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
Polymer Science
Takuma Hanaoka, Yoshihiko Arao, Yoshihito Kayaki, Shigeki Kuwata, Masatoshi Kubouchi
Summary: Nitric acid decomposition is an effective method for recycling epoxy resin, with the chemical structure of the resin affecting the decomposition process; this study is the first systematic investigation into the relationship between chemical structure and decomposition.
POLYMER DEGRADATION AND STABILITY
(2021)
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
Chemistry, Applied
Akos Pomazi, Andrea Toldy
Summary: The research focuses on developing multifunctional, flame retarded epoxy gelcoat formulations using phosphorus-containing intumescent flame retardant. The study found that epoxy resin-based gelcoats with ammonium polyphosphate (APP) exhibited superior thermal stability, especially with increased APP concentration leading to enhanced thermal stability and limiting oxygen index.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Mechanics
Shijun Chen, Xuewen Cao, Lei Zu, Jingxuan He, Qian Zhang, Ping Ren, Guiming Zhang, Qiaoguo Wu, Jianhui Fu, Lichuan Zhou
Summary: This article conducted high-temperature pyrolysis recycling experiments on carbon fiber filaments to improve the mechanical properties of recycled carbon fibers. The influence of residual resin content and fiber oxidation on tensile properties was revealed, and process parameters were optimized for high temperature pyrolysis recycling of resin-matrix carbon fiber composites. The results showed that temperature had the greatest influence, a small amount of resin residue helped improve tensile strength, and pyrolysis time had a parabolic relationship with tensile strength.
COMPOSITE STRUCTURES
(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
Polymer Science
Hyunshick Youn, Younggi Hong, Ayeong Yu, Jisu Jeong, Munju Goh
Summary: A novel oxime epoxy based on 1,4-benzoquinone dioxime has been developed, which decomposes quickly under mild conditions and without organic solvents, showing good environmental friendliness.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Lorena Saitta, Giuliana Rizzo, Claudio Tosto, Gianluca Cicala, Ignazio Blanco, Eugenio Pergolizzi, Romeo Ciobanu, Giuseppe Recca
Summary: Currently, there are concerns about the non-recyclability of epoxy resins in the market, as well as their synthesis via petroleum-based raw materials which limit their usage. Therefore, finding environmentally friendly alternatives for epoxy formulation is crucial. This paper explores a Cradle-to-Cradle approach to ensure the infinite reuse of epoxy resins, starting with a fully recyclable bio-based epoxy formulation and obtaining a recycled polymer that can be mixed with the same formulation. The approach provides a sustainable disposal route for epoxy resin and offers a green component for the primary bio-based epoxy matrix.
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
Chemistry, Multidisciplinary
Xuelian Zhou, Shun Zhang, Wenli An, Xu Zhao, Yuwei Long, Xuehui Liu, Shimei Xu, Yu-Zhong Wang
Summary: This study demonstrates a feasible and promising method to achieve high-efficiency degradation and high-value utilization of amine-cured epoxy resin (EP) through H2O2/phosphotungstic acid catalytic oxidation system. The degradation products with high molecular weight and narrow molecular weight distribution were successfully used as dye adsorption blend films and supramolecular adhesives. This method provides a potential solution for the recycling of waste EP thermoset into high-performance materials.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Dong Quan, Ujala Farooq, Guoqun Zhao, Clemens Dransfeld, Rene Alderliesten
Summary: Exploring routes for the effective use of recycled carbon fibres (rCFs) is critical to improve the fracture toughness of carbon fibre/epoxy composites. This study demonstrated the potential of using rCFs with PPS fibres for interlayer toughening, resulting in significant enhancements in the interlaminar fracture properties. The main toughening mechanisms were found to be fiber bridging for rCF/PPS mats.
MATERIALS & DESIGN
(2022)
Review
Chemistry, Multidisciplinary
Tankut Turel, Ozgun Daglar, Fabian Eisenreich, Zeljko Tomovic
Summary: Epoxy thermosets are widely used in various industries due to their excellent thermal and mechanical properties. However, their covalently crosslinked structures pose challenges for chemical recycling. Developing smart monomers with functional groups to enable the synthesis of fully recyclable polymers is crucial. This review highlights recent advancements in chemically recyclable epoxy systems and evaluates their potential for supporting a circular plastic economy.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Construction & Building Technology
Yuxin Huang, Chuansheng Xiong, Heng Yang, Zuquan Jin, Penggang Wang, Xiangke Guo, Zhuren Wang, Yuan Hu, Xinyu Zhao
Summary: This study investigated the evolution of epoxy resin properties in a simulated concrete pore solution at different temperatures. The results showed that long-term hygrothermal immersion significantly deteriorated the resin properties, while short-term high-temperature soaking improved the properties.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Analytical
Fu-Rong Xiu, Qingyun Bai, Chuanzhong Chen, Yingying Qi, Siyi Wang, Xiaochun Tan
Summary: In this study, a novel resource conversion strategy using subcritical water-CuO process was developed to produce high-purity phenolic chemicals from waste printed circuit boards. The SubCW-CuO process showed high selectivity and efficiency in producing high-purity phenol and p-cresol products, while effectively fixing bromine.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Polymer Science
Tetsu Sato, Mariko Takahashi, Takeshi Saito, Masahito Toyonaga, Itsuo Tanuma, Rie Yamada, Satoru Hosoda
Summary: An automatic evaluation system for photooxidation has been developed and successfully applied to assess the photo-OIT of LDPE samples containing photooxidation stabilizers. The system allows independent setting of various measurement conditions and provides detailed information on the photooxidation process.
POLYMER DEGRADATION AND STABILITY
(2024)
Article
Polymer Science
Zongzheng Zuo, Shuxue Zhou
Summary: In this study, three fluoroalkyl trimethoxysilane (FATMS) additives with different chain lengths were incorporated into a two-component polyurethane clearcoat to improve its hydrophobic durability. The coatings modified with FATMS maintained their surface hydrophobicity under various conditions, but quickly lost it when exposed to both UV irradiation and/or high temperature with water. The results suggest that the FATMS route is more suitable for indoor applications at room temperature.
POLYMER DEGRADATION AND STABILITY
(2024)
Article
Polymer Science
Song Li, Feng Zhao, Xueya Wang, Zhihua Liu, Jingze Guo, Yutong Li, Shuangmei Tan, Zhenxiang Xin, Shuai Zhao, Lin Li
Summary: Green flame retardants have garnered attention for their environmental friendliness, but current options fall short in achieving high flame retardancy for flammable polymers and maintaining environmental protection. This study takes a two-pronged approach to address flame retardants and the flame-retardant process. An eco-friendly bio-based synergistic flame retardant (PAU), synthesized using phytic acid (PA) and urea (U), is used to create a flame retardant coating that can be directly applied to any surface shape using polydopamine as an adhesive. The resulting EPS-PAU exhibits excellent flame retardancy, smoke suppression, and light weight while only slightly increasing the density.
POLYMER DEGRADATION AND STABILITY
(2024)
