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Chemomechanical Properties of Electrospun Polyvinyl Acetate(PVAc)Fiber Mat and its Application in Water-Triggered self-folding

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Acta Mechanica Solida Sinica 2022年第5期35卷 851-866页

作者： Diankun Zhou Kun Jiang Yiqi Mao Shujuan Hou State Key Laboratory of Advanced Design and Manufacruing for Vehicle Body Hunan UniversityChangsha410082China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China

Environmental-stimulus-triggered self-folding mechanisms have found promising applications in many engineering ***,a water-activated self-folding procedure has been designed by using the electrospun polyvinyl acetate(PVAc)fiber mat which contains high tensile residual stresses in the vitrified fibers during the spinning *** water permeation initiates plasticization of PVAc fiber mat and leads to a material *** water diffusion starts at the top surface of a PVAc sheet,a shrinkage variation along the diffusion pathway forms a bending hinge on the sheet,which has been demonstrated in 3D origami *** capture the water-triggered plasticization mechanism and chemomechanical coupling deformation compatibility,a consistent finite deformation viscoplastic model is developed for the PVAc fiber mat under coupled chemomechanical loading *** residual stress and‘fixed’strain are modeled through the unrecoverable plastic strain in the PVAc fiber *** water permeates into the PVAc fiber mat,the induced increase in mixing entropy lowers the glass transition temperature of the material,and results in a gradual relaxation of the fixed viscoplastic strain.A non-Fickian diffusion model suitable for glassy material is adopted to capture the water permeation in the PVAc fiber *** calibrated and validated by a series of experiments,the proposed model is implemented in ABAQUS software to simulate the water-activated self-folding of PVAc *** numerical example for a typical origami design suggests a promising engineering application prospect.

关键词： Polyvinyl acetate(PVAc)fiber mat Water diffusion Viscoplastic model self-folding

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Solvent-Triggered self-folding of Hydrogel Sheets

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Chinese Journal of Chemical Physics 2018年第5期31卷 667-672,735页

作者： Shuai Qin Li-wei Hui Li-hua Yang Ming-ming Ma CAS Key Laboratory of Soft Matter Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China

Intense investigations have been attracted to the development of materials which can recon-figure into 3D structures in response to external *** we report on the design and self-folding behaviors of hydrogels composed of poly(ethylene glycol)methyl ether methacry-late(OEGMA)and 2-(2-methoxyethoxy)ethyl methacrylate(MEO2MA).Upon immersion into a variety of solvents at room temperature,the resulting P(MEO2MA-co-OEGMA)hy-drogel sheets self-fold into 3D morphologies,and the observed transformation in shape is *** further show that composition of the gel,gaseous environment,and prepara-tion procedure play important roles in the self-folding behavior of the resulting *** work provides a facile approach for fabricating self-folding hydrogels.

关键词： self-folding Solvent responsive Shape transformation Hydrogel

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Ion-Controlled Switchable Complexation of Triptycene-Derived Macrotricyclic Host and self-folding A-D-A Guest

Ion-Controlled Switchable Complexation of Triptycene-Derived...

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全国第十六届大环化学暨第八届超分子化学学术讨论会

作者： Ying Han Chuan-Feng Chen Institute of Chemistry Chinese Academy of Sciences

＜正＞In host-guest chemistry,a permanent and challenging topic is to develop novel macrocyclic hosts with the capability of binding specific substrate species strongly and ***,we have proved that the tripytcene derivatives could be utilized as useful building blocks for the design and synthesis of novel hosts with specific structures and *** the other hand,the foldamers have attracted much attention,and to our knowledge,no foldamers used as guests in a host-guest system have been hitherto

关键词： Switchable Triptycene Macrocyclic host self-folding

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Peeling of Magneto-responsive Beams with Large Deformation Mediated by the Parallel Magnetic Field

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Acta Mechanica Solida Sinica 2024年第3期37卷 457-467页

作者： Gongqi Cao Zhangna Xue Shiyang Liu Yuchen Jin Jianlin Liu College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao266580China

Elasto-capillarity phenomena are prevalent in various industrial fields such as mechanical engineering,material science,aerospace,soft robotics,and *** this study,two typical peeling processes of slender beams driven by the parallel magnetic field are investigated based on experimental and theoretical *** first is the adhesion of two parallel beams,and the second is the self-folding of a long *** these two cases,the energy variation method on the elastica is used,and then,the governing equations and transversality boundary conditions are *** is shown that the analytical solutions are in excellent agreement with the experimental *** effects of magnetic induction intensity,distance,and surface tension on the deflection curve and peeling length of the elastica are fully *** results are instrumental in accurately regulating elasto-capillarity in structures and provide insights for the engineering design of programmable microstructures on surfaces,microsensors,and bionic robots.

关键词： Magneto-responsive beam Adhesion and peeling self-folding Elastica Transversality condition

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Design and Research of Form Controlled Planar folding Mechanism based on 4D Printing Technology

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 281-293页

作者： Wencai Zhang Zhenghao Ge Duanling Li College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyShaanxi 710021China School of Automation Beijing University of Posts and TelecommunicationsBeijing 100876China

The use of non-smart materials in structural components and kinematic pairs allows for flexible assembly in practical applications and is promising for aerospace ***,this approach can result in a complex structure and excessive kinematic pairs,which limits its potential applications due to the difficulty in controlling and actuating the *** smart materials have been integrated into certain mechanisms,such integration is generally considered a unique design for specific cases and lacks ***,organically combining universal mechanism design with smart materials and 4D printing technology,innovating mechanism types,and systematically exploring the interplay between structural design and morphing control remains an open research *** this work,a novel form-controlled planar folding mechanism is proposed,which seamlessly integrates the control and actuation system with the structural components and kinematic pairs based on the combination of universal mechanism design with smart materials and 4D printing technology,while achieving self-controlled dimensional ratio adjustment under a predetermined thermal *** design characteristics of the mechanism are analyzed,and the required structural design parameters for the preprogrammed design are derived using a kinematic *** smart materials and 4D printing technology,folding programs based on material properties and control programs based on manufacturing parameters are encoded into the form-controlled rod to achieve the preprogrammed design of the ***,two sets of prototype mechanisms are printed to validate the feasibility of the design,the effectiveness of the morphing control programs,and the accuracy of the theoretical *** mechanism not only promotes innovation in mechanism design methods but also shows exceptional promise in satellite calibration devices and spacecraft walking systems.

关键词： Form-controlled mechanism self-folding Smart materials 4D printing Morphing control

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