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Morphology, rheological, and electrical properties of flexible epoxy/carbon composites cured by UV technique

Published online by Cambridge University Press:  22 June 2020

Pollawat Charoeythornkhajhornchai  and
Chavakorn Samthong
Pollawat Charoeythornkhajhornchai*
Affiliation:
Division of Materials Engineering, Faculty of Engineering, Burapha University, Muang, Chonburi20131, Thailand
Chavakorn Samthong
Affiliation:
Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Pathumwan, Bangkok10330, Thailand
*
a)Address all correspondence to this author. e-mail: pollawat.ch@eng.buu.ac.th
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Abstract

The aim of this research was to develop the UV-cured epoxy/carbon composites. The rheological properties of the uncured neat epoxy and epoxy composite with graphite, graphene, and multi-walled carbon nanotube (MWCNT) were evaluated to observe the macroscopic flow behavior and the microstructure by shear force. The results showed that epoxy/carbon composites at high filler content exhibited shear-thinning behavior with a high yield stress value and epoxy/MWCNT at 30 phr showed this characteristic obviously. The fractured surface and particle dispersion in the epoxy matrix were evaluated by scanning electron microscopy and transmission electron microscopy, respectively. Epoxy/carbon composites at high filler content displayed rough fracture surface with particle agglomeration, thus the electrical conductivity increased. The result showed that the epoxy/MWCNT composites had high potential to use as a conductive adhesive with a 3D printing process due to high electrical conductivity with high viscosity that could be formed easily during processing.

Keywords

electrical propertiesmorphologycomposite
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 14 , 28 July 2020 , pp. 1874 - 1887
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Copyright
Copyright © Materials Research Society 2020

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