Three-dimensional(3 D)printing has had a large impact on various fields,with fused deposition modeling(FDM)being the most versatile and cost-effective 3 D printing technology.However,FDM often requires sacrificial sup...Three-dimensional(3 D)printing has had a large impact on various fields,with fused deposition modeling(FDM)being the most versatile and cost-effective 3 D printing technology.However,FDM often requires sacrificial support structures,which significantly complicates the processing and increases the cost.Furthermore,poor layer-to-layer adhesion greatly affects the mechanical stability of 3D-printed objects.Here,we present a new Print-Healing strategy to address the aforementioned challenges.A polymer ink(Cu-DOU-CPU)with synergetic triple dynamic bonds was developed to have excellent printability and room-temperature self-healing ability.Objects with various shapes were printed using a simple compact 3D printer,and readily assembled into large sophisticated architectures via self-healing.Triple dynamic bonds induce strong binding between layers.Additionally,damaged printed objects can spontaneously heal,which significantly elongates their service life.This work paves a simple and powerful way to solve the key bottlenecks in FDM 3D printing,and will have diverse applications.展开更多
Polymeric materials have penetrated all aspects of society and play an irreplaceable role.However,there is an inherent contradiction between their mechanical properties and processing behavior.Here,inspired by cement,...Polymeric materials have penetrated all aspects of society and play an irreplaceable role.However,there is an inherent contradiction between their mechanical properties and processing behavior.Here,inspired by cement,a crucial construction material renowned for its excellent fabricating behavior and self-strengthening properties,we have developed dynamic crosslinked poly(oxime-urethane)(CPOU).The synthesized CPOU showed good self-healing ability and 3D printability owing to the dynamic dissociation and re-association of oxime-carbamate bonds.Simple objects printed through the fused deposition modeling technique were able to be readily assembled into complex architectures through intrinsic self-healing.Furthermore,the self-strengthening of CPOU was successfully realized through multiple-step tandem reactions.The dissociation of dynamic oxime-carbamate bonds produced–NCO groups,which reacted with the surrounding water to form polar urea bonds in the polymer network,leading to an increase in the tensile strength of CPOU from 11.95 to 19.37 MPa.This work not only develops the polymers with combined self-healing,facile fabricating,and self-strengthening properties but also provides a new molecular strategy to modulate the properties of polymers,which could be potentially applied in diverse areas.展开更多
基金supported by the National Natural Science Foundation of China(21991123,52073049 and 51703148)the Natural Science Foundation of Shanghai(20ZR1402500 and18ZR1401900)+4 种基金the Belt&Road Young Scientist Exchanges Project of Science and Technology Commission Foundation of Shanghai(20520741000)Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University(DHU),18520750400)the Fundamental Research Funds for the Central UniversitiesDHU Distinguished Young Professor Program(LZA2019001)the Open Research Fund of Shanghai Center for High-performance Fibers and Composites and the Center for Civil Aviation Composites of Donghua University。
文摘Three-dimensional(3 D)printing has had a large impact on various fields,with fused deposition modeling(FDM)being the most versatile and cost-effective 3 D printing technology.However,FDM often requires sacrificial support structures,which significantly complicates the processing and increases the cost.Furthermore,poor layer-to-layer adhesion greatly affects the mechanical stability of 3D-printed objects.Here,we present a new Print-Healing strategy to address the aforementioned challenges.A polymer ink(Cu-DOU-CPU)with synergetic triple dynamic bonds was developed to have excellent printability and room-temperature self-healing ability.Objects with various shapes were printed using a simple compact 3D printer,and readily assembled into large sophisticated architectures via self-healing.Triple dynamic bonds induce strong binding between layers.Additionally,damaged printed objects can spontaneously heal,which significantly elongates their service life.This work paves a simple and powerful way to solve the key bottlenecks in FDM 3D printing,and will have diverse applications.
基金financially supported by the National Natural Science Foundation of China(52173117,52303178,and 21991123)the National Key Research and Development Program of China(2021YFC2101800,2021YFC2400802)+4 种基金the Ningbo 2025 Science and Technology Major Project(2019B10068)the Shenzhen Science and Technology Innovation Commission(JCYJ20220818102804009)the Science and Technology Commission of Shanghai Municipality(20DZ2270800,20DZ2254900)the China Postdoctoral Science Foundation(2023M740585)the Shanghai Sailing Program(23YF1400500)。
文摘Polymeric materials have penetrated all aspects of society and play an irreplaceable role.However,there is an inherent contradiction between their mechanical properties and processing behavior.Here,inspired by cement,a crucial construction material renowned for its excellent fabricating behavior and self-strengthening properties,we have developed dynamic crosslinked poly(oxime-urethane)(CPOU).The synthesized CPOU showed good self-healing ability and 3D printability owing to the dynamic dissociation and re-association of oxime-carbamate bonds.Simple objects printed through the fused deposition modeling technique were able to be readily assembled into complex architectures through intrinsic self-healing.Furthermore,the self-strengthening of CPOU was successfully realized through multiple-step tandem reactions.The dissociation of dynamic oxime-carbamate bonds produced–NCO groups,which reacted with the surrounding water to form polar urea bonds in the polymer network,leading to an increase in the tensile strength of CPOU from 11.95 to 19.37 MPa.This work not only develops the polymers with combined self-healing,facile fabricating,and self-strengthening properties but also provides a new molecular strategy to modulate the properties of polymers,which could be potentially applied in diverse areas.
