Anomalous thermally expanded polymer networks for flexible perceptual devices

Zhu, Shanshan; Wu, Pengcheng; Yelemulati, Huoerhute; Hu, Jinlian; Li, Guanglin; Li, Liangbin; Tai, Yanlong

doi:10.1016/j.matt.2021.03.010

Cited by 19 publications

(6 citation statements)

References 151 publications

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“…3 However, few NTE materials have been reported thus far. 2,3,6 The ZrW 2 O 7.91 Á0.64NH 3 compound shows NTE due to transverse motion perpendicular to the direction of the metal-oxide chains, which is known as the ''guitar string'' effect. 7 A similar contraction has also been observed for the Sc-F chains present in ScF 3 .…”

Section: Introductionmentioning

confidence: 99%

Uniaxial negative thermal expansion induced by molecular rotation in a one-dimensional supramolecular assembly with associated peculiar magnetic behavior

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Uniaxial negative thermal expansion induced by molecular rotation in a one-dimensional supramolecular assembly with associated peculiar magnetic behavior

et al. 2023

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“…Recent strategies were also directed towards synthesis of hyper-expandable porous materials with remarkable framework flexibility and record thermal expansion coefficients [197]. Zhou et al [198] synthesized guest-controlled multimode porous polymer framework based on dinuclear Cd 2 (RCOO) 4 (L py ) 4 (L py = pyridyl group) unit, which interconnected with eight neighbors through four 34pba − and four 44pba − ligands, resulting in a 3D coordination network with a uninodal 8-connected bcu topology.…”

Section: Breathing Frameworkmentioning

confidence: 99%

Thermomechanical Energy Converters for Harvesting Thermal Energy: A Review

Dimitriev¹

2023

Journal of Renewable Materials

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Thermal energy, i.e., the electromagnetic energy in the infrared range that originates from the direct solar radiation, outgoing terrestrial radiation, waste heat from combustion of fuels, heat-emitting electrical devices, decay of radioactive isotopes, organic putrefaction and fermentation, human body heat, and so on, constitutes a huge energy flux circulating on the earth surface. However, most energy converters designed for the conversion of electromagnetic energy into electricity, such as photovoltaic cells, are mainly focused on using a narrow part of the solar energy lying in the visible spectrum, while thermomechanical engines that are fueled by heat in the broad energy range and then convert it into mechanical work or store it as mechanical deformation, are paid less attention. Although the efficiency of thermomechanical devices is relatively low, they can be applied to collect waste heat which otherwise contributes to negative climate changes. In this review, operational principles of thermomechanical energy converters and a description of basic devices and materials that utilize thermal energy are given. In addition to conventional macroscopic engines, based on thermoacoustic, thermomagnetic, thermoelastic, hydride heat converters, and shape memory alloys, the emergent devices are described which are classified as smart actuators, breathing frameworks, thermoacoustic micro-transducers, nanomechanical resonators, plasmomechanical systems, and optothermal walkers. The performance of the different types of thermomechanical energy converters is described and compared.

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“…The driving method of thermal-responsive SMP is simple and convenient, [12][13][14][15] so thermal-responsive SMPs hold immense potential for diverse applications in aerospace, 16 biomedicine, 17 soft robotics, 18 and smart textiles. 19 Fan and Li 20 increased the recovery stress of SMP in the rubber state to 17 MPa, which is very beneficial for applying SMP in engineering structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and molecular dynamics study on thermal‐mechanical properties of epoxy shape memory polymers

Yang,

Liu,

et al. 2024

Journal of Polymer Science

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Experimental and molecular dynamics simulations were employed to investigate epoxy shape memory polymers' thermal‐mechanical properties and shape memory characteristics, utilizing polyether amine and modified hexanediamine as curing agents following the material prerequisites for variable stiffness fixtures. Glass transition temperature and Young's modulus of epoxy shape memory polymers are characterized by dynamic mechanical analysis. The consistency of the glass transition temperature between the simulation model and the experimental findings verified the accuracy of the molecular dynamics simulation. The uniaxial tensile simulation revealed that non‐bond energy predominantly exerts its influence in stretch. After reaching the yield stress, the weight fraction of the curing agent affects the generation of internal pores, with the yield stress of systems exhibiting substantial pores being minor. Systems characterized by a higher weight fraction of curing agents are more prone to pore formulation. Simulation of shape memory properties demonstrates that the entropy resulting from differences in molecular weight impacts the simulated system's shape fixation ratio and shape recovery ratio.

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Anomalous thermally expanded polymer networks for flexible perceptual devices

Cited by 19 publications

References 151 publications

Uniaxial negative thermal expansion induced by molecular rotation in a one-dimensional supramolecular assembly with associated peculiar magnetic behavior

Uniaxial negative thermal expansion induced by molecular rotation in a one-dimensional supramolecular assembly with associated peculiar magnetic behavior

Thermomechanical Energy Converters for Harvesting Thermal Energy: A Review

Experimental and molecular dynamics study on thermal‐mechanical properties of epoxy shape memory polymers

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