Bibliographies thématiques / Epoxy-vitrimer

Littérature scientifique sur le sujet « Epoxy-vitrimer »

Auteur : Grafiati
Publié le 4 mai 2024

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Articles de revues sur le sujet "Epoxy-vitrimer"

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Feng, Yang, Zhuguang Nie, Panhong Deng, Liping Luo, Xingman Hu, Jie Su, Haiming Li, Xiaodong Fan et Shuhua Qi. « An Effective Approach to Improve the Thermal Conductivity, Strength, and Stress Relaxation of Carbon Nanotubes/Epoxy Composites Based on Vitrimer Chemistry ». International Journal of Molecular Sciences 23, no 16 (9 août 2022) : 8833. http://dx.doi.org/10.3390/ijms23168833.

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An effective method was developed to improve the interfacial interaction between Mutiwalled carbon nanotubes (MWCNTs) and epoxy matrix. The performance of thermal conductivity and strength of the epoxy vitrimer were enhanced by polydopamine (PDA) coating. Polydopamine is a commonly used photothermal agent, which of course, was effective in modifying MWCNTs used in photoresponsive epoxy resin. The surface temperature of the epoxy composite with 3% MWCNTs@PDA fillers added increased from room temperature to 215 °C in 48 s. The metal–catechol coordination interactions formed between the catechol groups of PDA and Zn2+ accelerated the stress relaxation of epoxy vitrimer. Moreover, the shape memory, repairing, and recycling of epoxy vitrimer were investigated. Therefore, dopamine coating is a multifunctional approach to enhance the performance of epoxy vitrimer.
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Bai, Heshan, Tianyu Zhao, Ruixiang Bai, Zhenkun Lei et Chen Liu. « Evaluation interfacial properties of resin with bond exchange reaction / T700 carbon fiber by micro-drop test and FEM ». Journal of Physics : Conference Series 2361, no 1 (1 octobre 2022) : 012006. http://dx.doi.org/10.1088/1742-6596/2361/1/012006.

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Vitrimer epoxy resin is a newly developed resin with bond exchange reaction, which has potential applications in the field of recyclable fiber composites. The force-displacement curve of T700 carbon fiber monofilament pulled out from Vitrimer epoxy microdroplet was obtained by the microdrop test, and the interfacial shear strength of the composite system was obtained. Based on the cohesive contact theory, the finite element model (FEM) of the micro-drop test was set up. The calculated force-displacement curve is consistent with experimental data. The fracture strength and parameter characterization of the interface between Vitrimer epoxy and carbon fiber composites are further discussed.
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Legrand, Aurélie, et Corinne Soulié-Ziakovic. « Silica–Epoxy Vitrimer Nanocomposites ». Macromolecules 49, no 16 (5 août 2016) : 5893–902. http://dx.doi.org/10.1021/acs.macromol.6b00826.

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Ran, Yin, Ling-Ji Zheng et Jian-Bing Zeng. « Dynamic Crosslinking : An Efficient Approach to Fabricate Epoxy Vitrimer ». Materials 14, no 4 (15 février 2021) : 919. http://dx.doi.org/10.3390/ma14040919.

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Epoxy vitrimers with reprocessability, recyclability, and a self-healing performance have attracted increasingly attention, but are usually fabricated through static curing procedures with a low production efficiency. Herein, we report a new approach to fabricate an epoxy vitrimer by dynamic crosslinking in a torque rheometer, using diglycidyl ether of bisphenol A and sebacic acid as the epoxy resin and curing agent, respectively, in the presence of zinc acetylacetonate as the transesterification catalyst. The optimal condition for fabricating the epoxy vitrimer (EVD) was dynamic crosslinking at 180 °C for ~11 min. A control epoxy vitrimer (EVS) was prepared by static curing at 180 °C for ~11 min. The structure, properties, and stress relaxation of the EVD and EVS were comparatively investigated in detail. The EVS did not cure completely during static curing, as evidenced by the continuously increasing gel fraction when subjected to compression molding. The gel fraction of the EVD did not change with compression molding at the same condition. The physical, mechanical, and stress relaxation properties of the EVD prepared by dynamic crosslinking were comparable to those of the EVS fabricated by static curing, despite small differences in the specific property parameters. This study demonstrated that dynamic crosslinking provides a new technique to efficiently fabricate an epoxy vitrimer.
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Jing, Fan, Ruikang Zhao, Chenxuan Li, Zhonghua Xi, Qingjun Wang et Hongfeng Xie. « Influence of the Epoxy/Acid Stoichiometry on the Cure Behavior and Mechanical Properties of Epoxy Vitrimers ». Molecules 27, no 19 (26 septembre 2022) : 6335. http://dx.doi.org/10.3390/molecules27196335.

