Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 10, Pages 13705-13710Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c03843
Keywords
3D printing; additive manufacturing; vat photopolymerization; nanocomposites; aramid nanofibers
Funding
- Department of Energy?s National Nuclear Security Agency
- Army Research Laboratory
- Consejo Nacional de Ciencia y Tecnolog?a
- [N000263171]
- [W911NF-18-2-0035]
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In this study, a methodology for incorporating aramid nanofibers (ANFs) into a 3D-printable photoresin as a dispersion was described. The solvent-exchange process was used to limit anisotropic shrinkage and cracking of the printed polymer. By incorporating 0.60 wt% ANFs, significant improvements in tensile strength, toughness, and Young's modulus were achieved.
Vat photopolymerization is a versatile 3D-printing method that produces parts using polymeric materials with uniform mechanical properties, high-quality surface finish, and high-resolution features. However, it is challenging to make composite materials with vat photopolymerization mainly because of the imperfect filler dispersion in the photoresin. Herein, we describe a methodology to incorporate aramid nanofibers (ANFs) into a 3D-printable photoresin as a dispersion, followed by a solvent-exchange process that limits anisotropic shrinkage and cracking of the printed polymer. By incorporating 0.60 wt % ANFs, both the tensile strength and toughness increased by 264% and 219%, respectively, while Young's modulus had a 406% increase compared to the control photoresin.
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