| Titre : |
The effect of physical aging on the mechanical properties of raw, treated and compatibilized coir fibers-based polyisoprene bio-composites |
| Type de document : |
texte imprimé |
| Auteurs : |
C. A. Kakou, Auteur ; M. Raji, Auteur ; H. Abdellaoui, Auteur ; R. Bouhfid, Auteur ; A. Qaiss, Auteur ; Denis Rodrigue, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 429-439 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Caractérisation
Composites à fibres -- Propriétés physiques
Composites à fibres végétales
Composites à fibres végétales -- Propriétés mécaniques
Essais dynamiques
Fibres de coco
Matériaux hybrides
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The production of bio-composites based on vulcanized rubber reinforced by natural fibers has been widely studied. However, the aging phenomenon occurring during the long-term storage generating irreversible damage is limiting the performance of this kind of composites which has not been studied in details. So the objective of this work was to characterize and understand the structure-mechanical property relationships in these bio-composites and to correlate the effective crosslinking density with physical aging as a function of fiber content (0, 20, 30 and 40 wt.%) and fiber surface modification (alkali treatment) for the system polyisoprene (PI) and coir fibers. Furthermore, interfacial adhesion was improved by using maleic anhydride grafted polyisoprene as a coupling agent. From the samples produced, a complete set of morphological (scanning electron microscopy) and mechanical (shear and tension) characterization was performed before and after natural aging. The results showed that the tensile modulus increased with fiber content for the range of conditions studied and the presence of a coupling agent always gave higher tensile strength due to better interfacial stress transfer. However, important elasticity loss (strain at break) was observed due to the low fiber elasticity. Finally, different physical aging mechanisms led to changes in the molecular configuration and a reduction of free volume caused by a post-curing phenomenon of the polyisoprene matrix and low environmental stability of the fibers. These phenomena were shown to increase the Young's modulus of the neat matrix by eight times compared to the unaged neat polyisoprene, but a smaller variation (five times) was observed for the bio-composites which was related to different crosslinking density and coir fibers state of dispersion in the vulcanized matrix. |
| Note de contenu : |
- EXPERIMENTAL DETAILS : Materials - Fiber preparation - Composite preparation
- CHARACTERIZATION : Physical properties of the composites - Structural properties - Morphological properties - Tensile testing - Shear sandwich test
- RESULTS AND DISCUSSION : Physical properties of the composites - Structural properties - Morphological properties - Tensile properties - Shear sandwich test |
| DOI : |
https://doi.org/10.3139/217.3947 |
| En ligne : |
https://drive.google.com/file/d/1AoCJOu0UPZkf_QTagGNadu6jzhERomMg/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35065 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 429-439
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