Article
Chemistry, Applied
Xiaowei An, Yi Ding, Ying Xu, Jian Zhu, Chunyang Wei, Xiangqiang Pan
Summary: The cross-linked structure of thermosetting carbon fiber composites poses challenges for their degradation and recycling. However, by introducing diselenide bonds, it is possible to create a new vitrimer material with plasticity and reprocessability, as well as recyclable carbon fiber reinforced composites.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Chemistry, Multidisciplinary
Doo Hun Kim, Ayeong Yu, Munju Goh
Summary: The study presents a method for decomposing the cross-linked epoxy (EP) resin of CFRPs in the presence of a potassium permanganate (KMnO4) solution, and investigates the decomposition mechanism and reaction rate constant. Experimental results show that this method is effective in reclaiming high-quality carbon fibers from CFRP scrap.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Rocio L. Perez, Caitlan E. Ayala, Michelle M. Opiri, Abdulrahman Ezzir, Guoqiang Li, Isiah M. Warner
Summary: A solvent-based green recycling procedure using ionic liquids and alcohols was reported for the recycling of thermoset epoxy resins and carbon fiber reinforced epoxy composites under mild conditions. The study evaluated the swelling and depolymerization capacity of the materials in the presence of different alkyl-methyl-imidazolium ILs and alcohols. Complete dissolution of both TERs and CFRECs was achieved in 150 minutes at 150 degrees Celsius under atmospheric pressure. Recovery and reuse of the recycled monomer after dissolution were also examined, demonstrating similar mechanical properties to the parent TER and successful recovery of carbon fibers from CFRECs.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Engineering, Manufacturing
Zimeng Zhang, Ruochen Liu, Wei Li, Yuchen Liu, Haochen Luo, Li Zeng, Jingjing Qiu, Shiren Wang
Summary: This study demonstrates the printing and in-situ curing of epoxy resin-based thermosets and composites using self-sustaining frontal propagation. By adjusting the concentration of latent initiator in the resin, the curing temperature was lowered without affecting the reaction rate. The printed continuous carbon fiber/thermoset composites (c-CFTC) showed exceptional tensile strength and significant energy savings compared to conventional manufacturing processes.
ADDITIVE MANUFACTURING
(2021)
Article
Polymer Science
Shasha Tang, Haidan Lin, Kai Dong, Jun Zhang, Chengji Zhao
Summary: This paper presents a novel guaiacol-based epoxy resin prepared from renewable resources, which showed good thermal stability and mechanical properties. The carbon fiber reinforced composites using this resin could be efficiently dissolved and recycled in a closed loop, without altering the carbon fibers. This work contributes to the development of guaiacol-based renewable functional materials and provides a feasible and economical way for recycling and reprocessing carbon fiber reinforced epoxy composites.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Engineering, Environmental
Xu Zhao, Xue Zhao, Wenli An, Yuwei Long, Xuehui Liu, Li Chen, Shimei Xu, Yu-Zhong Wang
Summary: Chemcycling of waste plastics aims to achieve efficient degradation and utilization of degradation products. This study presents a chemical upcycling strategy for waste anhydride-cured epoxy thermosets, where the thermosets are degraded using an alkali/alcohol system to obtain two degradation products with a yield of about 90%. These products are then modified into new epoxy monomer and curing agent, directly used for preparing high-performance epoxy thermosets. The degradation products account for more than 80% of the new epoxy thermoset.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Materials Science, Multidisciplinary
Zi-shang Tian, Yu-qi Wang, Xiang-lin Hou
Summary: The methods of chemical recycling of CFRCs have been investigated, and the synthesis and depolymerization mechanism of recyclable thermosetting resins by the insertion of reversible chemical bonds have been explored. This research is of great significance for the recycling and reuse of CFRCs.
