Alignment of nano and micron diameter carbon fillers in epoxy via electric field

Anil R. Ravindran, Raj B. Ladani, Shuying Wu, Anthony J. Kinloch, Chun H. Wang, Adrian P. Mouritz

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

This paper presents an experimental investigation on the in-situ alignment of carbon fillers spanning dual length scales via the application of an external electric field to improve the electrical and mechanical properties of filled epoxy polymers. When subjecting the fillers to an applied alternating current electric field within the un-cured, liquid epoxy resin, it was found that the carbon nanofibers (CNFs) and micron diameter, short, carbon fibres (SCFs) would align along the field direction. These epoxy composites containing the nano and micron diameter scale fibrous fillers exposed to an applied electric field exhibited an increased mode I fracture toughness, GIc, and DC electrical conductivity along the direction of the field. In comparison to the epoxy composites containing the randomly oriented fillers, the alignment of the SCFs and CNFs, when used separately, resulted in an improvements in the GIc value of 30% and 27%, respectively. However, the multi-scale reinforced epoxy composites, containing the aligned fillers, exhibited a 16-fold increase in the the GIc compared to the unmodified epoxy and a 39% improvement over the composite containing the randomly oriented fillers. Several key toughening mechanisms through fractographic analysis were identified. The study reveals that aligning the carbon fillers ranging from the nano and the micron length scale offers a promising route in creating multi-scale reinforced composites with greatly enhanced properties.

Original languageEnglish
Title of host publicationProceedings of the ICCM21, Xi'an, August 20-25th 2017
PublisherInternational Committee on Composite Materials (ICCM)
Number of pages10
Publication statusPublished - 2017
Externally publishedYes
EventInternational Conference on Composite Materials (21st : 2017) - Xi'an, China
Duration: 20 Aug 201725 Aug 2017

Conference

ConferenceInternational Conference on Composite Materials (21st : 2017)
Abbreviated titleICCM21
CountryChina
CityXi'an
Period20/08/1725/08/17

Keywords

  • Carbon nanofibres
  • Short carbon fibre
  • Electric field
  • Fracture toughness
  • Alignment

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  • Cite this

    Ravindran, A. R., Ladani, R. B., Wu, S., Kinloch, A. J., Wang, C. H., & Mouritz, A. P. (2017). Alignment of nano and micron diameter carbon fillers in epoxy via electric field. In Proceedings of the ICCM21, Xi'an, August 20-25th 2017 International Committee on Composite Materials (ICCM).