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The effect of physical aging on the mechanical properties of raw, treated and compatibilized coir fibers-based polyisoprene bio-composites / C. A. Kakou in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)
[article]
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 hybridesIndex. 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 testDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35065
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Code-barres Cote Support Localisation Section Disponibilité 22388 - Périodique Bibliothèque principale Documentaires Disponible The effect of superhydrophobic surface topography on underwater corrosion resistance of steel / Keqin Zheng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : The effect of superhydrophobic surface topography on underwater corrosion resistance of steel Type de document : texte imprimé Auteurs : Keqin Zheng, Auteur ; Jinde Zhang, Auteur ; Erin Keaney, Auteur ; Hanna Dodiuk, Auteur ; Samuel Kenig, Auteur ; Carol Barry, Auteur ; Joey Mead, Auteur Année de publication : 2021 Article en page(s) : p. 685-693 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosifs
Anticorrosion
Epoxydes
Hydrophobie
Matériaux hybrides
Métaux -- Revêtements protecteurs
Revêtements organiques
Surfaces (Physique)
TopographieIndex. décimale : 667.9 Revêtements et enduits Résumé : This article describes the study of the topography effect of superhydrophobic surfaces on the corrosion protection performance of steel through the air plastron behavior when subjected to an underwater environment. A random superhydrophobic surface was fabricated using spray coating and characterized for morphology and wettability by scanning electron microscopy (SEM) and goniometer measurements, respectively. By comparing the coated surfaces both with and without air plastron, it was found that superhydrophobicity postponed the corrosion of the coated steel specimens. This increase in corrosion protection of the superhydrophobic surface was due to the air plastron created by the superhydrophobicity in underwater immersion. Since different areas showed differing air plastron lifetimes (wetting behavior), it was assumed that the underlying topography of the superhydrophobic coating controlled the air plastron lifetime. To investigate this behavior, the micron scale topography of the different areas was studied using the technique of laser confocal microscopy over the specific areas and correlating with air plastron lifetime. Using the theoretical analysis based on superhydrophobic robustness and assuming the solid fraction is the same for different locations, it was demonstrated that the feature size [extracted by roughness analysis as root-mean-square (RMS)] correlated with the air plastron lifetime. It was confirmed from the plot of RMS and air plastron lifetime that smaller feature sizes could extend the air plastron lifetime and provide better anticorrosion performance. Note de contenu : - EXPERIMENTAL : Materials - Pretreatment of steel substrate - Preparation of superhydrophobic coating - Wettability characterization - Air plastron real-time observation - Corrosion resistance evaluation - Topography characterization
- RESULTS AND DISCUSSION : Plastron real-time observation - Corrosion resistance of superhydrophobic coatings - The effect of topography on air plastron lifetimeDOI : https://doi.org/10.1007/s11998-020-00433-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00433-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35922
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Code-barres Cote Support Localisation Section Disponibilité 22785 - Périodique Bibliothèque principale Documentaires Disponible The effect of ZnO nanoparticle filler on the attenuation of ZnO/PCL nanocomposites using microstrip line at microwave frequency / Abubakar Yakubu in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
[article]
Titre : The effect of ZnO nanoparticle filler on the attenuation of ZnO/PCL nanocomposites using microstrip line at microwave frequency Type de document : texte imprimé Auteurs : Abubakar Yakubu, Auteur ; Z. Abbas, Auteur ; F. Esa, Auteur ; P. Tohidi, Auteur Année de publication : 2015 Article en page(s) : p. 227-232 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Matériaux hybrides
Micro-ondes
Nanoparticules
Oxyde de zinc
Poly-e-caprolactoneIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper describes attenuation measurement using the modified microstrip line technique from new microwave substrate material. The magnitudes of the transmission coefficient (S21) from the microstrip measurement were used to determine the attenuation of the ZnO/PCL nanocomposites substrate with respect to different percentages of ZnO nanoparticles filler. Result from the measurement showed amongst others that as the filler content increases, the attenuation increases. The highest magnitude for attenuation was calculated for the 70% ZnO nano filler with a value of 14.92 dB and the least attenuation was calculated for the 25% ZnO nano filler, which value gave 6.72 dB which is very good for shielding applications. Transmission electron microscope (TEM) was used to analyse the average particle size of the ZnO powder used as filler in the study. The analysis showed that the average particle size was 52.7 nm. DOI : 10.3139/217.2993 En ligne : https://drive.google.com/file/d/1cOz_KRTOo2yYwtzSB0JPFlNgPWHwZMpv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23896
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Code-barres Cote Support Localisation Section Disponibilité 17180 - Périodique Bibliothèque principale Documentaires Disponible The first all-flax composite trimaran / Ludo Bosser in JEC COMPOSITES MAGAZINE, N° 84 (10/2013)
[article]
Titre : The first all-flax composite trimaran Type de document : texte imprimé Auteurs : Ludo Bosser, Auteur ; Emmanuel Poisson, Auteur ; Erwan Grossmann, Auteur ; Peter Davies, Auteur Année de publication : 2013 Article en page(s) : p. 33-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bateaux -- Matériaux
Bioplastiques
Biopolymères
Composites à fibres végétales
Construction sandwich
Lin et constituantsLe lin cultivé (Linum usitatissimum) est une plante annuelle de la famille des Linaceae cultivée principalement pour ses fibres, mais aussi pour ses graines oléagineuses. Les fibres du lin permettent de faire des cordes, du tissu (lin textile pour ses qualités anallergiques, isolantes et thermorégulateurs), ou plus récemment des charges isolantes pour des matériaux de construction. Les graines sont utilisées pour produire de l'huile de lin pour l'industrie de l'encre et de la peinture, pour la consommation humaine et animale, à cause de sa richesse en oméga 3.