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Bisphenol A epoxy resin cured with a mixture of dimerized and trimerized fatty acids is the first epoxy vitrimer and has been extensively studied. However, the cure behavior and thermal and mechanical properties of this epoxy vitrimer depend on the epoxy/acid stoichiometry. To address these issues, epoxy vitrimers with three epoxy/acid stoichiometries (9:11, 1:1 and 11:9) were prepared and recycled four times. Differential scanning calorimetry (DSC) was used to study the cure behavior of the original epoxy vitrimers. The dynamic mechanical properties and mechanical performance of the original and recycled epoxy vitrimers were investigated by using dynamic mechanical analysis (DMA) and a universal testing machine. Furthermore, the reaction mechanism of epoxy vitrimer with different epoxy/acid stoichiometry was interpreted. With an increase in the epoxy/acid ratio, the reaction rate, swelling ratio, glass transition temperature and mechanical properties of the original epoxy vitrimers decreased, whereas the gel content increased. The recycling decreased the swelling ratio and elongation at break of the original epoxy vitrimers. Moreover, the elongation at break of the recycled epoxy vitrimers decreased with the epoxy/acid ratio at the same recycling time. However, the gel content, tensile strength and toughness of the original epoxy vitrimers increased after the recycling. The mechanical properties of epoxy vitrimers can be tuned with the variation in the epoxy/acid stoichiometry.
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Ruiz de Luzuriaga, Alaitz, Nerea Markaide, Asier M. Salaberria, Itxaso Azcune, Alaitz Rekondo et Hans Jürgen Grande. « Aero Grade Epoxy Vitrimer towards Commercialization ». Polymers 14, no 15 (4 août 2022) : 3180. http://dx.doi.org/10.3390/polym14153180.

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Traditional crosslinked aero grade epoxy resins have excellent thermal-mechanical properties and solvent resistance, but they cannot be remolded, recycled, or repaired. Vitrimers can be topologically rearranged via an associative exchange mechanism, endowing them with thermoplasticity. Introducing dynamic bonds into crosslinked networks to obtain more sustainable thermosets is currently an interesting research topic. While recent research into vitrimers has indicated many advantages over traditional thermosets, an important shortcoming has been identified: susceptibility to creep at service temperature due to the dynamic bonds present in the network. In addition, designing aero grade epoxy vitrimers (similar to RTM6 resin) still remains a challenge. Herein, low creep aero grade epoxy vitrimer with thermal and mechanical properties similar to those of aero grade epoxy resins and with the ability to be recyclable, repairable, and reprocessable, has been prepared. In this manuscript, we demonstrate that aero grade epoxy vitrimer with reduced creep can be easily designed by the introduction of a certain fraction of permanent crosslinks, without having a negative effect on the stress relaxation of the material. Subsequently, the mechanical and relaxation properties were investigated and compared with those of classical aero grade epoxy resin. A high Tg (175 °C) epoxy vitrimer was obtained which fulfilled all mechanical and thermal specifications of the aero sector. This work provides a simple network design to obtain aero grade epoxy resins with excellent creep resistance at elevated temperatures while being sustainable.
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Zeng, Yanning, Jiawei Li, Shuxin Liu et Bin Yang. « Rosin-Based Epoxy Vitrimers with Dynamic Boronic Ester Bonds ». Polymers 13, no 19 (1 octobre 2021) : 3386. http://dx.doi.org/10.3390/polym13193386.

