Volumetric composition of nanocomposites

Bo Madsen, Hans Lilholt, Juha Mannila, Rangika Thilan De Silva, Pooria Pasbakhsh

    Research output: Contribution to conferencePaper

    1 Citation (Scopus)

    Abstract

    Detailed characterisation of the properties of composite materials with nanoscale fibres is central for the further progress in optimization of their manufacturing and properties. In the present study, a methodology for the determination and analysis of the volumetric composition of nanocomposites is presented, using cellulose/epoxy and aluminosilicate/polylactate nanocomposites as case materials. The buoyancy method is used for the accurate measurements of materials density. The accuracy of the method is determined to be high, allowing the measured nanocomposite densities to be reported with 5 significant figures. The plotting of the measured nanocomposite density as a function of the nanofibre weight content is shown to be a first good approach of assessing the porosity content of the materials. The known gravimetric composition of the nanocomposites is converted into a volumetric composition. An analytical model, previously established for conventional fibre composites, is used for the analysis of the volumetric composition. For the aluminosilicate/polylactate nanocomposites, based on the established linear relationship between the porosity content and the fibre volume content, the fibre correlated porosity factor is determined to be 0.18. Geometrical considerations of the packing of parallel nanofibres in a square array are used to make the assumption that the maximum obtainable fibre volume content in the nanocomposites will not exceed 6 % due to the small fibre spacing that restricts full matrix impregnation. The predicted volumetric composition and density of the aluminosilicate/polylactate nanocomposites is in good agreement with the experimental data. It is demonstrated that the model provides a valuable tool for the prediction and analysis of the volumetric composition of composites with nanoscale fibres.

    Original languageEnglish
    Publication statusPublished - 2015
    EventInternational Conference on Composite Materials 2015 - Copenhagen, Denmark
    Duration: 19 Jul 201524 Jul 2015
    Conference number: 20th
    https://www.iccm20.org/
    http://www.iccm-central.org/Proceedings/ICCM20proceedings/ (Proceedings)

    Conference

    ConferenceInternational Conference on Composite Materials 2015
    Abbreviated titleICCM 2015
    CountryDenmark
    CityCopenhagen
    Period19/07/1524/07/15
    Internet address

    Keywords

    • Density
    • Fibre content
    • Fibre packing
    • Void content

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