PVDF/carbon nanotubes/nanoclay composites for piezoelectric applications / F. Sadeghi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 81-87 Titre : PVDF/carbon nanotubes/nanoclay composites for piezoelectric applications Type de document : texte imprimé Auteurs : F. Sadeghi, Auteur ; A. Sarvi, Auteur Année de publication : 2014 Article en page(s) : p. 81-87 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Conduction électrique Matériaux piézoélectriques Nanoparticules Nanotubes Polyfluorure de vinylidène Index. décimale : 668.4 Plastiques, vinyles Résumé : Poly(vinylidene) fluoride (PVDF) nanocomposite samples were prepared by incorporation of carbon nanotubes (CNT) and nanoclay into PVDF using a twin screw extruder. Carbon nanotube was added to improve electrical conductivity and nanoclay was included to enhance ? crystal formation for piezoelectric property. X-ray diffraction (XRD) results showed that partial melt intercalation of PVDF in clay was achieved. The XRD results also revealed that CNT and nanoclay addition increased ? phase crystal amount in PVDF. FTIR spectroscopy measurements confirmed the XRD results and showed that the effect of nanoclay on ? phase crystal formation of PVDF was more prominent than CNT. It was found that shear rate applied during crystallization would improve ? phase crystal formation but only for the neat PVDF. Electrical conductivity results showed that addition of CNT improved conductivity as a percolation of 2 wt.% was observed. It was found that dispersion of CNT into PVDF matrix is very crucial for obtaining a higher conductivity. The results showed that clay incorporation into CNT nanocomposite improved electrical conductivity. The TEM micrographs showed bundles of CNT were adhered to clay particles. That was considered an indication of affinity between CNT and organically modified clay. The results of compounding of CNT and nanoclay with PVDF in batch mixer also revealed improvement in electrical conductivity when clay was added into PVDF/CNT composite in melt state. The conductivity improved with mixing time for both systems: PVDF/CNT and PVDF/CNT/nanoclay. DOI : 10.3139/217.2814 En ligne : https://drive.google.com/file/d/1YsykA23ulz28dDPDMkD1Q1fvS2H_zcv4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20578 [article]

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Structure, mechanical and barrier properties of uniaxially stretched multilayer nylon/clay nanocomposites / F. Sadeghi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 565-573 Titre : Structure, mechanical and barrier properties of uniaxially stretched multilayer nylon/clay nanocomposites Type de document : texte imprimé Auteurs : F. Sadeghi, Auteur ; Abdellah Ajji, Auteur Année de publication : 2012 Article en page(s) : p. 565-573 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Construction sandwich -- Propriétés mécaniques Couches minces multicouches Matériaux -- Propriétés barrières Matériaux hybrides Polyamide 6 Polyéthylène basse densité linéaire Index. décimale : 668.4 Plastiques, vinyles Résumé : Multilayer films consisting of a core layer of nylon 6 (PA6) sandwiched between two linear low density polyethylene (LLDPE) layers by using a tie layer were produced using a semi industrial cast film extrusion line. The core layer of the films was produced from neat PA6 and PA6/clay nanocomposite resins. The films were consequently uniaxially stretched in machine direction. The effect of stretching on crystalline structure, orientation as well as mechanical and barrier properties of the samples were investigated. Orientation of the films for both layers: polyethylene and nylon was assessed using FTIR (Fourier Transform Infrared Spectroscopy) and it was found that clay inclusion hindered orientation of the core nylon layer. Interaction of nylon molecules with clay influences the crystalline structure for nylon/clay nanocomposite film during the stretching as it hindered crystal transformation of γ to α phase. The effect of clay interaction on phase structure was also observed in DSC (Dynamic Scanning Calorimetry) results. Stretching improved barrier to oxygen for the samples. Oxygen transmission rate was reduced about 62.5% for the films having a nylon core and 50% for those with nylon/clay core when stretched to a draw ratio of 1.5 and remained nearly constant for higher draw ratios up to 3. Haze of the films was reduced with stretching; however the effect was more effective for the sample with neat nylon in the core layer when compared to the nylon/clay core one. Finally, it was observed that puncture resistance of the samples was improved significantly with stretching. DOI : 10.3139/217.2619 En ligne : https://drive.google.com/file/d/1LtlrO6CXk_80wihq-qJTsDj0H1Mg8RCH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16639 [article]

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