Influence de la mise en œuvre et du vieillissement sur la cristallinité de films PVDF

Abstract : This work is a part of the French project ISOCEL, which aims to build up a new generation of photovoltaic cell. More precisely, this study focuses on the backsheet of these panels, in order to ensure the weatherproof capacity of these films all along the lifetime of the cell. The main aim of this work is to understand the impact of the process conditions on the film crystalline structure. Indeed, this structure will govern the protective properties of the final backsheet. These films are made of a poly(vinylidene fluoride), poly(methyl methacrylate) and titanium dioxide (PVDF/PMMA/TiO2) blend, and created by a blown films extrusion process. PVDF has a semicrystalline structure which can take several forms depending on the manufacturing condition. A whole part of this work is devoted to the characterization of the film structure, especially with the Raman spectroscopy, which is the focus of the study. Different methods of spectral analysis are developed, such as the estimation of the crystalline phase ratio and spectra fitting. On the other hand, a pilot device are used to produce films with different process conditions. These films are characterized and the difference of structure are linked to the process conditions used. By this way, we show that the cooling condition have a strong influence on the film crystallization, notably on the form which can crystallize. On line Raman spectroscopy is used to characterize the film directly on the extruder, and thus understand the impact of the cooling condition
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Submitted on : Friday, March 30, 2018 - 9:55:02 AM
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  • HAL Id : tel-01754612, version 1

Citation

Marie Veitmann. Influence de la mise en œuvre et du vieillissement sur la cristallinité de films PVDF. Autre [cond-mat.other]. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0189⟩. ⟨tel-01754612⟩

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