700 W/(m·K), which is significantly higher than that of epoxy resin-based intrinsic thermal conductivity materials in the range of 0.2–0.4 W/(m·K). The introduction of thiol flexible segments endowed the materials with good mechanical strength, with LM/PETMP demonstrating a tensile strength of 4.74 MPa and an elongation at break of 42.57%. Furthermore, the incorporation of dynamic imine bonds imparted excellent self-healing properties to the films. Specifically, LM/PETMP could retain 73% and 65.2% of its original tensile strength after one and three cycles of self-healing behavior, respectively. This type of high intrinsic thermal conductivity (λ) and excellent intrinsic self-healing performance film is expected to solve the problems of safety and service life of high-precision smart devices.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Yingbo Zhao,Fanrui Zhou,Kun Liang,Chunhua Wu,Xiaoping Rao,Qian Chen
In this study, a novel imine bond-based covalent triazine framework (CTF) with triazine groups as its backbone, designated as SWFU-CTFs-101 CTFs, was synthesized and utilized for the adsorption of Hg 2+ in an aqueous solution. The quasi-secondary kinetic model and Langmuir model indicate that the capture of Hg 2+ by the SWFU-CTFs-101 is a chemisorption process in a monomolecular layer. The maximum adsorption capacity of the material was determined to be 148.33 mg/g at a solid-liquid ratio of 1 mg/mL, an initial concentration of Hg 2+ of 400 mg/L, a pH of 6.0 and a temperature of 25°C. The adsorption mechanism of SWFU-CTFs-101 was elucidated by integrating experimental results, spectroscopic properties (SEM and XPS, etc.), and density functional theory (DFT) calculations. Notably, the adsorption capacity of SWFU-CTFs-101 in water remained largely stable after four cycles of recycling, indicating its promising potential for future practical applications.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shijie Tang,Yilin Lu,Qian Xu,Zhiping Chen,Ming Duan,Shenwen Fang
Imine bond is a kind of dynamic covalent bonds, in this paper, hydrophobic chain was introduced into polyethyleneimine (PEI) through imine bond, and a series of hydrophobic modified PEI were synthesized as flocculants for flotation-flocculation treatment of produced water. The hydrophobic modified PEI had much better flotation-flocculation performance than that of PEI. When the concentration was 20 mg/L and treatment was 10 min, the best hydrophobic modified PEI had the turbidity reduction rate of more than 95 %. Especially, in a short period of time, the flocs formed by the hydrophobic modified PEI can have a great decrease in adhesiveness under pH=4 due to the dissociation of imine bonds, which is good for the produced water treatment because the viscous flocs can be effectively processed. In addition, the mechanism study showed that the hydrophobic modified PEI can adsorb on the surfaces of bubbles and oil droplets to improve the collision efficiency and adhesion efficiency between bubbles and oil droplets, thus possessing good flotation-flocculation performance. This paper provides a novel degradable flocculant for produced water treatment.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2025
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IF 6.3
Long-Yang Zhan,Ping Li,Yi-Dong Li,Yin Ran,Jian-Bing Zeng
Biobased epoxy vitrimers (BEVs) offer a promising solution to the recyclability and resource challenges associated with traditional epoxy thermosets. However, numerous existing BEVs suffer from inadequate properties or complex fabrication processes. Herein, we present a fully biobased, high-performance epoxy vitrimer synthesized from renewable and commercially available feedstocks: resorcinol diglyceryl ether (DGER), vanillin (VAN), and 1,10-diaminodecane (DDA). A dynamic imine crosslinker (DIC) was synthesized from VAN and DDA, which then underwent solvent-free and catalyst-free melt curing with DGER to form the BEV. Detailed studies of the curing kinetics of DGER-DIC and the properties of the resulting BEV were conducted, with comparisons to a control fossil-based epoxy vitrimer made from bisphenol A diglycidyl ether (DGEBA) and DIC. The DGER-DIC system showed a curing activation energy of 62.43 ± 3.73 kJ·mol –1 , slightly lower than DGEBA-DIC’s 67.71 ± 2.38 kJ·mol –1 . The BEV exhibited excellent mechanical properties, featuring a tensile strength amounting to 69.23 MPa and a Young’s modulus at 1.91 GPa, along with high thermal stability. The imine bonds provided fast stress relaxation, self-healing performance, and excellent reprocessability, with tensile strength recovering over 90 % after multiple processing cycles. These properties rival those of the DGEBA derived epoxy vitrimers, highlighting the potential of DGER as a sustainable alternative for creating recyclable epoxy thermosets.
