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Article Dans Une Revue Polymers for Advanced Technologies Année : 2022

Evaluation of shear piezoelectric coefficients by a bimorph cantilever technique for extruded and oriented poly( l ‐lactide) films

Résumé

Uniaxially stretched poly(l-lactide) (US-PLA) films display shear piezoelectric properties of interests for smart applications. However, the measurement of these properties is quite challenging and a simple technique based on bimorph cantilevers is here used. This technique is validated with commercial piezoelectric poly(vinylidene fluoride) (PVDF) films. A piezoelectric coefficient d31 close to 19 pm/V is then obtained with a precision close to 5% and a good accuracy to expected values. For US-PLA films made by extrusion—machine-direction orientation, shear piezoelectric coefficients d14 up to 5.9 pm/V are found. Relevant trends can be captured but a low precision on d14, close to 10%, is highlighted. This behavior is probably related to film thickness heterogeneities arising from the extrusion processing at the laboratory scale. Piezoelectric voltage coefficients (g14) and electromechanical coupling coefficients could be also easily obtained with additional measurements of the dielectric permittivity and mechanical compliance. Outstanding g14 coefficients up to 320 mV.m/N are confirmed for US-PLA films with a precision close to 20%. The bimorph cantilever technique consequently represents a simple and reliable technique to evaluate piezoelectric properties of soft materials, in particular shear piezoelectric properties of US-PLA films for future developments and optimizations at the pilot scale.
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Dates et versions

hal-03891299 , version 1 (09-12-2022)

Identifiants

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Mohamed Aymen Ben Achour, Cédric Samuel, Mohamed Rguiti, Sophie Barrau, Christian Courtois, et al.. Evaluation of shear piezoelectric coefficients by a bimorph cantilever technique for extruded and oriented poly( l ‐lactide) films. Polymers for Advanced Technologies, 2022, Polymers for Advanced Technologies, 34 (3), pp.939-947. ⟨10.1002/pat.5942⟩. ⟨hal-03891299⟩
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