Energy harvesting by uniaxially stretched Poly(lactic acid) film at low strain frequency for powering wearable sensors: Experimental results and theoretical extrapolation
| Autor: | Mohamed Aymen BEN ACHOUR, Mohamed Rguiti, Cédric Samuel, Sophie Barrau, Marie-France Lacrampe, Christian Courtois |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Smart Materials and Structures. |
| ISSN: | 1361-665X 0964-1726 |
| DOI: | 10.1088/1361-665x/acd972 |
| Popis: | Poly(lactic acid) (PLA) is an eco-friendly and low-cost polymer with an shear piezoelectricity classically induced by a simple uniaxial stretching and without poling process. These interesting properties make PLA as a good candidate to replace the widely used PVDF piezoelectric polymer, particularly for flexible energy harvesting applications aiming to power wearable sensors. In this work, PLA films were fabricated by a simple extrusion and uniaxial stretching process. The energy harvesting efficiency of the PLA films were characterized using a test bench designed for flexible materials based on the piezoelectric 31-mode at low frequencies. The measurements on PLA films show a maximum electrical power about 3.7 µW harvested by applying a strain of 1% amplitude at 20 Hz. A theoretical model was developed based on electromechanical parameters to ascertain the energy harvesting behaviour of PLA. The validated model was also helpful to estimate the electrical output power from PLA films by increasing the active surface area and for the potential improvement of piezoelectric shear coefficient (d14). The optimized PLA film could then produce an electrical power comparable to that produced by PVDF film in the same mechanical excitation conditions. This study then highlights the potential of the developed model to estimate the electrical power generated by piezoelectric polymer film for energy harvesting applications. |
| Databáze: | OpenAIRE |
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