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http://hdl.handle.net/10773/20024
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ghislandi, Marcos | pt |
dc.contributor.author | Prado, Luis A. S. de A. | pt |
dc.contributor.author | Schulte, Karl | pt |
dc.contributor.author | Barros-Timmons, Ana | pt |
dc.date.accessioned | 2017-12-07T19:32:55Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0022-2461 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20024 | - |
dc.description.abstract | The effect of carbon nanofiber (CNF) functionalization on the thermo-mechanical properties of polyamide-12/CNF nanocomposites was investigated. Three main different surface treatments were performed to obtain CNF-OH (OH rich), CNF-Silane (C6H5Si-O-), and CNF-peroxide. CNF modified with poly-(tert-butyl acrylate) chains grown from the surface via ATRP (atom transfer radical polymerization) were also prepared and tested. The modified CNFs and neat CNFs were used as fillers in polyamide-12 nanocomposites and the properties of the ensuing materials were characterized and compared. Universal tensile tests demonstrated a substantial increase (up to 20 %) of the yield strength, without reduction of the final elongation, for all functionalized samples tested within 1 wt% filler content. Further evidences of mechanical properties improvement were given by dynamic mechanical thermal analyses. CNFs functionalized with poly-(tert-butyl acrylate) and silane exhibited the best performance with stiffening and strengthening at low (a parts per thousand currency sign1 wt%) filler loadings, via a partial decrease of the intensity of beta-transitions attributed to favorable interactions between the functional groups on the surface of functionalized CNFs and polyamide-12. CNFs treated with peroxide proved to be the most simple preparation technique and the ensuing nanocomposites exhibited the highest storage modulus at high (5 wt%) filler content. Theoretical simulations using the micro-mechanics model were used to predict the Young modulus of the composites and compare them with experimental data. The results obtained suggest a synergistic effect between the matrix and the filler enhanced by surface functionalization. | pt |
dc.language.iso | eng | pt |
dc.publisher | SPRINGER | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | WALLED CARBON NANOTUBES | pt |
dc.subject | TRANSFER RADICAL POLYMERIZATION | pt |
dc.subject | MECHANICAL-PROPERTIES | pt |
dc.subject | SURFACE MODIFICATION | pt |
dc.subject | CRYSTALLIZATION BEHAVIOR | pt |
dc.subject | NANOCOMPOSITES | pt |
dc.subject | DISPERSION | pt |
dc.subject | FIBERS | pt |
dc.subject | OXIDATION | pt |
dc.subject | PLASMA | pt |
dc.title | Effect of filler functionalization on thermo-mechanical properties of polyamide-12/carbon nanofibers composites: a study of filler-matrix molecular interactions | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 8427 | pt |
degois.publication.issue | 24 | pt |
degois.publication.lastPage | 8437 | pt |
degois.publication.title | JOURNAL OF MATERIALS SCIENCE | pt |
degois.publication.volume | 48 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1007/s10853-013-7655-4 | pt |
dc.identifier.doi | 10.1007/s10853-013-7655-4 | pt |
Appears in Collections: | CICECO - Artigos |
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