NEW CARBON MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xi Yang, Yindong Wang, Xiaokang Zhang, Zhiwen Jian, Xili Lu, Zhanhua Wang, Hesheng Xia
Summary: In this study, acylsemicarbazide (ASC) moieties are introduced into a network to obtain a dynamic reversible cross-linked thermoset epoxy resin. The optimized epoxy resin shows excellent reprocessing performance and can be used to prepare carbon fiber reinforced polymer composites. The study provides a solution for recycling carbon fiber composites in line with a circular economy.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Engineering, Environmental
Haifeng Xu, Jiarui Hu, Xin Liu, Huanghu Wu, Yu Jiang, Zejun Xu, Sufang Chen, Tingcheng Li, Junheng Zhang, Daohong Zhang
Summary: In this study, thiol-terminated hyperbranched polyimides (DSPI-n) were synthesized and covalently grafted onto the surface of pristine carbon fiber fabric (PCF) to produce thiol-functionalized carbon fiber fabric (TCF). The degradable imide skeleton hyperbranched epoxy resin (DIHE-n) was then synthesized from DSPI-n to prepare the DIHE-n/TCF composites. The DIHE-n/TCF composites exhibited significantly improved mechanical properties and could be completely degraded under mild conditions, allowing for intact recycling of the carbon fiber fabric. This study provides a new approach for the preparation of recyclable and high-performance EP/CF composites.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Polymer Science
Elisabetta Morici, Nadka Tz Dintcheva
Summary: Thermoset materials and their composites have important applications in aircraft, wind turbines, and constructions, and the interest in their recycling is growing. Successful recovery and valorization of these materials require degradation of their structures and recovery of valuable components. This mini-review focuses on the formulation and recovery methods of innovative thermoset materials with built-in recyclability. The aim is to provide an overview of thermoset recycling and commonly used composites, as well as novel formulating strategies. This review is also a valuable guide for students and technicians in polymer production and recycling.
Article
Materials Science, Textiles
Lianwei Ye, Ke Wang, Hai Feng, Yu Wang
Summary: Through the use of a benzyl alcohol/alkaline system, efficient recycling of carbon fiber-reinforced epoxy resin-based composites was achieved with successful degradation and separation, resulting in clean carbon fibers with maintained mechanical properties.
FIBERS AND POLYMERS
(2021)
Article
Materials Science, Composites
Larissa Stieven Montagna, Fabio Augusto Passos De Almeida, Larissa Anne Pereira dos Santos Batista, Erick Gabriel Ribeiro Dos Anjos, Tayra Rodrigues Brazil, Guilherme Ferreira de Melo Morgado, Mauricio Ribeiro Baldan, Fabio Roberto Passador
Summary: This study aims to explore the mechanical recycling of CF/epoxy composites for nobler applications and found that adding 30% of CFRPres. to the PP matrix significantly increases electrical conductivity and elastic modulus. This makes it suitable for applications where impact strength, rigidity, and hardness are crucial.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Kaiyue Deng, Chunyan Zhang, Kun (Kelvin) Fu
Summary: Research on composite additive manufacturing has increased in recent years. Current commercial equipment can only fabricate carbon fiber composites using limited thermoplastic or rapid curable resins, which cannot meet a wide range of mechanical and durability requirements. In this study, a Rapid Interlayer Curing Assisted (RICA) 3D printing strategy was developed to enable the use of any commercially available thermally curable resin and fibers for 3D printed composites. A robotic system consisting of a specially designed end effector and automated robot arm was created to print continuously reinforced thermally curable thermoset composites.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Polymer Science
Yuli Wang, Bihui Jin, Dezhan Ye, Zengjin Liu
Summary: This study carefully examined the effects of four curing agents on the properties of vanillin-based epoxy vitrimers, with Isophoronediamine showing superior tensile strength and Young's Modulus compared to other epoxy vitrimers. The completely recyclable vanillin-based epoxy vitrimers achieved through imine exchange reaction have slightly inferior mechanical and thermal properties, but offer potential for the development of lignin-based functional materials.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Environmental Sciences
Seyed Hossein Mamanpush, Hui Li, Azadeh Tavousi Tabatabaei, Karl Englund
Summary: The study successfully developed a second-generation composite using recycled carbon fiber composites, with findings showing that adding thermoset CFCs to the thermoplastic system can enhance the flexural properties of composites.