Le lin est une des rares fibres textiles végétales européennes. Elle a comme caractéristiques la légereté, la rigidité et la résistance et comme particularité d'être une fibre longue (plusieurs dizaines de centimètres), par rapport aux fibres courtes (coton, chanvre) ou moyennes (laine).
Matériaux hybrides
PolyestersIndex. décimale : 668.4 Plastiques, vinyles Résumé : This article describes the design, development and manufacture of the first all-flax-fibre-reinforced composite trimaran. It focuses on the scantling determination process, the ageing tests results and the manufacturing procedures. Launched in May 2013, the trimaran has successfully completed navigation around the Brittany coast. Note de contenu : - Dimensioning
- Test programme
- Manufacturing
- Navigation
- Environmental issuesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22899
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Code-barres Cote Support Localisation Section Disponibilité 15746 - Périodique Bibliothèque principale Documentaires Disponible The grafting of PE-g-MA chains on graphene derivatives to improve tensile properties of polyethylene / M. Elhamnia in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
[article]
Titre : The grafting of PE-g-MA chains on graphene derivatives to improve tensile properties of polyethylene Type de document : texte imprimé Auteurs : M. Elhamnia, Auteur ; Ghodratollah Hashemi Motlagh, Auteur ; R. Goudarzi, Auteur Année de publication : 2017 Article en page(s) : p. 623-636 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites -- Propriétés électriques
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
Greffage (chimie)
Matériaux hybrides
Oxyde de graphite
Polyéthylène greffé anhydride maléique
Polymères -- Propriétés mécaniques
Traction (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : Polyethylene chains having functional maleic anhydride groups were grafted on several graphene derivatives. These chain grafted graphene derivatives were added to polyethylene and the properties of the obtained nano-composites were investigated. Modified Hummers' method was employed to produce graphite oxide (GO). Then amino-functionalized GO (AFGO) was prepared through the functionalization of GO by ethylenediamine. Thermally reduced GO (TRGO) was prepared by the heating of the GO in the presence of nitrogen. TRGO was amino-functionalized to obtain amino functionalized nano-graphite (AFNG). Low density polyethylene (PE) and polyethylene grafted maleic anhydride (PEgMA) nano-composites, containing 1 to 3 wt% of the obtained fillers, were produced by solution mixing. With the incorporation of amino-functionalized graphene into PEgMA, the amine groups on the graphene surface and the maleic anhydride in PE chains covalently bonded and improved the mechanical properties of the nano-composites; by comparing PEgMA nano-composite with 1 wt% AFGO and 1 wt% GO, a 155 percent enhancement in the elongation at break was observed. The modulus and tensile strength of these nano-composites increased over the pure matrix. In addition, the effect of PEgMA content in the 1 wt% AFGO nano-composites was studied and the optimum ratio of PEgMA to PE was found to be 0.40 to 0.60. At this ratio, the best mechanical properties were achieved. Also, at 2 wt% nano-filler the elongation at break of the AFNG nano-composite was higher than that of the TRGO nano-composite. AFNG created more chain grafting but AFNG exfoliates more. The electrical conductivity of TRGO powders by amino-functionalization decreased about 20 times. Therefore, the electrical conductivity of the graphene nano-composites was higher than amino-functionalized graphene nano-composites. Note de contenu : - EXPERIMENTAL : Chemicals and materials - Preparation of GO - Preparation of TRGO and CRGO - Preparation of AFNG and AFGO - Preparation of graphene based nano-composites - Analysis
- RESULTS AND DISCUSSION : Filler characterization - Nano-composite characterizationDOI : 10.3139/217.3508 En ligne : https://drive.google.com/file/d/1qjpHFf5exl-gUON-Qb1vXoqhz1400e6F/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29429
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