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    Item type:Publication, Access status: without files ,
    Multiwall carbon nanotube/epoxy composites produced by a masterbatch process
    (2006-09)
    Wichmann, Malte Hendrik Georg
    ;
    Sumfleth, Jan
    ;
    Fiedler, Bodo
    ;
    Gojny, Florian H.
    ;
    Schulte, Karl
    A masterbatch process based on a minicalander (three-roller mill) and a vacuum dissolver was developed in order to produce multiwall carbon nanotube/epoxy composites with loading fractions of 0.5, 1.0, and 2.0 wt.%. TEM and SEM analyses were performed to investigate the dispersion results. A contrast imaging in the SEM backscattering mode revealed a homogeneous distribution of carbon nanotubes in the whole volume of the material. Furthermore, an interesting correlation was found to exist between the network structure formed by the nanotubes in the epoxy matrix and the appearance of fracture surface of the nanocomposites. Furthermore, the nanocomposites exhibited an electrical conductivity in the regime of some 10-2 S/m.
    Publicationtype: Journal Article
      21
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    Item type:Publication, Access status: without files ,
    Influence of different carbon nanotubes on the mechanical properties of epoxy matrix composites - A comparative study
    (2005-12)
    Gojny, Florian H.
    ;
    Wichmann, Malte Hendrik Georg
    ;
    Fiedler, Bodo
    ;
    Schulte, Karl
    Carbon nanotubes (CNTs) in general are considered to be highly potential fillers to improve the material properties of polymers. However, questions concerning the appropriate type of CNTs, e.g., single-wall CNTs (SWCNT), double-wall CNTs (DWCNT) or multi-wall CNTs (MWCNT), and the relevance of a surface functionalisation are still to be answered. This first part of the study focuses on the evaluation of the different types of nanofillers applied, their influence on the mechanical properties of epoxy-based nanocomposites and the relevance of surface functionalisation. The nanocomposites produced exhibited an enhanced strength and stiffness and even more important, a significant increase in fracture toughness (43% at 0.5 wt% amino-functionalised DWCNT). The influence of filler content, the varying dispersibility, the aspect ratio, the specific surface area and an amino-functionalisation on the composite properties are discussed and correlated to the identified micro-mechanical mechanisms.
    Publicationtype: Journal Article
      24