Bioinspired Healable Mechanochromic Function from Fluorescent Polyurethane Composite Film

Song, Xiaoke; Wang, Junpeng; Song, Yan; Qi, Tao; Li, Guo Liang

doi:10.1002/open.201900295

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…By slight design adjustment, this system can be applied as a finger motion sensor, encryption device, dynamic display, and thermal camouflage. This mechanochromism design strategy based on the strain-dependent crack width has been widely adopted by other researchers − after its first report, leading to widespread applications in photonic-electronic skins, , triboelectric nanogenerators with motion sensing, , and optical strain sensors. ,− For example, Guo et al invented a mechanoluminescent material, consisting of a carbon nanotube/cellulose nanocrystal composite film and a self-healable supramolecular elastomer substrate . This material can exhibit mechanical-responsive PL for strain sensing because of the presence of dynamic strain-dependent microcracks on the film layer.…”

Section: Mechanochromism Based On Strain-dependent Crack Widthmentioning

confidence: 99%

Smart Soft Materials with Multiscale Architecture and Dynamic Surface Topographies

et al. 2022

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Conspectus Smart soft materials have one or more characteristics that can be significantly altered in convertible fashions by external stimuli, such as light, moisture, mechanical force, temperature, electric/magnetic fields, pH, and so on. These materials can lead to widespread application in multifunctional smart devices. Recently, various smart soft materials have been developed under the inspiration of the intriguing multiscale structures, adaptive mechanisms, and dynamic responses of natural life, with an aim to further design advanced material systems with novel, intriguing, and unprecedented properties. Herein, inspired by the fascinating visual display strategies and adaptive mechanisms in animals and plants, we have fabricated a series of smart soft material-based devices that can respond to external stimuli with instantaneous and reversible fashions in optical, electrical, mechanical, and/or shape deformation signals. These devices can be fabricated for widespread applications, including smart windows, encryption devices, thermal camouflage, wearable strain sensors, anticounterfeit tabs, 3D stretchable electronics, dynamic displays, rewritable media, human–machine interfaces, and so on. The key to successfully achieving those intriguing characteristics in these smart material systems lies in the function-orientated structural design, which integrates bioinspired design and surface engineering with multiscale architecture as the crucial elements. In this Account, we provide a summary, with a main focus on our own work, of the recent advances in the bioinspired smart soft materials fabricated on the basis of 2D or 3D film–substrate multilayered structures. These materials are characterized by convertible topographies like dynamic cracks, folds, stimuli-responsive wrinkles, and other analogous structures. Those topographies are responsible for the dynamic stimuli-responsive optical, electrical, and mechanical properties demonstrated in the system, such as strain-dependent light scattering effect, mechanical tunable light shielding properties, moisture/mechanically/photothermally tunable surface reflectance, moisture/mechanically responsive resistance, etc. Besides, those 2D functional materials can be further evolved into shape adaptive 3D structures via strain relaxation methods. These systems demonstrate high design flexibility, excellent reversibility, and wide applicability, which can pave new routes for designing next generation smart soft materials equipped with versatile, tunable, adaptable, and interactive stimuli-responsive properties.

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Section: Mechanochromism Based On Strain-dependent Crack Widthmentioning

confidence: 99%

Smart Soft Materials with Multiscale Architecture and Dynamic Surface Topographies

et al. 2022

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“…To date, optomechanistic research of large-scale damage sensing has predominantly focused on incorporating mechanochromic compounds for strain sensing of neutral polymeric systems. − Many studies ranging from use of neutral mechanochromic sensors that rely on aggregation-induced emission processes (AIE) and , dynamic covalent bond alterations, − among others, , have been evaluated for sensing. Weder and coworkers have reported an encapsulated solvatochromic dye as a probe to provide optical information based on polarity changes from surrounding polymer damage .…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Ionic Probe for Determination of Mechanical Properties of Healed Poly(ethylene-co-methacrylic acid) Ionomer Films

Ayala

Pérez

Mathaga

et al. 2022

ACS Appl. Polym. Mater.

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In recent years, advanced materials with properties resembling biological systems, particularly artificial muscles, have received intense scrutiny. This is because the interesting conformational shape characteristics of such materials have benefited a variety of technologies, including textiles, 3D printing, and medical devices. Although a multitude of shape memory properties have been studied and developed in recent years, self-healing of these polymers after puncture or rupture has also become a major area of study. Most techniques for detection of such processes are mechanically based and require considerable hands-on monitoring. Thus, a rapid visual detection method for self-healing is highly desirable. Herein, we describe fluorescence studies for rapid detection of self-healing properties of a partially neutralized sodium ionomer poly(ethylene- co -methacrylic acid) (PEMA). In this study, two different fluorophores, parent non-ionic 4,6-dipyrenylpyrimidine and ionic 4,6-dipyrenylpyrimidinium iodide fluorophores, were evaluated as possible sensors of self-healing. Incorporation of these probes via solution blending and compatibility into a PEMA of these fluorophores were evaluated. Thermal characterizations using differential scanning calorimetry were also performed to elucidate physical characteristics of healed sites. Ratiometric fluorescence emission variations were explored within puncture-healed ionomer films and related to Young’s modulus properties with good linearity, indicating potential utility of this approach for monitoring elastic modulus properties after healing has occurred. Further statistical analyses of mechanical processes using quadratic discriminant analysis resulted in development of several highly accurate predictive models for determining time since damage healing.

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“…Recently, significant interest has been directed to the development of fluorescent polymers, because of their intrinsic advantages, including low toxicity, good biocompatibility, long-term stability and better processability [1][2][3]. In particular, fluorescent polyurethane (PU) is one of the most desirable polymers, owing to its outstanding combination of unusual features, such as excellent mechanical strength, good abrasion resistance, and high elasticity [4][5][6][7]. These facilities make the materials useful for technological applications in a very broad range of fields, such as coating materials, textiles, paper making, organic light emitting diodes (LEDs), and fluorescent probes.…”

Section: Introductionmentioning

confidence: 99%

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

et al. 2020

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Rhodamine derivatives (RDs) with three reactive hydrogens were synthesized and well characterized by Fourier transform infra-red spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectra (ESI mass). Then, the obtained RD was covalently cross-linked into polyurethane (PU) matrix through chemical linkages to fabricate a network structure, and the fluorescent properties, mechanical properties, thermal stability, and emulsion particle size were systematically investigated. Results demonstrate that PU-RD maintains initial fluorescent properties and emits desirable yellow fluorescence under ultraviolet irradiation. Moreover, compared with linear PU without fluorescers, PU-RD shows clearly improved mechanical properties and thermal stability, on account of the formed network structures.

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Bioinspired Healable Mechanochromic Function from Fluorescent Polyurethane Composite Film

Cited by 5 publications

References 51 publications

Smart Soft Materials with Multiscale Architecture and Dynamic Surface Topographies

Smart Soft Materials with Multiscale Architecture and Dynamic Surface Topographies

Fluorescent Ionic Probe for Determination of Mechanical Properties of Healed Poly(ethylene-co-methacrylic acid) Ionomer Films

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

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