Next Article in Journal
Magnesium Phosphate Cement as Mineral Bone Adhesive
Next Article in Special Issue
3D-Printed Sievenpiper Metasurface Using Conductive Filaments
Previous Article in Journal
FE Analysis of Critical Testing Parameters in Kolsky Bar Experiments for Elastomers at High Strain Rate
Article

Fabrication of High Permittivity Resin Composite for Vat Photopolymerization 3D Printing: Morphology, Thermal, Dynamic Mechanical and Dielectric Properties

Additive Manufacturing Group, WMG, The University of Warwick, Coventry CV4 7AL, UK
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(23), 3818; https://doi.org/10.3390/ma12233818
Received: 8 October 2019 / Revised: 15 November 2019 / Accepted: 18 November 2019 / Published: 20 November 2019
The formulation of a high dielectric permittivity ceramic/polymer composite feedstock for daylight vat photopolymerization 3D printing (3DP) is demonstrated, targeting 3DP of devices for microwave and THz applications. The precursor is composed of a commercial visible light photo-reactive polymer (VIS-curable photopolymer) and dispersed titanium dioxide (TiO2, TO) ceramic nano-powder or calcium copper titanate (CCT) micro-powder. To provide consistent 3DP processing from the formulated feedstocks, the carefully chosen dispersant performed the double function of adjusting the overall viscosity of the photopolymer and provided good matrix-to-filler bonding. Depending on the ceramic powder content, the optimal viscosities for reproducible 3DP with resolution better than 100 µm were η(TO) = 1.20 ± 0.02 Pa.s and η(CCT) = 0.72 ± 0.05 Pa.s for 20% w/v TO/resin and 20% w/v CCT/resin composites at 0.1 s−1 respectively, thus showing a significant dependence of the “printability” on the dispersed particle sizes. The complex dielectric properties of the as-3D printed samples from pure commercial photopolymer and the bespoke ceramic/photopolymer mixes are investigated at 2.5 GHz, 5 GHz, and in the 12–18 GHz frequency range. The results show that the addition of 20% w/v of TO and CCT ceramic powder to the initial photopolymer increased the real part of the permittivity of the 3DP composites from ε’ = 2.7 ± 0.02 to ε’(TO) = 3.88 ± 0.02 and ε’(CCT) = 3.5 ± 0.02 respectively. The present work can be used as a guideline for high-resolution 3DP of structures possessing high-ε. View Full-Text
Keywords: additive manufacturing; daylight polymer printing; nanocomposites; photopolymer; dielectric properties; dynamic mechanical properties additive manufacturing; daylight polymer printing; nanocomposites; photopolymer; dielectric properties; dynamic mechanical properties
Show Figures

Figure 1

MDPI and ACS Style

Malas, A.; Isakov, D.; Couling, K.; Gibbons, G.J. Fabrication of High Permittivity Resin Composite for Vat Photopolymerization 3D Printing: Morphology, Thermal, Dynamic Mechanical and Dielectric Properties. Materials 2019, 12, 3818. https://doi.org/10.3390/ma12233818

AMA Style

Malas A, Isakov D, Couling K, Gibbons GJ. Fabrication of High Permittivity Resin Composite for Vat Photopolymerization 3D Printing: Morphology, Thermal, Dynamic Mechanical and Dielectric Properties. Materials. 2019; 12(23):3818. https://doi.org/10.3390/ma12233818

Chicago/Turabian Style

Malas, Asish, Dmitry Isakov, Kevin Couling, and Gregory J. Gibbons 2019. "Fabrication of High Permittivity Resin Composite for Vat Photopolymerization 3D Printing: Morphology, Thermal, Dynamic Mechanical and Dielectric Properties" Materials 12, no. 23: 3818. https://doi.org/10.3390/ma12233818

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop