Integrating self‐healing capabilities into soft electronic devices increases their durability and long‐term reliability. Although some advances have been made, the use of self‐healing electronics in ...wet and/or (under)water environments has proven to be quite challenging, and has not yet been fully realized. Herein, a new highly water insensitive self‐healing elastomer with high stretchability and mechanical strength that can reach 1100% and ≈6.5 MPa, respectively, is reported. The elastomer exhibits a high (>80%) self‐healing efficiency (after ≈ 24 h) in high humidity and/or different (under)water conditions without the assistance of an external physical and/or chemical triggers. Soft electronic devices made from this elastomer are shown to be highly robust and able to recover their electrical properties after damages in both ambient and aqueous conditions. Moreover, once operated in extreme wet or underwater conditions (e.g., salty sea water), the self‐healing capability leads to the elimination of significant electrical leakage that would be caused by structural damages. This highly efficient self‐healing elastomer can help extend the use of soft electronics outside of the laboratory and allow a wide variety of wet and submarine applications.
Smart polymer design can be used to combine both a highly flexible and hydrophobic domain with a hard and dynamic one. This results in a highly water‐insensitive and self‐healing elastomer that can be used for soft electronic applications that work in both ambient and aqueous conditions and show great self‐healing capabilities in terms of electrical and mechanical properties.
Duroplaste, Thermoplaste und Elastomere sind bewährte Kunststoffe mit klar definierten Eigenschaften. Zunehmend interessieren sich Materialwissenschaftler jedoch für adaptive dynamische Netzwerke. ...Solche Netzwerke reagieren auf Reize mit Änderungen in ihren Eigenschaften und können somit das Leistungsspektrum von normalen Kunststoffen erweitern und ergänzen.
El presente trabajo se realizó con el objetivo de evaluar el fenómeno de histéresis hidráulica en emisores y cintas de riego autocompensantes. Los modelos de emisores evaluados fueron el Vip Line con ...caudal nominal de 3.9 L/h, el Naan PC con caudal nominal de 4 L/h y la Cinta de riego Aqua Traxx. Se realizó la determinación de la curva caudal - presión midiendo el fenómeno de histéresis en sentido retroverso. El elastómero en los emisores autocompensante influye en la presencia del fenómeno de la histéresis hidráulica, además resultan afectados por el fenómeno de la histéresis del material, aspecto este que se observa en la diferencia de las curvas q= f(h) registradas con presiones ascendentes y descendentes y cuyas ecuaciones son del tipo polinómicas obtenidas en condiciones experimentales con coeficientes de relación superiores al 90%. Palabras clave: presión, caudal, eslastómero, curvas, ecuaciones. This work was carried out at "Ceballos" Citrus Company with the objective of evaluating the phenomenon of hydraulic hysteresis in emitters and self-compensating irrigation tapes. The emitter models Vip Line with a nominal flow of 3.9 L/h and Naan PC with a nominal flow of 4 L/h were evaluated as well as the Aqua Traxx Irrigation Tape. The determination of the flow-pressure curve was performed by measuring the hysteresis phenomenon in the backward direction. These self-compensating emitters are affected by the phenomenon of hysteresis of the material, an aspect that is observed in the difference of the curves q = f (h) registered with ascending and descending pressures and whose equations are of the polynomial type obtained in experimental conditions with coefficients of relation higher than 90%. Keywords: pressure, flow, elastomer, curves, equations.
Most of elastomers for fabrication of comfortable epidermal devices and smart actuators produce responsive signals by the stimuli‐induced deformation. Herein, a dynamic visualization of external ...stimuli rather than the deformation through synthesis of a self‐healing poly(dimethylsiloxane) (PDMS)‐based elastomer doped with aggregation‐induced emission (AIE) molecules is reported. The self‐healing PDMS‐based elastomer is designed and synthesized through molecule integration of reversible multi‐strength H‐bonds and permanent covalent crosslink sites. The adjustment of the weight ratio of elastic cross‐linker offers tunable mechanical properties of the resultant elastomer. After doping such an elastomer with AIE molecules of 1,1,2,2‐tetrakis(4‐nitrophenyl)ethane, the elastomer composite displays strong on–off fluorescence depending upon mechanical damage and temperatures, which can be used to detect the breaking and self‐healing performances, as well as the temperature change. The strategy described here provides another way to develop smart polymeric elastomers for practical applications.
Herein, a dynamic visualization of external stimuli rather than the deformation through synthesis of a self‐healing PDMS‐based elastomer doped with aggregation‐induced emission molecules is reported. The elastomer composite displays strong on–off fluorescence depending upon mechanical damage and temperatures, which can be used to detect the breaking and self‐healing performances, as well as the temperature change.
An innovative self‐healing polydimethylsiloxane (PDMS) elastomer, namely, PDMS‐TFB, is reported by incorporating the reversibly dynamic imine bond as the self‐healing points into the PDMS networks. ...The PDMS‐TFB elastomer features good optical transmittance (80%) in full visible light region, high stretchability (≈700%), and excellent autonomous self‐healing ability at room temperature. Surprisingly, the self‐healing behavior can take place in water and even at a temperature as low as −20 °C in air, showing a promising outlook for broader applications. As a proof‐of‐concept, this study demonstrates the use of the PDMS‐TFB elastomer for preparing anticorrosion coating and adhesive layer, and also the use of such an elastomer to be the platform for fabricating the flexible interconnector and chemical sensor. Remarkably, no significant difference is observed between the pristine and healed samples. Taking full advantage of these unique properties, it is anticipated that such a PDMS‐TFB elastomer shows wide applications in the fields of materials science, electronics, biology, optics, etc.
Autonomous self‐healing poly(dimethylsiloxane) elastomer with high optical transmittance (80%) and stretchability (≈700%) is prepared by simply mixing triformylbenzene and amine‐terminated poly(dimethylsiloxane), showing rapid and efficient self‐healing capability both in air and water over a broad temperature region. As a proof‐of‐concept, such an elastomer is used as the anticorrosion layer, reusable adhesive, and platforms for self‐healing and flexible interconnectors and chemical sensors.
Blends of poly(lactic acid) (PLA) and amine-terminated butadiene-acrylonitrile (ATBN) elastomer were prepared by solution with ATBN contents of 8-20 wt%. Films were molded by liquid deposition ...modeling 3D printing, Fourier transform infrared (FTIR) spectroscopy showed that the terminal carboxylic groups of the PLA chains reacted with the terminal amino groups of ATBN. Water was the byproduct of this reaction, causing PLA hydrolysis and accelerating the reaction. Thermogravimetric analysis (TGA) showed that components interaction caused a loss of PLA thermal stability. Scanning electron microscopy (SEM) of the blends revealed a porous morphology and no phase separation. There was change in the elongation when compared with neat PLA. Although the addition of a telechelic elastomer could improve PLA toughness, any benefits arising from such addition seem to be neutralized by PLA chain scission due to hydrolysis and porosity, resulting from the condensation reaction.
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