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Rosin is an abundantly available natural product. In this paper, for the first time, a rosin derivative is employed as the main monomer for preparation of epoxy vitrimers to improve the mechanical properties of vitrimers. Novel epoxy vitrimer networks with dynamic reversible covalent boronic ester bonds are constructed by a reaction between thiols in 2,2′–(1,4–phenylene)–bis (4–mercaptan–1,3,2–dioxaborolane) (BDB) as a curing agent and epoxy groups in the rosin derivative. The rosin-based epoxy vitrimer networks are fully characterized by Fourier transform infrared spectroscopy (FTIR), an equilibrium swelling experiment, and dynamic mechanical analysis (DMA). The obtained rosin-based epoxy vitrimers possess superior thermostability and good mechanical properties. Due to transesterification of boronic ester bonds, rosin epoxy vitrimer network topologies can be altered, giving welding, recycle, self-healing, and shape memory abilities to the fabricated polymer. Besides, the effects of treating time and temperature on welding capability is investigated, and it is found that the welding efficiency of the 20% C-FPAE sample is >93% after treatment for 12 h at 160 °C. Moreover, through a hot press, the pulverized samples of 20% C-FPAE can be reshaped several times and most mechanical properties are restored after reprocessing at 200 °C for 60 min. Finally, chemical degradation is researched for the rosin-based epoxy vitrimers.
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Lian, Weiqiang, Huipeng Han, Xiaoxin Zhang, Guirong Peng, Zhaojing Jia et Zhenlin Zhang. « Polyurethane modified epoxy vitrimer and its stress relaxation behavior ». Journal of Polymer Engineering 41, no 5 (5 avril 2021) : 365–74. http://dx.doi.org/10.1515/polyeng-2020-0328.

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Abstract Anhydride cured epoxy vitrimers usually exhibit desired mechanical strength but poor toughness and slow transesterification rate. Therefore, the repairing property of the material was restricted. In this paper, polyurethane modified epoxy vitrimer (PU-Epv) was prepared. PU was introduced into the vitrimer system of tetrahydrophthalic anhydride cured epoxy to improve the toughness of the material. Meanwhile, because of the presence of amino ester, the transesterification reaction was promoted and the activation energy of the transesterification was only 33.59 kJ/mol. In the thermal welding experiment, the material could be welded at least five times, and scratches on the surface of the samples could be efficiently repaired within 30 min. The toughness of the material was improved without damaging the strength. Meanwhile, the hard thermosetting epoxy was endowed with excellent repairing properties to increase the service life of the material.
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Shi, Qian, Kai Yu, Xiao Kuang, Xiaoming Mu, Conner K. Dunn, Martin L. Dunn, Tiejun Wang et H. Jerry Qi. « Recyclable 3D printing of vitrimer epoxy ». Materials Horizons 4, no 4 (2017) : 598–607. http://dx.doi.org/10.1039/c7mh00043j.

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Han, Haiping, et Xuecheng Xu. « Poly(methyl methacrylate)-epoxy vitrimer composites ». Journal of Applied Polymer Science 135, no 22 (13 février 2018) : 46307. http://dx.doi.org/10.1002/app.46307.

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Thèses sur le sujet "Epoxy-vitrimer"

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Castro, Cabrera Isis. « Epoxy vitrimer materials based on disulfide exchange chemistry : experimental study and modeling of the stress relaxation - application to composites reinforced by nanofibrillated cellulose ». Electronic Thesis or Diss., Toulon, 2021. http://www.theses.fr/2021TOUL0010.

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Les résines époxy thermodurcissables ont attiré l'attention de nombreuses industries en raison de leur polyvalence, des adhésifs aux matériaux composites. Malgré leur versatilité, le recyclage, la durabilité et développement durable de ces thermodurs majoritairement pétrosourcés limitent leur utilisation. Des réseaux adaptables covalents (CAN) comme les vitrimères peuvent offrir une solution pour faire face à ces problèmes. Le système époxy DGEBA‒4-APDS, basé sur la chimie d'échange de disulfures, a montré des propriétés de recyclabilité, mais son comportement vitrimère n'a pas été encore complètement vérifié. Dans le présent travail, toutes les propriétés propres aux vitrimères sont étudiées afin de s’assurer du caractère vitrimère de ce matériau. De façon intéressante, la température d’échange des liaisons réversibles propre aux vitrimères (Tv) est proche de la transition vitreuse du matériau (Tg). Il en découle que sa relaxation, qui s’opère légèrement au-dessus de sa Tg, est influencée à la fois par les réactions d'échange des liaisons réversibles et par la relaxation du polymère en lui-même. De ce fait, il est proposé un modèle adapté de relaxation des contraintes qui prend en compte ces deux phénomènes. Ce modèle rhéologique a permis également d'évaluer la relaxation de cette matrice époxy-vitrimère renforcée par des nanofibrilles de cellulose (NFC). Ce composite vitrimère à base de NFC est un matériau léger durable et présentant des propriétés mécaniques similaires à celles des réseaux covalents non-adaptables. Une étude initiale pour augmenter la durabilité de ce vitrimère époxy a consisté à modifier la surface de la NFC par un agent de couplage glycidoxy silane. Une méthode simple de greffage des NFC est proposée, et la caractérisation du réseau silane entourant les NFC a été réalisée
Epoxy thermoset resins have drawn the attention of many industries due to their versatility, from adhesives to polymer composites. Yet, the re-processability, sustainability, and durability of resins limit their use. The covalent adaptable networks (CANs) like vitrimers can afford a solution to overcome these issues. The epoxy resin, DGEBA‒4-APDS, based on the disulfide exchange chemistry, has shown re-processability properties, but its vitrimer properties have not been fully verified. In the present work, all the vitrimer properties are reviewed to classify it as a vitrimer material. Interestingly, the vitrimer exchange operating temperature (Tv) is close to its glass transition (Tg). So, its relaxation behavior, slightly above Tg, is influenced by the bond exchange reactions and the segmental relaxations of the network. Thus, an adapted stress relaxation model that considers both relaxation phenomena is proposed. This developed rheological model leads to evaluate the epoxy vitrimer matrix reinforced by nano fibrillated cellulose (NFC). The vitrimer composite made with NFC performs a sustainable lightweight material and exhibits mechanical properties similar to non-covalent adaptable networks. A preliminary study to increase material durability has consisted in the NFC surface modification by glycidoxy silane coupling agent. A simple NFC grafting method is proposed, and the surface characterization of the silane network surrounding the NFC is well-explored
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Chapitres de livres sur le sujet "Epoxy-vitrimer"

