Influence of carbon nanoparticle modification on the mechanical and electrical properties of epoxy in small volumes
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Influence of carbon nanoparticle modification on the mechanical and electrical properties of epoxy in small volumes. / Leopold, Christian; Augustin, Till; Schwebler, Thomas et al.
In: Journal of Colloid and Interface Science, Vol. 506, 15.11.2017, p. 620-632.Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Influence of carbon nanoparticle modification on the mechanical and electrical properties of epoxy in small volumes
AU - Leopold, Christian
AU - Augustin, Till
AU - Schwebler, Thomas
AU - Lehmann, Jonas
AU - Liebig, Wilfried V.
AU - Fiedler, Bodo
N1 - 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
PY - 2017/11/15
Y1 - 2017/11/15
N2 - 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.
AB - 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.
KW - Damage mechanisms
KW - Fractography
KW - Percolation behaviour
KW - Sensing
KW - Structural health monitoring
KW - True failure strength
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85026393969&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2017.07.085
DO - 10.1016/j.jcis.2017.07.085
M3 - Journal articles
C2 - 28763766
AN - SCOPUS:85026393969
VL - 506
SP - 620
EP - 632
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
ER -