研究领域:
材料科学
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可持续化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·Vol. 17
·期 14
·e202301708
·
IF 7.5
Sujuan Zhang,Jianjun Yi,Jiming Chen,Yong Li,Baoliang Liu,Zaijun Lu
Graphical In this study, imine-containing polybenzoxazine vitrimer (C-ABZ) was synthesized through a condensation reaction between an aldehyde-containing benzoxazine oligomer (O-ABZ) and 1,12-dodecanediamine. The dynamic exchangeable characteristics of imine bonds impart C-ABZ with weldabilities and reprocessabilities. At the same time, the hydrophobic polybenzoxazine backbone significantly improve the water resistance of imine bonds. Traditional polybenzoxazine thermosets cannot be reprocessed or recycled due to the permanent crosslinked networks. The dynamic exchangeable characteristics of imine bonds can impart the networks with reprocessabilities and recyclabilities. This study reported a weldable, reprocessable, and water-resistant polybenzoxazine vitrimer (C-ABZ) crosslinked by dynamic imine bonds. It was synthesized through a condensation reaction between an aldehyde-containing benzoxazine oligomer (O-ABZ) and 1,12-dodecanediamine. The resulting C-ABZ was able to be welded and reprocessed due to the dynamic exchange of imine bonds. The tensile strengths of the welded C-ABZ and the reprocessed C-ABZ after three cycles of hot-pressing were 76.7, 81.3, 70.8, and 58.1 Mpa, with corresponding tensile strength recovery ratios of 74.1 %, 78.6 %, 68.4 %, and 56.1 %, respectively. Furthermore, the polybenzoxazine backbone significantly improved the water resistance of the imine bonds. After immersing in water for 30 days at room temperature, the weight gain of C-ABZ was less than 1 % with corresponding tensile strength and tensile strength retention ratio of 59.5 Mpa and 57.5 %, respectively. Although the heat resistance of C-ABZ decreased slightly with increased hot-pressing cycles, a glass transition temperature ( T g, tanδ ) of 150 °C was retained after the third hot-pressing. Overall, these findings demonstrate that the C-ABZ possesses excellent comprehensive performances.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2025
·Vol. 17
·期 5
·571
·
IF 4.9
Lei Chen,Na Ning,Gang Zhou,Yan Li,Shicheng Feng,Zhengyan Guo,Yi Wei
Conventional epoxy thermosets, with irreversible crosslinking networks, cannot be reprocessed and recycled. Furthermore, the utilization of petroleum-based materials accelerates the depletion of non-renewable resources. The introduction of dynamic covalent bonds and the use of bio-based materials for thermosets can effectively address the above issues. Herein, a series of bio-based epoxy vitrimers with dynamic covalent imine bonds were synthesized via a simple solvent-free, one-pot method using vanillin-derived aldehyde monomers, 4,4-diaminodiphenylsulfone (DDS) and bisphenol F diglycidyl ether (BFDGE) as raw materials. The effect of crosslinking density, crosslinking structure and imine bond content on the resulting bio-based vitrimers was studied, demonstrating their excellent thermal properties, UV shielding and solvent resistance, as well as outstanding mechanical properties compared to those of the previously reported vitrimers. In particular, the cured neat resin of vitrimer had a maximum tensile strength of 109 MPa and Young’s modulus of 6257 MPa, which are higher than those of previously reported imine-based vitrimers. The dynamic imine bonds endow these vitrimers with good reprocessability upon heating (over 70% recovery) and degradation under acidic conditions, enabling recycling by physical routes and gentle degradation by chemical routes. This study demonstrates a simple and effective process to prepare high-performance bio-based and recycled epoxy thermosets.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 9
·1262
·
IF 4.7
Peng Wang,Zhuochao Wang,Wenxin Cao,Jiaqi Zhu
