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.
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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.
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HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Xiaofei Wang,Kaifeng Zhao,Xiaowen Huang,Xiaoyue Ma,Yanyan Wei
Over time, automotive coating is bound to be damaged; therefore, it is necessary to give the coating a self-healing ability to make its performance even better. First, furfuryl glycidyl ether (FGE) was synthesized by epichlorohydrin and furfuryl alcohol. Then, furanyl-terminated resin FGE-T5000 was synthesized by polyether amine T5000 and FGE. Finally, 4,4′-diphenylmethane bismaleimide (BDM) was added to FGE-T5000 as a cross-linking agent to form a resin named FGE-T5000-BDM which has Diels–Alder (DA) bonds. The products were characterized by Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance, differential scanning calorimeter, dynamic mechanical analysis, thermogravimetric analysis, optical microscope, tensile tests, and other tests. The results showed that FGE-T5000-BDM demonstrated thermally reversible self-healing property from 50°C to 150°C, and that the best temperature of the DA reaction was 80°C. The gel content of FGE-T5000-BDM was 98%. Also, the glass transition temperature and the initial temperature of the Retro-DA (r-DA) reaction were −58°C and 88°C, respectively. Moreover, the self-healing efficiency of FGE-T5000-BDM was up to 88% after staying at 80°C for 12 h. The innovation shown in this article was that the reversible covalent bonds (DA) were combined with the polyether amines, which produced the characteristics of self-healing. Its unique self-healing properties are useful in some areas, such as automobile coatings and other materials.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 3
·e70140
·
IF 3.4
Xianning Wang,Runqi Zhang,Lujia Xuan,Mengmeng Yu,Jianqing Mao,Gang Cheng,Jieqiong Yan,Hongzhen Wang
Covalent adaptable networks offer a viable approach for producing recyclable rubber materials. Nevertheless, the intricate synthesis process and insufficient mechanical strength limit their commercialization applications. In this study, the reinforced, thermal-healing, and recyclable chitosan/ethylene propylene diene rubber (CEF-CS) was synthesized using a solid-phase blending process via the Diels-Alder (D-A) reaction. Furfural modified chitosan (F-CS) was included as a reinforcing filler and dynamic cross-linking point into the network formed via the D-A reaction. The influence of F-CS content on the mechanical, thermomechanical, and thermal repair characteristics of CEF-CS composites was examined. The results showed that the CEF-CS composites exhibited certain mechanical strength and dependable repair capabilities. As the F-CS content increased, the tensile strength of CEF-CS composites initially rose and subsequently declined, reaching a peak of 5.1 MPa, which was 5.1 times more than the control without F-CS. The first healing efficiency of tensile strength exceeded 70%, whereas the second healing efficiency was above 60%. Moreover, the simple preparation procedure and enhanced mechanical strength facilitate the commercial utilization of recyclable rubber materials, which is crucial for addressing the environmental pollution issue associated with rubber materials.
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高影响因子
Science China-Technological Sciences
·
2025
·Vol. 68
·期 6
·1-16
·
IF 4.9
Yang Xuxuan,Zhang Qian,Nie Xiongfeng,Xu Ziyang,Liu Wenguang
The development of a meniscal substitute that conforms to the stringent requirements of high modulus, antiswelling, and shape compatibility continues to pose a significant challenge. Herein, the polycarbonate-based polyurethane (PCU) with a covalent adaptive network is constructed by introducing the Diels-Alder (DA) bonds into the hard segments of PCU as the dynamic covalent cross-linkage. On the one hand, the stability of DA bonds at low temperatures enables them to lock molecular chains within the hard domain in an aqueous environment, thus maintaining the high robustness of the resultant elastomer under physiological conditions. On the other hand, the incorporated DA bonds can be disrupted at high temperatures, facilitating the movement of the molecular chains through heating, thus allowing for the three-dimensional (3D) printing of the meniscus scaffold whose shape closely resembles that of the native tissue. The fabricated meniscus substitute is surgically implanted into the knee joints of rabbits for 12 weeks, with in-vivo outcomes illustratively showcasing its remarkable proficiency in mitigating cartilage surface degradation.
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高影响因子
PHYTOCHEMISTRY
·
2018
·
IF 3.186
Chun-Li Xia,Gui-Hua Tang,Yan-Qiong Guo,You-Kai Xu,Zhi-Shu Huang,Sheng Yin
Mulberry Diels-Alder-type adducts (MDAAs) are a group of structurally unique natural products biosynthetically derived from the intermolecular [4 + 2] cycloaddition of a dehydroprenylphenol and a chalcone . In the current study, ten MDAAs, including an undescribed one, inethermulberrofuran C, were isolated from the root bark of Morus alba . The anti-Alzheimer's disease (anti-AD) properties of these isolates were systematically screened for a series of potential targets (A β self-aggregation, tau aggregation, and ChEs) as well as the anti-neuroinflammatory and neuroprotective activities. Four compounds, mulberrofuran C, mulberrofuran K, mulberrofuran G, and isomulberrofuran G, turned out to be potent multi-targeted agents for AD. Among them, mulberrofuran K with a good blood-brain barrier (BBB) permeability (8.7 ± 0.3 × 10 −6 cm/s) was selected as a promising candidate for further mechanism study in glutamate-induced HT22 cell model, which showed its neuroprotective ability on up-regulation of the glutathione (GSH) level and suppression of the reactive oxygen species (ROS) production.
