Couleurs de polymères chargés pour un environnement lumineux : Application à la recherche par le design de matériau à changement chromatique

Abstract : The colour of filled polymers, used in flooring applications for a given lighting environment, can be dealt either with a perceptual approach or with an optical and spectral method. This thesis experimentally investigates the second option. The characterizations of calendered composite films lead to a better understanding about how the types of polymers and pigments, their volumetric concentration, and surface embossing, influence the visual aspect. On the one hand, no formulation made from PVC can be matched in colour with a new one made from PE, owing to a strong relationship between luminance and chrominance. In addition to the internal losses within fillers, the refractive index mismatch between matrix and fillers do account for chromatic variations amongst the materials. On the other hand, embossing materials with controlled surface roughness, which is measured by a confocal scanning system and AFM, proves that the luminance L*, measured by gonio-spectro-colorimetry, depends on all the roughness scales. Modelling the reflected L* based on geometric laws quantifies the variations in L* depending on the topography and the scan direction of the material. The influence of lighting on colour has been studied with a halogen and a LED light sources. The colorimetry of PVC colored materials reveals the need for a spectral approach in order to determine the origin of metamerism and to enhance its effects, by combining perceptual and quantitative methods within CIE-L*a*b* space. Matching the emission spectra of the illuminants, the reflectance spectra of the materials and those of the observer sensitivity, is the main result leading to the design of a new color-changing material. The color change has been characterized and qualitatively approved in a human-scaled box, where light reflection and scattering occurs from the walls. New flooring typologies have eventually stemmed from the research by design, putting forward a material that can tune its pattern with the lighting atmosphere. Making prototypes does not necessary lead to innovation. However, new ways, new thoughts about flooring in inner spaces may be brought forth by the strong visual change that has been obtained.
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Benjamin Goffette. Couleurs de polymères chargés pour un environnement lumineux : Application à la recherche par le design de matériau à changement chromatique. Autre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0017⟩. ⟨pastel-00874665⟩

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