WASTE AND BIOMASS VALORIZATION
(2021)
Article
Chemistry, Applied
Chenglong Yu, Zejun Xu, Xu Ma, Junheng Zhang, Sufang Chen, Menghe Miao, Hongxiang Chen, Daohong Zhang
Summary: EHPI-n polymers can significantly improve the performance of composite materials, including toughness, mechanical properties, heat resistance, and cold resistance, with great potential for various applications.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Chemistry, Physical
Qiufan Wang, Xuan Ran, Wenke Shao, Menghe Miao, Daohong Zhang
Summary: The article introduces a strategy to design novel electrodes with high conductivity and mechanical stability by using CoSe2 nanosheets and CNT films, providing efficient pathways for electron/ion diffusion.
JOURNAL OF POWER SOURCES
(2021)
Article
Polymer Science
Liuyue Zhong, Yanxin Hao, Junheng Zhang, Fang Wei, Tingcheng Li, Menghe Miao, Daohong Zhang
Summary: This study synthesized a ferulic acid-based hyperbranched epoxy resin (FEHBP) to produce closed-loop recyclable and catalyst-free epoxy vitrimers with improved mechanical performance. The incorporation of FEHBP enhanced the tensile strength and toughness of the epoxy vitrimers through an in situ reinforcing and toughening mechanism. The hydroxyls of FEHBP catalyzed the dynamic transesterification and accelerated the reprocessing of epoxy vitrimers.
Article
Chemistry, Multidisciplinary
Neng Yang, Yu Jiang, Qinwen Tan, Jiahui Ma, Dezhi Zhan, Zhaohong Wang, Xin Wang, Daohong Zhang, Nikos Hadjichristidis
Summary: An efficient one-pot strategy for the structure-controlled synthesis of hyperbranched polymers (HBPs) has been developed. By using a latent inimer and regulating the temperature or stereochemistry, the release of maleimide (MI) and subsequent copolymerization can be controlled, leading to the synthesis of HBPs with various degrees of branching.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yu Jiang, Jiahui Ma, Ziyu Ran, Huiqing Zhong, Daohong Zhang, Nikos Hadjichristidis
Summary: This research presents a versatile strategy for smart fluorescent materials, which can exhibit multi-stimuli-responsive behavior through a stage-by-stage response. The material, composed of blended linear polymers and AIE cross-linkers, forms networks under stimuli and restricts molecular rotation to induce strong emission. This unified stimuli-responsive mechanism ensures compatibility and adjustability of different stimulus-response behaviors.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yu Jiang, Huiqing Zhong, Qinwen Tan, Dezhi Zhan, Aolin Wang, Daohong Zhang
Summary: A new type of responsive hydrogel was created by utilizing the hydrophobic aggregation of strained 1,2-dithiolane rings, showing self-reinforcement and self-healing capacity. Oligomerization of 1,2-dithiolane within hydrophobic domains under UV irradiation not only reinforced the hydrogel but also maintained its dynamic cross-linked nature by converting the intraring dynamic S-S bond to an outer one.
CHEMICAL COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Hai Zhu, Chao Zhi, Jiaguang Meng, Yongzhen Wang, Yaming Liu, Liang Wei, Sida Fu, Menghe Miao, Lingjie Yu
Summary: In this study, a novel self-pumping dressing (FAED) with multiple liquid transport channels is designed, which can rapidly remove excess biofluid from the wound and provide good ventilation and wetting effect. It also has the characteristics of adapting to body contours and providing good supporting performance, making it a promising option for wound treatment and intensive care.
