Single-Component Cellulose Acetate Sulfate Hydrogels for Direct Ink Writing 3D Printing
Year: 2024
Type: article
Abstract: Hydrogels, typically favored for 3D printing due to their viscoelasticity, are now trending towards eco-friendly alternatives amid growing environmental concerns. In this study, we crafted cellulose-based hydrogels, specifically employing cellulose acetate sulfate (CAS). By keeping the acetyl group substitution degree (DSacetyl = 1.8) and CAS molecular weight constant, we varied rheological properties by adjusting sulfate group substitution (DSsulfate = 0.4, 0.7, and 1.0) and CAS concentration (2-5 wt.%). Rheological characterizations, including shear-thinning, yield stress, and thixotropy, were performed to identify optimal conditions for formulating CAS hydrogel ink in direct ink writing for 3D printing under experimental conditions. Based on rheological findings, CAS hydrogels with DSsulfate 0.7 and concentration of 4 wt.% was used for 3D printing, with subsequent evaluation of printing parameters. Additionally, the effect of ionic crosslinking using Ca2+ ions on the structural integrity of 3D-printed structures was evaluated, demonstrating effective preservation through reinforced polymer networks. The shrinking and swelling behaviors of the 3D-printed structures were also significantly affected by this ionic crosslinking. Building on these findings, this work could extend the potential applications of CAS hydrogels in diverse fields.
Source: Biomacromolecules
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4401734149