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Download fileDirect Ink Writing of Fully Bio-Based Liquid Crystalline Lignin/Hydroxypropyl Cellulose Aqueous Inks: Optimization of Formulations and Printing Parameters
journal contribution
posted on 2020-10-05, 15:34 authored by Lisa-Sophie Ebers, Marie-Pierre LaborieFollowing the recent demonstration of the potential to direct ink
write lyotropic blends of organosolv lignin (OSL) and hydroxypropyl
cellulose (HPC), this study aims to optimize the formulations and
direct ink writing parameters for fully bio-based lignin/HPC inks.
A prescreening identifies the theoretical window of printability for
different compositions for formulations based on OSL solutions of
45, 47.5, and 50% solid contents and OSL/HPC wt %/wt % ratios of 30/70,
40/60, and 50/50. Measurements of shear–viscosity and recovery
behavior evidence the shear-thinning contribution of HPC and the viscosity
recovery contribution of lignin. Shape fidelity, morphology, and mechanical
properties of printed monolayers from the prescreened formulations
reveal band texture morphology in printed parts and the best performance
for the inks with a solid content of 49% and an OSL/HPC ratio of 50/50
(Young’s modulus of 995 MPa, ultimate tensile strength of 18.5
MPa, and toughness of 2.8 MJ m–3). The ink composition
has a more significant impact on final properties than the printing
parameters, albeit a decreased printing speed of 5 mm s–1 and increased pressure of 3.5 bar contribute favorably to properties.
Finally, multiple layer objects were successfully printed for compositions
having solid contents of 49 and 50.5% and OSL/HPC ratios of 40/60
and 50/50.
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Keywords
band texture morphologyratioshape fidelityorganosolv ligninPrinting ParametersOSL solutionsprinting parameterscontentMJwtDirect Inkrecovery behavior evidencelyotropic blendslayer objectshydroxypropyl celluloseshear-thinning contributionprescreened formulations5 mm3.5 barviscosity recovery contributionprinting speedHPCink composition18.5 MPa995 MPa