MACROMOLECULAR BIOSCIENCE
(2023)
Article
Engineering, Environmental
Haifeng Xu, Jiarui Hu, Xin Liu, Huanghu Wu, Yu Jiang, Zejun Xu, Sufang Chen, Tingcheng Li, Junheng Zhang, Daohong Zhang
Summary: In this study, thiol-terminated hyperbranched polyimides (DSPI-n) were synthesized and covalently grafted onto the surface of pristine carbon fiber fabric (PCF) to produce thiol-functionalized carbon fiber fabric (TCF). The degradable imide skeleton hyperbranched epoxy resin (DIHE-n) was then synthesized from DSPI-n to prepare the DIHE-n/TCF composites. The DIHE-n/TCF composites exhibited significantly improved mechanical properties and could be completely degraded under mild conditions, allowing for intact recycling of the carbon fiber fabric. This study provides a new approach for the preparation of recyclable and high-performance EP/CF composites.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yu Jiang, Dezhi Zhan, Meng Zhang, Ying Zhu, Huiqing Zhong, Yangfei Wu, Qinwen Tan, Xinhua Dong, Daohong Zhang, Nikos Hadjichristidis
Summary: A novel family of strong and ultra-tough ionic hydrogels was fabricated using a carboxyl-functionalized and acryloyl-terminated hyperbranched polycaprolactone (PCL) as a macro-cross-linker. The hydrogels exhibited high mechanical strength, superior toughness, and good ionic conductivity, making them suitable for flexible strain sensors. The hyperbranched PCL structure played a crucial role in enhancing the hydrogel properties, providing an optimal balance of covalent and non-covalent cross-linking.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Tong Li, Zhouhao Wang, Junping Hu, Haobin Song, Yuling Shi, Yu Jiang, Daohong Zhang, Shaozhuan Huang
Summary: This study demonstrates a highly stable MoSSe@rGO electrocatalyst with vertically aligned geometry and 1T/2H hybrid phase engineering for Li-S batteries. The catalyst provides strong chemical adsorption and enhanced bidirectional catalytic activity towards lithium polysulfides, resulting in ultra-small voltage hysteresis, ultrahigh rate capability, and long cycle life.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Textiles
Andrea L. Wilde, Menghe Miao
Summary: The conversion of PAN-based precursors into carbon fibers requires precise control of treatment conditions. The stabilization process is a crucial step, where chemical modifications occur and significantly impact the properties of the final product. This study quantified the color changes caused by various stabilization conditions and found that measurements in the CIELAB and RGB color spaces correlated well with commonly used indicators for oxidized PAN fibers. The RGB color component B showed good linear and quadratic relationships with OPF density and relative cyclization index, respectively, suggesting its potential as a convenient tool for monitoring PAN fiber stabilization.
JOURNAL OF THE TEXTILE INSTITUTE
(2023)
Article
Chemistry, Applied
Yu Wu, Sunmeng Huang, Xin Liu, Yu Jiang, Daohong Zhang
Summary: An efficient and environmentally friendly UV-curable strategy for the fabrication of strong, flexible, and transparent polyurethane-polyacrylate coatings is presented. The coatings exhibit outstanding mechanical properties and UV-protective performance, making them suitable for applications such as automotive glass films.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Multidisciplinary
Xu Han, Yu Wu, Haoran Han, Zejun Xu, Tingcheng Li, Yu Jiang, Sufang Chen, Daohong Zhang
Summary: A super-strong reusable thermoplastic hot melt adhesive (HEA) was synthesized by incorporating a hyperbranched epoxy resin (MHER) with traditional diglycidyl ether of bisphenol A (DGEBA) and a polyether amine bearing the ureidopyrimidinone motif. HEA-8 showed significantly improved adhesion strength, tensile strength, and tensile toughness compared to HEA-0, with approximately 10.7 MPa of adhesion strength and >82% adhesion strength retained after five cycles.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Yu Jiang, Ziyu Ran, Yangfei Wu, Meng Zhang, Ying Ma, Daohong Zhang
Summary: This article introduces a new family of reversible fluorescent adhesives based on Diels-Alder covalent adaptable networks with dynamic AIE crosslinks. The accurate intrinsic correlation between emission behavior, cross-linking state, and adhesion capability is established, enabling the in situ visualization of adhesion capacity.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Junheng Zhang, Zhangjie Gong, Cheng Wu, Tingcheng Li, Yuanyu Tang, Jingde Wu, Can Jiang, Menghe Miao, Daohong Zhang
Summary: In this study, a hyperbranched polymer based on itaconic acid was synthesized and incorporated into the preparation of epoxy vitrimers. The resulting epoxy vitrimers showed excellent mechanical properties and malleability, and could be efficiently degraded and recycled for environmental-friendly reprocessing.
