Lignin as a high-value bioaditive in 3D-DLP printable acrylic resins and polyaniline conductive composite

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http://hdl.handle.net/2183/32274
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)
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Lignin as a high-value bioaditive in 3D-DLP printable acrylic resins and polyaniline conductive compositeAuthor(s)
Date
2022-10-04Citation
Arias-Ferreiro, G.; Lasagabáster-Latorre, A.; Ares-Pernas, A.; Ligero, P.; García-Garabal, S.M.; Dopico-García, M.S.; Abad, M.-J. Lignin as a High-Value Bioaditive in 3D-DLP Printable Acrylic Resins and Polyaniline Conductive Composite. Polymers 2022, 14, 4164. https://doi.org/10.3390/polym14194164
Abstract
[Abstract]: With increasing environmental awareness, lignin will play a key role in the transition from the traditional materials industry towards sustainability and Industry 4.0, boosting the development of functional eco-friendly composites for future electronic devices. In this work, a detailed study of the effect of unmodified lignin on 3D printed light-curable acrylic composites was performed up to 4 wt.%. Lignin ratios below 3 wt.% could be easily and reproducibly printed on a digital light processing (DLP) printer, maintaining the flexibility and thermal stability of the pristine resin. These low lignin contents lead to 3D printed composites with smoother surfaces, improved hardness (Shore A increase ~5%), and higher wettability (contact angles decrease ~19.5%). Finally, 1 wt.% lignin was added into 3D printed acrylic resins containing 5 wt.% p-toluensulfonic doped polyaniline (pTSA-PANI). The lignin/pTSA-PANI/acrylic composite showed a clear improvement in the dispersion of the conductive filler, reducing the average surface roughness (Ra) by 61% and increasing the electrical conductivity by an order of magnitude (up to 10-6 S cm-1) compared to lignin free PANI composites. Thus, incorporating organosolv lignin from wood industry wastes as raw material into 3D printed photocurable resins represents a simple, low-cost potential application for the design of novel high-valued, bio-based products.
Keywords
Lignin
DLP
Polyaniline
Filler dispersibility
Additive manufacturing
Acrylic resin
DLP
Polyaniline
Filler dispersibility
Additive manufacturing
Acrylic resin
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Rights
Attribution 4.0 International (CC BY 4.0)
ISSN
2073-4360