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Etude de la fonctionnalisation de polyuréthannes : effet du spiropyranne sur leurs propriétés optiques et mécaniques

Abstract : Nowadays, photochromic fibers and films are turned towards the development of intelligent smart materials which are applied to evaluate, signalize and react to a change in color and absorbance spectra. In this work, the photochromic activity of six commercial grades of polyurethane that contains small quantities of spiropyran [1-hexyle-3,3-diméthyle-6'-nitrospiro (indoline-2',2'-benzopyran)] has been studied. The effects of film thickness, irradiation time, and SP concentration on the photochromic response of PU/SP films have been studied and also their couplings. Furthermore, the photochromic behaviors of these films under stretching and their decoloration kinetics have been investigated. The kinetics and characterization of the photochromic system of spiropyran incorporated into polyurethane and irradiated with monochromatic light was modeled. The obtained models can be correctly applied in all cases (with and without irradiation, with and without stretching), in particular for all SP mass ratios and for all film thickness. The mechanical behavior of polyurethanes and its relation with the photochromic properties is studied and modeled. This model has the capability to determine the stretching ratio which can be translate to the local compression by employing only four photochromic measurements and this open the way for a wide range of potential applications. Of particular interest in this context are the textiles used for biomedical applications, including graduated compression stockings for preventing or treating deep vein thrombosis. Another related application is the recent development of special sport clothing for improving recovery after strong efforts
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Ahmed Abd El Kader Abdo Bhran. Etude de la fonctionnalisation de polyuréthannes : effet du spiropyranne sur leurs propriétés optiques et mécaniques. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL023N⟩. ⟨tel-01748895⟩

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