Shape memory ionomers

Cavicchi, Kevin A.; Pantoja, Marcos; Cakmak, Mukerrem

doi:10.1002/polb.24052

Cited by 34 publications

(21 citation statements)

References 54 publications

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“…Building on ionic motifs, ionic polymeric materials have the ability to endow the materials with thermally induced shape-memory characteristics. 132 Indeed, the reversible behavior of ionic interactions permits the breaking of the physical network upon heating (i.e. during programming and recovery steps) and its re-formation at lower temperature (i.e.…”

Section: Shape-memorymentioning

confidence: 99%

A comprehensive review of the structures and properties of ionic polymeric materials

et al. 2020

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Section: Shape-memorymentioning

confidence: 99%

A comprehensive review of the structures and properties of ionic polymeric materials

et al. 2020

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Section: Figurementioning

confidence: 99%

“…[16,20] Shape memory is the ability of a material to be programmed into a new temporary shape and then recover to its initial shape upon being triggered by external stimuli. [32,33] Shape memory has been achieved before in polymers by incorporating liquid-crystal elastomers, [14,34] semi-crystalline elastomers, [35,36] percolating networks of cellular nanofibers, [37] stearic acid, [38] wax, [39][40][41] and supercooled salt solution. [42] Smart materials with tunable stiffness have been used as actuation mechanisms for soft grippers based on mechanical interlocking or dynamically tunable dry adhesion, [43,44] for soft crawling robots, [45,46] for minimal invasive continuum devices, [47] and for reconfigurable surfaces in drones.…”

mentioning

confidence: 99%

Robust Three‐Component Elastomer–Particle–Fiber Composites with Tunable Properties for Soft Robotics

Nasab

Sharifi

Chen

et al. 2020

Advanced Intelligent Systems

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The ability to tune the mechanical stiffness between a soft state and a rigid state is essential for various living systems to navigate nature. Examples for this range from muscle-powered motor tasks and sexual reproduction, to spontaneous change in shape for predator evasion. [1] Similar to their natural counterparts, engineered materials with tunable properties including mechanical stiffness have the potential to be used in a broad range of engineering applications. [1,2] Structures made with these materials can change their mechanical rigidity in static or dynamic systems to extend their workspace. [1-4] Multiple strategies have been pursued recently to achieve stiffness tunability, including pneumatic jamming, [3,5,6] chemical interactions, [7] opposing actuator structures, [8-10] magnetorheological fluids, [11,12] external/internal heating of materials with phase change [13-24] or glass transition, [25-28] or through combinations of these techniques. [13,29] Among phase-changing materials, low melting point alloys (LMPA) have been used widely as they are highly electrically conductive, rigid as metal at room temperature, and their melting point can be as low as 47.2 C [21] or 62.0 C. [20] LMPA layers, channels, foams, lattices, and particles have been incorporated as fillers into soft elastomers and shape memory polymers to create engineering materials with stiffness tunability. [13,17,18,20-23] In addition to tuning mechanical stiffness, LMPA fillers can also enhance the thermal and electrical properties of the composites. [18,30,31] Another example of smart composites with tunable stiffness containing phase-changing components is conductive propylene-based elastomers (CPBE), [24] which have a propylene-ethylene copolymer elastomer matrix and dispersed

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“…SMPs first originated in the 1960s as shrinkable fittings and have generated numerous reviews since. 136,[138][139][140][141][142][143][144][145][146] In addition to the thermoresponsive SMPs, there are several examples of SMPs that respond to light, chemicals and magnetic and electric fields. 139 Three classes of SMPs form the bulk of the literature:…”

Section: State Of the Artmentioning

confidence: 99%

Stimuli‐responsive mechanical properties in polymer glasses: challenges and opportunities for defense applications

Dennis

Savage

Mrozek

et al. 2020

Polymer International

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The potential utility that responsive glasses provide in the areas of aeronautics, protection and unmanned systems is reviewed in this article. The article focuses on two broad classes of stimuli, photo and thermal, to better illustrate the challenges and convey some of the potential in developing these materials for the often extreme operational environments of defense applications. Three response mechanisms are outlined to provide a range of mechanical behaviors on demand: (i) shape-changing functionalities which locally yield or soften the material to stimulate chain mobility; (ii) bond forming (or breaking) chemistries which increase (or decrease) the stiffness of the material; and (iii) energy absorbing groups which convert the incoming stimuli into a spatially controlled heating and result in a designed softening of the material. Overall, continuing to develop responsive polymer glasses that respond rapidly and efficiently under low energy inputs will be critical for future defense applications.

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Shape memory ionomers

Cited by 34 publications

References 54 publications

A comprehensive review of the structures and properties of ionic polymeric materials

A comprehensive review of the structures and properties of ionic polymeric materials

Robust Three‐Component Elastomer–Particle–Fiber Composites with Tunable Properties for Soft Robotics

Stimuli‐responsive mechanical properties in polymer glasses: challenges and opportunities for defense applications

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