Abstract
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.
基金项目
Commercialization Promotion Agency for R&D Outcomes(COMPA)grant funded by the Korean Government(Ministery of Science and ICT(RS-2023-00304743)
NETL
NSTL
万方数据