Preparation and assembly of five photoresponsive polymers to achieve complex light-induced shape deformations

Fang, Tianyu; Cao, Lili; Chen, Shun-Ping; Fang, Jiaojiao; Zhou, J.; Fang, Liang; Lu, Chunhua; Xu, Zhongzi

doi:10.1016/j.matdes.2018.02.029

Cited by 33 publications

(30 citation statements)

References 52 publications

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“…PU networks have been prepared with pendant azo groups to access this type of shape memory functionality 412. When combined with nanoparticle fillers that are responsive to various wavelengths of light, azo‐PUs assembled into bilayers have demonstrated selective curling based on the exposure wavelength 413. In addition to azobenzene, light‐activated shape memory in which crosslinking is reversibly modified via photocrosslinking and photocleaving, generates a transition state and allows shape programming 408.…”

Section: Shape Memory Polymersmentioning

confidence: 99%

Materials as Machines

2020

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of responsive materials as machines is in robotics. The vision, leadership, and research of Bar-Cohen is seminal in both invigorating and focusing current-day research activities to develop responsive materials [2] and implement [3] them as lightweight, dexterous, and gentle (e.g., soft) robotic elements. In this spirit, this review exhaustively details the materials, the nature of their stimuli-response, and discusses considerations for their implementation in robotic systems and subsystems.Robotics is a well-established but growing field of research. Sustained progress in both performance and functionality continue to be realized in commercial robotic systems largely based on conventional materials and their integration with mechanisms. A recent example is the Atlas robot from Boston Dynamics [4] (Figure 1a). The incorporation of stimuli-responsive materials in robotics has largely focused on component-level demonstrations to extend the performance of a subsystem (such as a hand or gripper).Stimuli-responsive materials, spanning nearly all classes of materials and size scales, are currently subject to widespread examination in corporate, government, and academic research laboratories (Figure 1b-d). [5][6][7] In some cases, these materials have already found widespread commercial implementation in end use and are comparatively mature. The materials and fundamentals of their responses are summarized in Figure 2. Shape memory alloys (SMAs) and ceramic piezoelectric materials are distinctive in that they are hard, stimuli-responsive materials. Deformation of these materials can produce large energy densities due to their inherent stiffness. Electroactive polymers (EAPs) remain a topic of considerable interest, particularly dielectric elastomer actuators (DEAs). Engineered systems are rapidly emerging and enabling performance gains in robotics, largely based on pneumatic or fluidic (such as HASEL [8] actuators) transport processes that localize deformation to generate force or produce motion. Soft materials, such as shape memory polymers (SMPs), hydrogels, and liquid crystalline polymer networks (LCNs) and elastomers (LCEs) may offer distinctive functional performance to robotic systems in allowing local control of deformation without the need for complex interfacing with mechanisms. As will be evident, each of these materials has inherent advantages and performance tradeoffs that must be considered in functional implementations. However, responsive material systems have a common obstacle to widespread use: the performance and Machines are systems that harness input power to extend or advance function. Fundamentally, machines are based on the integration of materials with mechanisms to accomplish tasks-such as generating motion or lifting an object. An emerging research paradigm is the design, synthesis, and integration of responsive materials within or as machines. Herein, a particular focus is the integration of responsive materials to enable robotic (machine) functions such as gripping, lifting, or motility (walk...

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Section: Shape Memory Polymersmentioning

confidence: 99%

Materials as Machines

2020

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“…Another straightforward approach for multilight responsiveness is combining different light‐sensitive components (either in the plane or across the thickness) into a multidomain or multilayer system ( Figure a) . The simple and independent addressing of selected parts of the material by modulating the wavelength of light allows well‐controlled and multiple shape morphing.…”

Section: Multiwavelength Photocontrolled Actuatorsmentioning

confidence: 99%

Shining Light on Liquid Crystal Polymer Networks: Preparing, Reconfiguring, and Driving Soft Actuators

