首页|Bio-based conductive polyurethane composites derived from renewable castor oil with enhanced self-healing ability for flexible supercapacitors
Bio-based conductive polyurethane composites derived from renewable castor oil with enhanced self-healing ability for flexible supercapacitors
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To alleviate the pressure on the petrochemical industry and address environmental concerns,the utiliza-tion of polyurethane(PU)derived from castor oil(CO)(as an ester polyol replacement of petrochemical-based materials)has garnered significant attention in recent decades.Extending the service life of ma-terials requires imparting self-healing properties to vegetable oil-based polymers,an aspect that has re-ceived limited attention in current studies.However,low self-healing efficiency still poses a significant challenge,and non-conductivity also remains an obstacle in current research,crucial for their application in electronic devices.In this work,we present the first series of electrically self-healing biopolymer com-posites constructed by incorporating carbon nanotube(CNT)networks into crosslinked castor oil-based polyurethane(BPU)through a simple curing process.These materials address the challenges mentioned above and exhibit improved mechanical,electrical,and self-healing capabilities compared to other bio-based self-healing materials.The resulting BPU/CNT composite demonstrated exceptional repeated self-healing capacity,restoring both mechanical properties and electrical performance even after experiencing severe mechanical damage.Notably,this composite served as a conductive substrate in flexible solid-state supercapacitor(FSSC)devices.Consequently,the FSSC derived from the composite conductive substrate achieved an impressive 92.4％self-healing efficiency even after undergoing 7 cutting/healing cycles.The device remained virtually unchanged even after being bent at a 180° angle with a bending radius of 1.6 mm,indicating excellent repeatability and durability.The exceptional self-healing ability,with～98％electrical recovery at 100 ℃ for 70 s and 93％at 80 ℃ after 6 min,of these composites was attributed to the synergistic interactions of the dynamic exchange reactions of disulfide bonds and dense hydrogen bonds within the BPU matrix,which provide a reversible dynamic polymer network.The healing effi-ciency of these dynamic bonds was evaluated by adjusting the composition ratio of the long linear chain of pTHF in hybrid polyols of the crosslinked polymer network.Overall,this work highlights a series of green,simple,and highly efficient self-healing polymer composites derived from renewable castor oil,and it establishes an essential framework for future sustainable polymer composite design.
Van-Phu Vu、Seung-Hyun Kim、Van-Dung Mai、Sooyeon Ra、Sangmin An、Soo-Hyoung Lee
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School of Semiconductor and Chemical Engineering,Jeonbuk National University,567 Baekje-daero,Deokjin-gu,Jeonju-si,Jeollabuk-do 54896,Republic of Korea
Department of Physics,Research Institute of Physics and Chemistry,Jeonbuk National University,Jeonju 54896,Republic of Korea
Department of JBNU-KIST Industry-Academia Convergence Research,Jeonbuk National University,567 Baekje-daero,Deokjin-gu,Jeonju-si,Jeollabuk-do 54896,Republic of Korea
Commercialization Promotion Agency for R&D Outcomes(COMPA)grant funded by the Korean Government(Ministery of Science and ICT
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