Fabrication and evaluation of epoxy nanocomposites and carbon/epoxy composite laminates containing oxidized carbon nanofibers / Don Klosterman in SAMPE JOURNAL, Vol. 43, N° 4 (06-07/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 4 (06-07/2007) . - p. 7-17 Titre : Fabrication and evaluation of epoxy nanocomposites and carbon/epoxy composite laminates containing oxidized carbon nanofibers Type de document : texte imprimé Auteurs : Don Klosterman, Auteur ; Melissa Williams, Auteur ; Chris Heitkamp, Auteur ; Regina Donaldson, Auteur ; Charles Browning, Auteur Année de publication : 2007 Article en page(s) : p. 7-17 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Vapor grown carbon nanofibers (VGCF) were dispersed into an epoxy/amine resin at a level of 8 wt% using a high shear, solvent-free process. Six batches of VGCF which differed in the amount of surface oxidation were used in this study, in addition to two control batches of non-oxidized VGCF. The resulting resin mixtures were evaluated for dispersion quality, and then cured under heat and pressure to form solid plaques. Samples were then evaluated for glass transition temperature (Tg), flexure strength, and impact strength. The dispersion quality varied from batch to batch, with batches containing oxidized VGCFs generally containing fewer and smaller agglomerated nanofibers than those containing non-oxidized VGCFs. The Tg values of the nanocomposites were the same or up to 7°C higher than a neat resin sample. Flexure modulus and strength varied from batch to batch, but one batch showed a 237% increase in modulus and 29% increase in flexure strength over neat resin. This same batch also exhibited a 24% increase in Izod impact strength compared to neat resin, although other batches performed more poorly than neat resin. Additional nanofiber/resin mixtures were prepared and used to demonstrate the production of carbon fiber composite laminates using a Resin Film Infusion technique. The impact strength of the carbon fiber laminates containing VGCFs was about 73% higher than those containing no VGCF. However, these results are initial, and fiber volume fraction and void content differences may be partly responsible for variation in impact strength. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Processing of epoxy nanocomposites - Processing of advanced composites - CHARACTERIZATION : Surface oxidation - Dispersion - Glass transition temperature (Tg) - Flexure properties - Impact properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23410 [article]

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