One-way and two-way shape memory effects of a high-strain <i>cis</i>-1,4-polybutadiene–polyethylene copolymer based dynamic network <i>via</i> self-complementary quadruple hydrogen bonding

Yang, Qi; Zheng, Wenjie; Zhao, Wenpeng; Peng, Chuang; Ren, Juntao; Yu, Qizhou; Hu, Yanming; Zhang, Xuequan

doi:10.1039/c8py01614c

Cited by 38 publications

(33 citation statements)

References 59 publications

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“…Therefore, an NIR laser source with a wavelength of 808 nm is employed for photostimulated actuation. According to differential scanning calorimetry (DSC) measurement ( Figure a), EHPB‐CTC possesses a broad melting transition ranging from 25 to 70 °C, due to the distribution of crystallite sizes . In situ small‐angle X‐ray scattering (SAXS) analysis indeed confirmed that this polymer is composed of PE crystallites with different lamellar thicknesses varying from ≈5.8 to 6.5 nm (Figure S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 89%

“…Recently, we have reported on the design and synthesis of a physically crosslinked network based on semicrystalline cis ‐1,4‐polybutadiene‐polyethylene (CPB‐PE) copolymer . This material exhibited reversible multiple SME and 2W‐SME by taking advantages of its broad melting transition and CIE and MIC effects arising from the crystalline PE segments.…”

Section: Introductionmentioning

confidence: 99%

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A Near‐Infrared Photoactuator Based on Shape Memory Semicrystalline Polymers toward Light‐Fueled Crane, Grasper, and Walker

Yang

Peng

Ren

et al. 2019

Advanced Optical Materials

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external energy input (e.g., electricity, heat, light, and humidity) into mechanical work to realize versatile and complex motions, allowing for a range of applications including soft robotics, artificial muscles, medical applications, and sensors. [2] In this context, photoactuators are particularly attractive because light can provide remote and noncontact energy supply and spatiotemporal control over the actuation. [3] Recently, a number of materials based on liquid-crystalline polymers, hydrogels, and photoswitchable moieties-bearing polymers that can undergo large deformation and reversible shape change arising from photochemical or photothermal effect have been designed and utilized to fabricate photoactuators. [4] Among them, the actuators using near-infrared (NIR) light as a actuation source seem more promising especially for biological applications owing to the deeper light penetration through tissues and less damage to biomaterials, as compared to UV and visible (Vis) light. [5] Thus far, studies of soft photoactuators have mainly focused on liquid crystal elastomers (LCEs) and networks (LCNs). [6] Two approaches are usually utilized to fabricate such actuators by either mixing photothermal conversion agents (e.g., carbon nanotube, graphene, metal nanomaterials, and organic compounds or materials) with LCEs or incorporation of organic dyes into polymer chains. [7] As such, the photothermal-induced LC-isotropic phase transition can be achieved and consequently impart the actuators with diverse intriguing motions such as bending, twisting, oscillations, and crawling. [7c,8] In order to realize complex shape deformation and multifunctionality of the actuators, controlling the spatial configuration of the LCNs in the directionality and hierarchical orientation is usually needed. [9] Some systems successfully achieve complex shape morphing by a single-layer LCN film with special LC orientation controlling, and in some cases, bi-and multi-layer systems comprised of a responsive LCN and a passive material layer are employed for this purpose. [8c,10] It is noted that constructing a single-layer, single-component actuator with complex shape deformations is highly desirable, thus increasing their versatility and the range of applications. [11] Semicrystalline polymers (SCPs) represent an important class of shape memory polymers (SMPs). Because of the ease Light-driven soft actuators with adaptive shape changes, diverse geometric morphing, and reversible macroscopic movements have gained everincreasing interest owing to their diverse applications ranging from biomedical to aerospace devices. Herein, presented is a near-infrared (NIR) light-stimulated actuator based on cis-1,4 polybutadiene-polyethylene semicrystalline copolymer. In the system, a newly synthesized croconaine dye, 2,5-bis[(6-(11-carboxyundecanoate)hexyl-4-carboxylate-piperidylamino) thiophenyl]-croconium, serves as both an NIR absorbing agent and crosslinker. Taking advantage of easy processability, two-way shape memory, and photothermal eff...

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

A Near‐Infrared Photoactuator Based on Shape Memory Semicrystalline Polymers toward Light‐Fueled Crane, Grasper, and Walker

Yang

Peng

Ren

et al. 2019

Advanced Optical Materials

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“…For one‐way shape memory effects (OWSME), subsequent heating through the transition temperature (such as T g or T m ) unlocks the temporary shape and the material recovers the permanent shape (usually a sheet or rod). These SMPs are also described as dual‐shape memory polymers (dual‐SMPs) because of their simple transitions between two shape states, with only one “memorized” temporary shape 372. Although OWSME can be observed in any polymer, some materials are either naturally, synthetically, or structurally advantageous to SME processing.…”

Section: Shape Memory Polymersmentioning

confidence: 99%

“…Multistate thermal programming of SMPs is particularly promising for robotic implementations because of their potential to perform complex functions or reversibly cycle their actuation and be able to self‐locomote. Over the past decade, the multishape memory effect (MSME) and the two‐way shape memory effect (TWSME) have been subjects of significant study to expand upon the capabilities afforded by the OWSME 372. Cross‐talk between mechanisms within a single material system is also becoming increasingly common for advanced materials of complex form and function 373–375.…”

Section: Shape Memory Polymersmentioning

confidence: 99%

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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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Two‐Way Semicrystalline Shape Memory Elastomers: Development and Current Research Trends

Basak

Bandyopadhyay

2022

Adv Eng Mater

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Two‐way shape memory polymers (SMPs) have gained significant attention in the recent past owing to their ability to spontaneously and reversibly switch between two different shapes when heated and cooled, thereby allowing them to reversibly actuate autonomously. Semicrystalline elastomers are one of the best classes to design two‐way SMPs owing to the crystallization‐induced elongation and the melting‐induced contraction that can result in reversible strain in the elastomeric network and can be applied to fabricate artificial muscles and actuators. This review revisits the overview of the SMPs and the inspiration behind developing two‐way shape memory semicrystalline elastomers and their mechanistic pathway. Finally, the latest developments in the realm of the elastomeric networks and how these smart materials are gaining spotlight along with the future purview and potential outlook are circumscribed.

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One-way and two-way shape memory effects of a high-strain cis-1,4-polybutadiene–polyethylene copolymer based dynamic network via self-complementary quadruple hydrogen bonding

Abstract: A polymer network based on a cis-1,4-polybutadiene–polyethylene copolymer exhibits multi- and two-way shape memory effects as well as a high-strain capacity.

Cited by 38 publications

References 59 publications

A Near‐Infrared Photoactuator Based on Shape Memory Semicrystalline Polymers toward Light‐Fueled Crane, Grasper, and Walker

A Near‐Infrared Photoactuator Based on Shape Memory Semicrystalline Polymers toward Light‐Fueled Crane, Grasper, and Walker

Materials as Machines

Two‐Way Semicrystalline Shape Memory Elastomers: Development and Current Research Trends

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