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PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 72
·58798-58803
·
IF 3.84
Wei He,Zheng Fang,Zhao Yang,Dong Ji,Kai Guo
The first direct aza-Diels–Alder reaction catalyzed using phosphotungstic acid combined with a water absorption device in a micro-flow system was reported. The optimization process gave azabicyclo[2.2.2]octan-5-ones in 98.78% conversion and an endo/exo ratio of 7/93. Exo cycloadducts were quickly prepared due to efficient mixing and heat transfer in the micro-flow system. However, exo products could be turned into endo cycloadducts which were more stable.
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高影响因子
Advanced Healthcare Materials
·
2025
·
IF 9.6
Linying Yan,Masoumeh Kianfar,Yuqian Liu,Yang Huang,Huining Xiao,Farzad Seidi
The development of injectable hydrogel wound dressings with inherent antibacterial and antioxidant properties for treating full-thickness skin injuries represents one of the most promising solutions in clinical care. In this study, a series of injectable hydrogels with tunable gelation times is designed and prepared through the Diels-Alder (DA) reaction between diene-functionalized quaternary cellulose and maleimide-grafted quaternary chitosan. The high degree of substitution of diene and maleimide groups on these polysaccharides enables the formation of highly crosslinked hydrogels. By fine-tuning the structure of the dienes, the gelation time can be reduced to 4 min at 37 ° C. Both precursors and hydrogels showed strong antibacterial activity with killing efficacies >98% against E. coli and S. aureus . Meanwhile, the encapsulation of epigallocatechin gallate (EGCG, a green tea derivative) endowed the hydrogel with strong antioxidant performance. Moreover, the hydrogel exhibited good biocompatibility with 100% cell viability for NIH3T3 cells. In vivo wound healing assessment in a mouse full-thickness skin defect model revealed that the optimum hydrogel exhibited significant collagen deposition and vascularization, as well as remarkable regenerative wound healing performance, demonstrating its great potential as a bio-based wound dressing for improving wound healing.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yunliang Jiang,Yumin Dong,Yong Xiong,Jun Li,Jianping Zhou,Hongbo Liang,Binghua Zhou,Bing Xie
To meet the non-removable application scenarios of most integrated electronics, the development of polymer-based packaging materials possessing superior thermal conductivity and self-healing characteristics simultaneously is necessary. However, on account of the complexity of composite structure and composition , its self-heal remains a formidable challenge. Herein, we have designed a self-healing and thermally conductive bi-functional polyurethane composites with Diels-Alder structure (PUDA) and silver nanowires (AgNWs). The hydrogen-bonding network at the interface of AgNWs and PUDA facilitated the dispersion of AgNWs in the matrix, which endows the composites with desirable thermal conductivity . Incorporating 3, 6, 9, 12, and 15 wt% of AgNWs into PUDA leads to increases in thermal conductivity of 33%, 104%, 154%, 321%, and 371%, respectively. In particular, the novel composites incorporated 12 wt% AgNWs exhibited the most efficient balance between self-healing efficiency and thermal conductivity performance. The thermal conductivity of PUDA/AgNWs with 12% of AgNWs content is 1.01 W/mK, which is 4.8 times that of PUDA (0.21 W/mK). After two reconstitution cycles, the thermal conductivity of PUDA/AgNWs-12 was restored to 85%. This study demonstrates the successful preparation of composites possessing both desirable thermal conductivity and self-healing capabilities, rendering them suitable for use as thermal interface materials in thermal management systems and flexible electronics applications.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 12
·5252-5262
·
IF 4.705
Cheng Bing-Xu,Lu Chen-Chen,Li Qing,Zhao Si-Qi,Bi Chang-Shun,Wu Wei,Huang Chong-Xing,Zhao Hui
A type of waterborne polyurethane (WPU) with excellent self-healing and recyclable properties was successfully prepared by introducing Diels–Alder (DA) reaction groups into it. FT-IR was used to verify the successful synthesis of samples and the retro-DA reaction in the WPU-DA films. It was found that the self-healing efficiency of the WPU-DA-4/4 films was 72.8%. After four cycle times, the self-healing efficiency could still achieve 49.7%. Moreover, the WPU-DA film could be applied as the positive friction layer to prepare a triboelectric nanogenerator (TENG). Working in contact-separation mode, the electrical outputs with 2 × 2 cm 2 area can reach 58 V, 3.2 µA, 17.6 nC, respectively. It is also interesting to find that the electrical output properties of the TENG after damage-healed can be restored to more than 90% of the original one. The cross-linked WPU had good reprocessability and had great potential application prospects in intelligent materials.
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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%.
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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.
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PubMed
高影响因子
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