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Yang, Yang, Yen Wei et Yan Ji. « Epoxy Vitrimer Composites ». Dans Functional and Sustainable Epoxy Vitrimers, 27–39. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15082-1_4.

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Actes de conférences sur le sujet "Epoxy-vitrimer"

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SINGH ROHEWAL, SARGUN SINGH, JIHO SEO, NIHAL KANBARGI et AMIT K. NASKAR. « RECYCLABLE CELLULOSE FIBER REINFORCED VITRIMER COMPOSITE ». Dans Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36699.

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Vitrimer is an innovative class of polymeric materials which demonstrates traditional thermoset-like mechanical and chemical resilience while still being able to flow on demand like a traditional thermoplastic through covalently adaptive dynamic linkages. Herein, high-performance cellulose fiber reinforced vitrimer composites are developed using an epoxy-based vitrimer and natural cellulose paper. The reinforced vitrimer composite was fabricated by impregnating the porous structure of cellulose paper with two curable monomers, followed by in-situ polymerization of the monomers inside the fibrous scaffold. The introduction of hydroxyl group present on the cellulosic framework assisted in a faster topological rearrangement of the crosslinked matrix through transesterification exchange reaction, thus imparting various sought-after properties like shape recovery and recyclability via simple thermal reprocessing. Moreover, the reinforced vitrimer composite exhibits superior tensile properties as high as 90 MPa with 15-25 volume% vitrimer loading due to the interfacial adhesion via ester exchange reaction between the epoxy matrix and functionalities on the cellulosic fibers. Noteworthily, the key ingredients of the resulting composite (i.e., epoxy-based vitrimer and cellulose fibers) can be comfortably recycled without using aggressive chemical treatment, enabling composite to be easily recycled or disposed of at the end of service life and assist in reducing the subsequent manufacturing cost. This study would shed light on the development of a recyclable polymer composite with exceptional mechanical properties while simultaneously demonstrating self-healing and shape memory capabilities.
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VISCUSI, A. « Metallization of Vitrimers by cold spray : A preliminary study ». Dans Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-20.

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Abstract. Cold spray is a promising solution for the production of metallic coatings on polymer substrates. However, the adhesion mechanism between the impacting particle and the polymer in cold spraying depends on the chemical structure of the polymer itself. In this scenario, the emerging vitrimer polymers, which were proved to combine enhanced mechanical and chemical performances with abilities to be healed, welded, reprocessed, and recycled and that show a ductile behavior when exposed to given operating temperatures, can be particularly suitable for being functionalized by cold spray. Therefore, the aim of this work is to experimentally prove the feasibility of the metallization process via cold spray of epoxy vitrimer substrates. For this purpose, an epoxy vitrimer formulation was studied and experimentally characterized. Vitrimer-based panels were manufactured and used as substrates for the surface metallization. A low-pressure cold spray facility was used for the deposition of aluminum alloy particles. Microscope analyses were carried out for the characterization of the samples.
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Hechen, Liu, Sun Zhanglin, Liu Yunpeng, Ge Qi et Wu Xuan. « Synthesis and Performance Study of Vitrimer Epoxy Resin Castables ». Dans 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961365.

