Printability of Poly(lactic acid) Ink by Embedded 3D Printing via Immersion Precipitation

• DOI: 10.1021/acsami.3c00149
• Publication Date: 2023-04-20T12:45:36Z
• Authors: Rahul Karyappa; Hongfei Liu; Qiang Zhu; Michinao Hashimoto
• Keywords: Immersion

Immersion precipitation three-dimensional printing (ip3DP) and freeform polymer (FPP) are unique versatile methods of 3D to fabricate structures based on nonsolvent-induced phase separation via direct ink writing (DIW). involves complex dynamics among solvents, nonsolvents, dissolved polymers, the printability models in these requires further understanding. To this end, we characterized two using polylactide (PLA) dichloromethane (7.5-30% w/w) as model inks. We analyzed rheological properties solutions effect parameters solvent-nonsolvent diffusion achieve printability. The PLA inks exhibited shear-thinning properties, their viscosities varied over three orders magnitude (10-1∼102 Pa·s). A processing map was presented understand ideal ranges concentration nozzle diameter ensure printability, fabrication fabricated with adequate applied pressure speed. also highlighted advantages embedded solvent-cast solvent evaporation. Lastly, demonstrated that porosity interface inner structure printed objects readily tailored by porogen added ink. here offer new perspectives micro-to-centimeter thermoplastics nanometer-scale pores provide guidelines for successful immersion precipitation.