摘要：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 ***,FDM often requires sacrificial support structures,which significantly complicates the processing and increases the ***,poor layer-to-layer adhesion greatly affects the mechanical stability of 3D-printed ***,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 *** with various shapes were printed using a simple compact 3D printer,and readily assembled into large sophisticated architectures via *** dynamic bonds induce strong binding between ***,damaged printed objects can spontaneously heal,which significantly elongates their service *** work paves a simple and powerful way to solve the key bottlenecks in FDM 3D printing,and will have diverse applications.

摘要：Polyurethane elastomers with covalent adaptable networks(PU-CANs)based on the dynamic urethane bond have attracted remarkable attention owing to their reprocessability,adaptability,and ***,it is still a formidable challenge to achieve excellent dynamics at low temperatures since the urethane bond energy is usually ***,a fluorinated phenolic polyurethane(FPPU)elastomer with CANs based on phenol±carbamate bonds was successfully designed and ***,the effects of fluorine atoms on the mechanical properties,thermal stability,reprocessability,and self-healability,surface free energy,and hydrophobicity of the prepared elastomers were systematically *** FPPU elastomer showed notch-insensitivity,remarkable self-healable efficiency(98%),low dynamic dissociation temperature(60℃),excellent reprocessability,and low surface energy(62 MJ m^(-2))compared with non-fluorinated counterpart phenolic polyurethane elastomer(APPU).Based on the above-mentioned features,FPPU was selected as an elastic substrate to assemble into a triboelectric nanogenerator(TENG)to harvest energy from natural *** TENG exhibited an excellent electrical output performance with a peak open-circuit voltage of 103 V,a peak short-circuit current of 4.7μA and a peak short-circuit charge of 43 *** addition,the TENG possessed high selfcleaning and reprocessing ***,a stretchable and self-healing composite conductor based on FPPU was fabricated for flexible electronic devices.

摘要：无线传感器网络因具有低功耗、大规模、低成本等优点,使其在智能配电网中有着广阔的发展前景。无线传感器网络拓扑结构和通信协议种类繁多,但依然存在功耗大、寿命短、信号质量差、传输距离近等问题。针对此问题,首先,设计了配电站房、柱上变压器、箱式变压器三种典型应用场景中无线传感器网络的整体结构,针对智能配电网无线传感器网络寿命短的问题,考虑传感器重要等级和设备健康状态提出了簇头节点的选取与更新策略;其次,针对智能配电网无线传感器网络通信信号质量差的问题,提出了基于433 MHz的智能配电网星型无线传感器网络拓扑结构;最后,完成了智能配电网典型应用场景中无线传感器网络的组网设计。