Exterior and under glass natural weathering of hemp fibers reinforced polypropylene biocomposites: Impact on mechanical, chemical, microstructural and visual aspect properties
| Autor: | Hélène Garay, Valérie Desauziers, Célia Badji, Jean-Charles Bénézet, Anne Bergeret, J. Beigbeder |
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| Přispěvatelé: | Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Pôle RIME - Recherche sur les Interactions des Matériaux avec leur Environnement (RIME), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-IMT - MINES ALES (IMT - MINES ALES), Pôle Matériaux Polymères Avancés (Pôle MPA) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Polypropylene
Materials science Polymers and Plastics Infrared spectroscopy Weathering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Gloss (optics) 0104 chemical sciences chemistry.chemical_compound [SPI]Engineering Sciences [physics] Differential scanning calorimetry chemistry Flexural strength Mechanics of Materials Materials Chemistry Composite material Chromaticity 0210 nano-technology Chemical composition ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Polymer Degradation and Stability Polymer Degradation and Stability, Elsevier, 2018, 148, pp.104-116. ⟨10.1016/j.polymdegradstab.2017.12.015⟩ |
| ISSN: | 0141-3910 1873-2321 |
| Popis: | This work aims to investigate exterior and under glass weathering representing decking and car interior end uses of hemp fibers reinforced polypropylene (PP) biocomposites. For this reason, mechanical flexural tests were firstly performed. Then, the evolution of the PP matrix microstructure was determined through Differential Scanning Calorimetry (DSC). The chemical composition was studied by infrared spectroscopy to understand the photo- and thermo-chemical mechanisms. CIELab system-based colorimetric measurements were carried out to determine the evolution of the chromaticity and lightness. Through a new approach, gloss was obtained by determining the type of reflection of materials as either specular or diffuse, and the surface aspect was characterized by rugosimetry. The influence of the rate of hemp fibers (from 0 to 30 wt%) was studied. Results showed that biocomposites were generally more sensitive than neat PP whatever the weathering conditions. However, each type of weathering assessment allowed understanding the contribution of each degradation factor. Indeed, rainfall or UV-A rays induced an increase in the vinyl concentration and the formation of cracks on the surface whereas the carbonyl functional groups rate was not influenced by the type of weathering. The high temperatures under windshield glass favored a chemicrystallization and biocomposites yellowing at the first period of exposition whereas outdoor exposure induced red color loss. |
| Databáze: | OpenAIRE |
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