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TitleCarbon nanofiber type and content dependence of the physical properties of carbon nanofiber reinforced polypropylene composites
Author(s)Lanceros-Méndez, S.
Paleo, A. J.
Sencadas, V.
Hattum, F. W. J. van
Ares-Pernas, A.
Carbon nanofibers
Mechanical properties, thermal properties, electrical properties
Thermal properties
Electrical properties
Issue date2014
JournalPolymer Engineering and Science
Abstract(s)The variation of the physical properties of different carbon nanofibers, CNFs, based-polymer nanocomposites processed by twin-screw extrusion , TSE, was investigated. Nanocomposites fabricated with CNFs with highly graphitic outer layer revealed electrical isolation-to-conducting behaviour as function of CNFs´content. Nanocomposites fabricated with CNFs with an outer layer consisting on a disordered pyrolitically stripped layer, in contrast, revealed better mechanical performance and enhanced thermal stability. Further, CNFs´ incorporation to the polymer matrix increased the thermal stability and the degree of crystallinity of the polymer, independently on the filler content and type. In addition, dispersion of the carbon nanofibers´ clusters in polypropylene composites was analysed by transmitted light optical microscopy, LOM, and greyscale analysis, GSA. The results showed a correlation between the filler concentration and the variance, a parameter which measures quantitatively the dispersion, for all composites. This method indicated a value of 1.4 vol % above which large clusters of CNFs cannot be dispersed effectively and as a consequence only slight changes in mechanical performance are observed. Finally, this study establishes that the physical properties of carbon nanofiber based-polymer nanocomposites can be tailored as function of both adequate CNFs´ structure and content.
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Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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