There is usually a trade-off between high mechanical strength and dynamic self-healing because the mechanisms of these properties are mutually exclusive.Herein,we design and fabricate a fluorinated phenolic polyuretha...There is usually a trade-off between high mechanical strength and dynamic self-healing because the mechanisms of these properties are mutually exclusive.Herein,we design and fabricate a fluorinated phenolic polyurethane(FPPU)elastomer based on octafluoro-4,4'-biphenol to overcome this challenge.This fluorine-based motif not only tunes interchain interactions throughπ-πstacking between aromatic rings and free-volume among polymer chains but also improves the reversibility of phenol-carbamate bonds via electron-withdrawing effect of fluorine atoms.The developed FPPU elastomer shows the highest recorded puncture energy(648.0 m J),high tensile strength(27.0 MPa),as well as excellent selfhealing efficiency(92.3%),along with low surface energy(50.9 MJ m^(-2)),notch-insensitivity,and reprocessability compared with non-fluorinated counterpart biphenolic polyurethane(BPPU)elastomer.Taking advantage of the above-mentioned merits of FPPU elastomer,we prepare an anti-fouling triboelectric nanogenerator(TENG)with a self-healable,and reprocessable elastic substrate.Benefiting from stronger electron affinity of fluorine atoms than hydrogen atoms,this electronic device exhibits ultrahigh peak open-circuit voltage of 302.3 V compared to the TENG fabricated from BPPU elastomer.Furthermore,a healable and stretchable conductive composite is prepared.This research provides a distinct and general pathway toward constructing high-performance elastomers and will enable a series of new applications.展开更多
基金supported by the National Natural Science Foundation of China(52173117,52073049,and 21991123)the National Key Research and Development Program of China(2021YFC2101800 and 2021YFC2400802)+3 种基金Ningbo 2025 Science and Technology Major Project(2019B10068)the Natural Science Foundation of Shanghai(22ZR1400700)Shanghai Rising-Star Program(21QA1400200)the Science and Technology Commission of Shanghai Municipality(20DZ2254900 and 20DZ2270800)。
文摘There is usually a trade-off between high mechanical strength and dynamic self-healing because the mechanisms of these properties are mutually exclusive.Herein,we design and fabricate a fluorinated phenolic polyurethane(FPPU)elastomer based on octafluoro-4,4'-biphenol to overcome this challenge.This fluorine-based motif not only tunes interchain interactions throughπ-πstacking between aromatic rings and free-volume among polymer chains but also improves the reversibility of phenol-carbamate bonds via electron-withdrawing effect of fluorine atoms.The developed FPPU elastomer shows the highest recorded puncture energy(648.0 m J),high tensile strength(27.0 MPa),as well as excellent selfhealing efficiency(92.3%),along with low surface energy(50.9 MJ m^(-2)),notch-insensitivity,and reprocessability compared with non-fluorinated counterpart biphenolic polyurethane(BPPU)elastomer.Taking advantage of the above-mentioned merits of FPPU elastomer,we prepare an anti-fouling triboelectric nanogenerator(TENG)with a self-healable,and reprocessable elastic substrate.Benefiting from stronger electron affinity of fluorine atoms than hydrogen atoms,this electronic device exhibits ultrahigh peak open-circuit voltage of 302.3 V compared to the TENG fabricated from BPPU elastomer.Furthermore,a healable and stretchable conductive composite is prepared.This research provides a distinct and general pathway toward constructing high-performance elastomers and will enable a series of new applications.
基金supported by the Open Research Fund of Center for Civil Aviation Composites of Donghua University and Shanghai Collaborative Innovation Center of High Performance Fibers and Composites (Province-Ministry Joint)the National Key Research and Development Program of China (2021YFC2101800)+8 种基金the National Natural Science Foundation of China (52173117, 52073049, 21991123, and 52075093)China Postdoctoral Science Foundation (2021M702898)the Natural Science Foundation of Shanghai (22ZR1400700 and 20ZR1402500)Shanghai Rising-Star Program (21QA1400200)the Belt & Road Young Scientist Exchanges Project of Science and Technology Commission Foundation of Shanghai (20520741000)the Science and Technology Commission of Shanghai Municipality (20DZ2254900)the Fundamental Research Funds for the Central Universities (2232021G-02)DHU Distinguished Young Professor Program (LZA2019001)the Open Project of Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices (KJS1902).