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PALMIERI, B. « Viscoelastic characterization of reformable epoxy vitrimers composites ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-202.

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Abstract. Epoxy Vitrimers are gathering attention as a development in the field of more easily re-processable and self-healing thermosets. Incorporating a catalyst should activate the transesterification reaction within the polymeric macromolecule inducing topological modification of the network. Reacting epoxy precursors with suitable anhydrides and acids will promote exchange reactions between esters and beta-hydroxyls, adding the vitrimeric behaviour. In the present work, a commercial epoxy system suitable for CFRP manufacturing has been modified to induce vitrimeric behaviour by exploiting the catalytic activity towards the transesterification reaction of Zn2+. Creep experiments confirm that the resin starts to flow above a critical “Vitrimeric” temperature (Tv). Moreover, the thermoformability of vitrimer-CFRP has been investigated by reprocessing CFRP coupons.
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Kamble, Mithil, Nikhil Koratkar et Catalin Picu. « Vitrimer Composites for Rotorcraft Components ». Dans Vertical Flight Society 77th Annual Forum & Technology Display. The Vertical Flight Society, 2021. http://dx.doi.org/10.4050/f-0077-2021-16896.

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Carbon fiber reinforced composites (CFRP) are frequently used in rotorcraft components due to their high strength to weight ratio. Carbon fibers are the principal load carriers whereas polymer matrix provides structural integrity to the CFRP components. Fatigue failure originating in the matrix pose a design constraint on CFRP components. The fatigue failure originates in form of small scale sub-critical cracks which eventually grow into macroscopic cracks/shear localization resulting in eventual failure. Research efforts have been directed at improving fracture and fatigue performance of polymeric matrix by arresting incipient cracks. Thermoset polymers are widely used as matrix material as they posses superior strength due to high crosslinking density. However, since no self-healing mechanism operates in thermosets, damage is irreversibly accumulated over the life cycle of components. A new class of materials called vitrimers provide a novel approach to develop fatigue resistant CFRP. Vitrimers are associative covalent adaptive networks (CAN) which have reversible crosslinking reactions which can be activated by external energy stimulus like heat. As the crosslinked network is reversible, the incipient damage can be 'healed' by application of heat. In this work we explore the self-healing properties of vitrimer fabricated by the reaction of adipic acid and epoxy resin. The vitrimer is initially tested in static tests to probe mechanical properties, followed by fatigue experiments. The vitrimer is then used to make a vitrimeric CFRP (vCFRP) composite and is tested for its static and fatigue performance.
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Panagiotopoulos, Christos, Dimitrios Korres et Stamatina Vouyiouka. « Vitrimerization of Poly(butylene succinate) By Reactive Melt Mixing Using Zn(II) Epoxy-Vitrimer Chemistry ». Dans IOCPS 2021. Basel Switzerland : MDPI, 2021. http://dx.doi.org/10.3390/iocps2021-11588.

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Kamble, Mithil, Sikharin Pranompont, Catalin Picu et Nikhil Koratkar. « Vitrimer Carbon Fiber Composites for Rotorcrafts Components with Fatigue Reverse Ability ». Dans Vertical Flight Society 78th Annual Forum & Technology Display. The Vertical Flight Society, 2022. http://dx.doi.org/10.4050/f-0078-2022-17617.

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As rotorcrafts enter new generation of their design, they are expected to be subjected to more stringent performance requirement, Increased loads and operational frequency necessitates use of structural components with higher fatigue life. Carbon fiber reinforced polymer composites (CFRP) are popular as structural material due to their superior performance while being lightweight. However, fatigue originating in weaker polymer limits their fatigue life, moreover the fatigue damage introduced accumulated irreversibly resulting in catastrophic failure. The damage is irreversible due to permanent crosslinked nature of thermoset polymers used in CFRP. If the crosslinks are made dynamic i.e. reversibly crosslinked, the fatigue damage may be reversed imparting ultra-high fatigue life to the components. Vitrimers are such epoxy based networks which may be ideal candidate for this application as they possess ability to dynamic crosslinking at elevated characteristic temperature. Here we report a vitrimer based CFRP i..e., vCFRP which has properties comparable to conventional CFRP which has ability to retain its original properties in fatigue tests when they are subjected to periodic heating. The fractographic analysis suggests that periodic heating serves dual purpose of enabling dynamic crosslinking as well as repairing small scale fiber-matrix interface failure. Thus, rotorcraft components made with vCFRP may have very high fatigue life compared to conventional CFRP components.
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