Transparent polysiloxane elastomers with good self-healing and reprocessing abilities have attracted significant attention in the field of artificial skin and flexible displays. Herein, we propose a simple one-pot method to fabricate a room temperature self-healable polysiloxane elastomer (HPDMS) by introducing dynamic and reversible imine bonds and boroxine into polydimethylsiloxane (PDMS) networks. The presence of imine bonds and boroxine is proved by FT−IR and NMR spectra. The obtained HPDMS elastomer is highly transparent with a transmittance of up to 80%. The TGA results demonstrated that the HPDMS elastomer has good heat resistance and can be used in a wide temperature range. A lower glass transition temperature (Tg, −127.4 °C) was obtained and revealed that the elastomer is highly flexible at room temperature. Because of the reformation of dynamic reversible imine bonds and boroxine, the HPDMS elastomers exhibited excellent autonomous self-healing properties. After healing for 3 h, the self-healing efficiency of HPDMS reached 96.3% at room temperature. Moreover, the elastomers can be repeatedly reprocessed multiple times under milder conditions. This work provides a simple but effective method to prepare transparent self-healable and reprocessable polysiloxane elastomers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 28
·15733-15751
·
IF 4.22
Liu Xiaohong,Zhang Ending,Feng Zhiqiang,Liu Jiaming,Chen Bifang,Liang Liyan
Traditional epoxy resin materials are widely used in coatings, composite materials, electronic packaging materials, etc. They are usually made of unsustainable fossil resources and cannot be recycled under mild conditions. Degradable thermosetting resins with dynamic covalent structure provide a potential solution to this conflict. In this paper, using biomass energy vanillin, m-xylylenediamine and 1, 6-hexanediamine as raw materials, two dynamic imine bond curing agents were synthesized, and then cured with DGEBA to prepare two bio-based imine epoxy vitrimers. The thermal and mechanical properties of two imine epoxy vitrimers were studied and compared in detail. Results showed that the two types of polymers exhibit excellent thermal stability and solvent resistance. At the same time, the tensile strength, modulus and elongation at break were comparable to or even better than those of conventional bisphenol A epoxy resin. In addition, due to the hydrolysis of the dynamic imine bonds, vitrimers had degradable characteristic, and its degradation also exhibited temperature, solvent and acidity dependence. More importantly, the recyclable carbon fiber reinforced polymer composites made of these two vitrimers could be completely degraded under weak acid conditions, and the nondestructive recycling of carbon fiber composites could be realized. We envision that this vitrimers with simple process, excellent comprehensive properties and degradability will make it a potential candidate for applications in sustainable structural materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Kun Zhang,Yan Huang,Yin-Jing Shen,Lin-Feng Zhang,Shuang Ma,Ting-Ting Chen,Ziqiang Zheng,Shishen Zhang,Benxia Li
Herein, we report our strategy to develop the efficient chemosensor and real-time monitoring technique for cyanuric chloride (TCT) detection. A luminescent macrocyclic mononuclear Sm(III) complex Sm - 2 k bearing with two dynamic imine bonds has been constructed via the template synthesis between dialdehyde H 2 Q k and matched diamine 1,2-bis(2-aminoethoxy)ethane. Sensing experiments reveal that complex Sm - 2 k exhibits the turn-off fluorescent and colorimetric response for TCT in CH 3 OH. It is especially encouraging that this optical sensing process is not only rapid within 60 s but also high-efficient in the presence of TCT analogues as well as sensitive with the low limit of detection (LOD, 1.74 μM) and wide linear sensing range. Mechanism studies demonstrate that TCT sensing is mainly based on the imine bond transformation of probe Sm - 2 k , which is due to the increased acidity induced by TCT. Meanwhile, a smartphone-based analytical method was developed to make complex Sm - 2 k accessible for the real-time TCT detection by RGB value outputs. It is believed that this work can shed some constructive lights on design of chemosensors and convenient detection technique for highly reactive analytes.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）