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    Lignin as a High-Value Bioaditive in 3D-DLP Printable Acrylic Resins and Polyaniline Conductive Composite

    Year: 2022

    Journal: Polymers, Volume 14, OCT

    Authors: Arias-Ferreiro, Goretti; Lasagabaster-Latorre, Aurora; Ares-Pernas, Ana; Ligero, Pablo; Maria Garcia-Garabal, Sandra; Sonia Dopico-Garcia, Maria; Abad, Maria-Jose

    Organizations: Xunta de Galicia; European Union [ED481A-2019/001]; Ministerio de Ciencia e Innovacion/FEDER [PID2020116976RB-I00]; Xunta de Galicia-FEDER [ED431C 2019/17, ED431B 2019/44]

    Keywords: lignin; DLP; polyaniline; filler dispersibility; additive manufacturing; acrylic resin

    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 similar to 5%), and higher wettability (contact angles decrease similar to 19.5%). Finally, 1 wt.% lignin was added into 3D printed acrylic resins containing 5 wt.% p-toluensulfonic doped polyaniline (pTSA-PANI). The lignin/p TSA-PANI/acrylic composite showed a clear improvement in the dispersion of the conductive filler, reducing the average surface roughness (R-a) 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.
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