Polyolefins are widely used across industries due to their low cost and excellent stability.However,their inert C–C and C–H bonds pose a significant challenge for functional modification.Meanwhile,the environmental ...Polyolefins are widely used across industries due to their low cost and excellent stability.However,their inert C–C and C–H bonds pose a significant challenge for functional modification.Meanwhile,the environmental impact of polyolefin waste represents a significant and intensifying issue,rendering its disposal a major challenge.Herein,we developed renewable,recyclable,and durable resins while sustaining the capability to modularly construct various functionalities,called the“LEGO strategy,”via upcycling polyethylene(PE)into multifunctional materials through a two-step process:controlled degradation into macromolecular PE blocks containing active groups,followed by reconstruction with functional blocks via dynamic imine bonds.This approach enabled the incorporation of diverse functionalities,such as flame retardancy,ultraviolet shielding,antistatic performance,and cationic dyeability in an on-demand manner,while enhancing mechanical performance.Moreover,the dynamic nature of the imine bonds and the hydrophobic property of PE chains imparts both excellent water stability and recyclability.This approach offers a new pathway for upcycling polyolefins into diverse functional materials,addressing both environmental concerns and application demands.展开更多
基金supported financially by the National Natural Science Foundation of China(grant no.22293063)the Fundamental Research Funds for the Central Universities,China,and the Institutional Research Fund from Sichuan University,China(grant no.2020SCUNL205)the innovation-based 111 project initiated by the Ministry of Education of China(grant no.B20001).
文摘Polyolefins are widely used across industries due to their low cost and excellent stability.However,their inert C–C and C–H bonds pose a significant challenge for functional modification.Meanwhile,the environmental impact of polyolefin waste represents a significant and intensifying issue,rendering its disposal a major challenge.Herein,we developed renewable,recyclable,and durable resins while sustaining the capability to modularly construct various functionalities,called the“LEGO strategy,”via upcycling polyethylene(PE)into multifunctional materials through a two-step process:controlled degradation into macromolecular PE blocks containing active groups,followed by reconstruction with functional blocks via dynamic imine bonds.This approach enabled the incorporation of diverse functionalities,such as flame retardancy,ultraviolet shielding,antistatic performance,and cationic dyeability in an on-demand manner,while enhancing mechanical performance.Moreover,the dynamic nature of the imine bonds and the hydrophobic property of PE chains imparts both excellent water stability and recyclability.This approach offers a new pathway for upcycling polyolefins into diverse functional materials,addressing both environmental concerns and application demands.