Jiang

Xiao

Zhao

2019

Advanced Optical Materials

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Soft actuators based on liquid crystal polymer networks (LCNs) have emerged as an exciting research topic due to many envisioned applications in areas such as soft robotics and self‐regulating devices. The infatuation stems from the amazing ability of LCNs to display reversible, large amplitude, and complex shape change as well as locomotion upon a stimuli‐triggered phase transition of mesogens between ordered liquid crystal and disordered isotropic state. Among the various stimuli, light arguably is the most attractive choice. Light can easily be adjusted for its wavelength, intensity, or polarization, structured by means of photomasks or interference patterns, and applied to a target remotely and with high spatiotemporal resolution. Indeed, much research effort is dedicated to LCN actuators that are designed to respond to light in many ways, with light being used not only as an external energy source to drive the shape changes or motion of LCN actuators, but also as a versatile tool in their fabrication and reconfiguration. In this Review, recent achievements are highlighted, a number of important issues are discussed, and critical analysis on the use of light in making, reconfiguring, and driving LCN actuators is provided.

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“…Most photoresponsive actuators could respond to only one source of light due to the limit of photothermal transition of traditional fillers. The multi‐photoresponsive performance that the photoresponsive behavior can be facilely tuned by changing the light wavelength is highly in demand to broaden the field of applications . Xu et al prepared five photoresponsive polymers toward UV, visible, and NIR light, by blending azobenzene‐modified shape memory polymers with four different photothermal fillers .…”

Section: Introductionmentioning

confidence: 99%

“…The multi‐photoresponsive performance that the photoresponsive behavior can be facilely tuned by changing the light wavelength is highly in demand to broaden the field of applications . Xu et al prepared five photoresponsive polymers toward UV, visible, and NIR light, by blending azobenzene‐modified shape memory polymers with four different photothermal fillers . Still, to make actuators responsive to multilight stimuli, multiple photothermal fillers and/or photoresponsive groups are assembled together, which make the whole preparation process very sophisticated.…”

Section: Introductionmentioning

confidence: 99%

Rapid Near‐Infrared Light Responsive Shape Memory Polymer Hybrids and Novel Chiral Actuators Based on Photothermal W₁₈O₄₉ Nanowires

Zhou

Tan

Chong

et al. 2019

Adv Funct Materials

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Photoresponsive actuators are built by introducing oligo(ethylene glycol) (OEG)modified W 18 O 49 nanowires into cross-linked polyethylene glycol diacrylate (cPEGDA) polymer matrices. Due to the good compatibility, OEG-W 18 O 49 NWs disperse well and increase the crystallinity of cPEGDA matrices even in high loading concentrations (4.0 wt%). The cPEGDA/W 18 O 49 nanocomposites show efficient photothermal transition and rapid shape memory behaviors. They can raise the local temperature to 160 °C in only 8.5 s and recover the initial shape within 10 s. Making use of the broad and strong absorption property of W 18 O 49 , the cPEGDA/W 18 O 49 NW actuators respond to both ultraviolet and near-infrared light and make contraction and bending motions. Furthermore, by utilizing oriented chain segments of the crystalline polymer and vector sum of shape recovery forces, the cPEGDA/W 18 O 49 NW hybrid actuators exhibit stable helical deformation (right-handed and left-handed).

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Preparation and assembly of five photoresponsive polymers to achieve complex light-induced shape deformations

Cited by 33 publications

References 52 publications

Materials as Machines

Materials as Machines

Shining Light on Liquid Crystal Polymer Networks: Preparing, Reconfiguring, and Driving Soft Actuators

Rapid Near‐Infrared Light Responsive Shape Memory Polymer Hybrids and Novel Chiral Actuators Based on Photothermal W₁₈O₄₉ Nanowires

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Preparation and assembly of five photoresponsive polymers to achieve complex light-induced shape deformations

Cited by 33 publications

References 52 publications

Materials as Machines

Materials as Machines

Shining Light on Liquid Crystal Polymer Networks: Preparing, Reconfiguring, and Driving Soft Actuators

Rapid Near‐Infrared Light Responsive Shape Memory Polymer Hybrids and Novel Chiral Actuators Based on Photothermal W18O49 Nanowires

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Product

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Rapid Near‐Infrared Light Responsive Shape Memory Polymer Hybrids and Novel Chiral Actuators Based on Photothermal W₁₈O₄₉ Nanowires