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31. Dynamic Covalent Bonds Enabled Carbon Fiber Reinforced Polymers Recyclability and Material Circularity.

Author

Fan, Xiaotong, Zheng, Jie, Yeo, Jayven Chee Chuan, Wang, Sheng, Li, Ke, Muiruri, Joseph Kinyanjui, Hadjichristidis, Nikos, and Li, Zibiao

Subjects
CARBON fibers, COVALENT bonds, BORONIC esters, MATERIALS science, WASTE recycling
Abstract

Due to their remarkable features of lightweight, high strength, stiffness, high‐temperature resistance, and corrosion resistance, carbon fiber reinforced polymers (CFRPs) are extensively used in sports equipment, vehicles, aircraft, windmill blades, and other sectors. The urging need to develop a resource‐saving and environmentally responsible society requires the recycling of CFRPs. Traditional CFRPs, on the other hand, are difficult to recycle due to the permanent covalent crosslinking of polymer matrices. The combination of covalent adaptable networks (CANs) with carbon fibers (CFs) marks a new development path for closed‐loop recyclable CFRPs and polymer resins. In this review, we summarize the most recent developments of closed‐loop recyclable CFRPs from the unique paradigm of dynamic crosslinking polymers, CANs. These sophisticated materials with diverse functions, oriented towards CFs recycling and resin sustainability, are further categorized into several active domains of dynamic covalent bonds, including ester bonds, imine bonds, disulfide bonds, boronic ester bonds, and acetal linkages, etc. Finally, the possible strategies for the future design of recyclable CFPRs by combining dynamic covalent chemistry innovation with materials interface science are proposed. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Contact-electro-catalytic CO2 reduction from ambient air.

Author

Wang, Nannan, Jiang, Wenbin, Yang, Jing, Feng, Haisong, Zheng, Youbin, Wang, Sheng, Li, Bofan, Heng, Jerry Zhi Xiong, Ong, Wai Chung, TAN, Hui Ru, Zhang, Yong-Wei, Wang, Daoai, Ye, Enyi, and Li, Zibiao

Subjects
POLYVINYLIDENE fluoride, COPPER, CHARGE exchange, ENERGY consumption, ELECTROLYTIC reduction, CATALYSTS
Abstract

Traditional catalytic techniques often encounter obstacles in the search for sustainable solutions for converting CO2 into value-added products because of their high energy consumption and expensive catalysts. Here, we introduce a contact-electro-catalysis approach for CO2 reduction reaction, achieving a CO Faradaic efficiency of 96.24%. The contact-electro-catalysis is driven by a triboelectric nanogenerator consisting of electrospun polyvinylidene fluoride loaded with single Cu atoms-anchored polymeric carbon nitride (Cu-PCN) catalysts and quaternized cellulose nanofibers (CNF). Mechanistic investigation reveals that the single Cu atoms on Cu-PCN can effectively enrich electrons during contact electrification, facilitating electron transfer upon their contact with CO2 adsorbed on quaternized CNF. Furthermore, the strong adsorption of CO2 on quaternized CNF allows efficient CO2 capture at low concentrations, thus enabling the CO2 reduction reaction in the ambient air. Compared to the state-of-the-art air-based CO2 reduction technologies, contact-electro-catalysis achieves a superior CO yield of 33 μmol g−1 h−1. This technique provides a solution for reducing airborne CO2 emissions while advancing chemical sustainability strategy. Traditional catalytic techniques often encounter obstacles in the search for sustainable solutions for converting CO2 into value-added products because of their high energy consumption and expensive catalysts. Here, we introduce a contact-electro-catalysis approach for CO2 reduction reaction, achieving CO Faradaic efficiency of 96.24%. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Ultrafast Self‐Healing Elastomer with Closed‐Loop Recyclability.

Author

Mah, Justin Jian Qiang, Li, Ke, Feng, Hongzhi, Surat'man, Nayli Erdeanna Binte, Li, Bofan, Yu, Xiaohui, Zhang, Mingsheng, Wang, Sheng, and Li, Zibiao

Subjects
WASTE recycling, CHEMICAL recycling, BORONIC esters, SELF-healing materials, DIPOLE-dipole interactions, POLYMERS, ELASTOMERS
Abstract

The loss of function after prolonged periods of use is inevitable for all materials including plastics. Hence, self‐healing capabilities are a key development to prolong the service lifetime of materials. One of such self‐healing capabilities can be achieved by integrating dynamic bonds such as boronic ester linkages into polymeric materials, however the rate of self‐healing in these materials is insufficient and current methods to accelerate it are limited. In this study, we report the rational design, synthesis and characterization of a fluorinated elastomer (FBE15) that utilizes enhanced interaction between polymer chains afforded by strong dipole‐dipole interactions from −CF3, which showed a significant increase in binding energy to −7.71 Kcal/mol from −5.51 Kcal/mol, resulting in increased interaction between the boronic ester linkages and improving self‐healing capabilities of boronic ester materials, drastically reducing the time required for stress relaxation by 900 %. The bulk elastomer is capable of ultrafast self‐healing in a one‐click fashion that can happen in mere seconds, which can then be stretched to 150 % of its original length. By utilising the dynamic cross‐linking, FBE15 is also capable of both mechanical reprocessing into the same materials and chemical recycling into its starting materials, respectively, further allowing reconstruction of the elastomers that have comparable properties to the original ones at the end of its service lifespan. [ABSTRACT FROM AUTHOR]

Published
2024
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