Matching Low Viscosity with Enhanced Conductivity in Vat Photopolymerization 3D Printing: Disparity in the Electric and Rheological Percolation Thresholds of Carbon-Based Nanofillers Is Controlled by the Matrix Type and Filler Dispersion
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Date
2023-11-25
Authors
Sevriugina, Veronika
Pavliňák, David
Ondreáš, František
Jašek, Ondřej
Štaffová, Martina
Lepcio, Petr
0000-0001-9669-7946Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
AMER CHEMICAL SOC
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Abstract
This study investigated the impact of carbonaceous fillers (carbon black, multiwalled carbon nanotubes, graphene, and highly defective graphene) on aromatic and nonaromatic photopolymer resins' properties, such as viscosity, long-term stability, complex permittivity, curing efficiency, final conversion, storage modulus, heat deflection and glass transition temperatures, network density, and DC resistivity. The presented results also highlight challenges that must be addressed in designing and processing carbonaceous filler-based 3D-printed photopolymer resins. The improved dielectric and electrical properties were closely tied to the dispersion quality and filler-matrix affinity. It favored the enhanced dispersion of anisotropic fillers (nanotubes) in a compatible matrix above their percolation threshold. On the other hand, the dispersed filler worsens printability due to the elevated viscosity and deteriorated penetration depth. Nonetheless, electrical and rheological percolation was found at different filler concentrations. This window of despaired percolation combines highly enhanced conductivity with only mildly increased viscosity and good printability.
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Citation
ACS OMEGA. 2023, vol. 8, issue 48, p. 45566-45577.
https://pubs.acs.org/doi/10.1021/acsomega.3c05683
https://pubs.acs.org/doi/10.1021/acsomega.3c05683
Document type
Peer-reviewed
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Published version
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Language of document
en