Influence of carbon nanoparticle modification on the mechanical and electrical properties of epoxy in small volumes

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • Christian Leopold
  • Till Augustin
  • Thomas Schwebler
  • Jonas Lehmann
  • Wilfried V. Liebig
  • Bodo Fiedler

The influence of nanoparticle morphology and filler content on the mechanical and electrical properties of carbon nanoparticle modified epoxy is investigated regarding small volumes. Three types of particles, representing spherical, tubular and layered morphologies are used. A clear size effect of increasing true failure strength with decreasing volume is found for neat and carbon black modified epoxy. Carbon nanotube (CNT) modified epoxy exhibits high potential for strength increase, but dispersion and purity are critical. In few layer graphene modified epoxy, particles are larger than statistically distributed defects and initiate cracks, counteracting any size effect. Different toughness increasing mechanisms on the nano- and micro-scale depending on particle morphology are discussed based on scanning electron microscopy images. Electrical percolation thresholds in the small volume fibres are significantly higher compared to bulk volume, with CNT being found to be the most suitable morphology to form electrical conductive paths. Good correlation between electrical resistance change and stress strain behaviour under tensile loads is observed. The results show the possibility to detect internal damage in small volumes by measuring electrical resistance and therefore indicate to the high potential for using CNT modified polymers in fibre reinforced plastics as a multifunctional, self-monitoring material with improved mechanical properties.

Original languageEnglish
JournalJournal of Colloid and Interface Science
Volume506
Pages (from-to)620-632
Number of pages13
ISSN0021-9797
DOIs
Publication statusPublished - 15.11.2017
Externally publishedYes

Bibliographical note

Funding Information:
This work was carried out with funding from the German Research Foundation (DFG) within the project number FI 688/5-1. This financial support is gratefully acknowledged. The second author kindly acknowledges the financial support from Landesforschungsförderung Hamburg (project: Health-Monitoring von Faserverbundstrukturen mit Hilfe von Sensorarrays, Grant No. LFF-FV 05). We thank OCSiAl, Russia for the support of the SWCNTs.

Publisher Copyright:
© 2017

    Research areas

  • Damage mechanisms, Fractography, Percolation behaviour, Sensing, Structural health monitoring, True failure strength
  • Engineering

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