pps proceeding - Abstract Preview
pps proceeding
Symposium: S11 - Additive Manufacturing
Poster Presentation
 
 

A safe green ink for solvent-cast 3D printing

Latko-Durałek Paulina (1)*, Santonja Soto Ferran (1), Therriault Daniel (1)

(1) Polytechnique Montréal - Quebec - Canada

Because of the excessive consumption of harmful solvents pushes many industrial sectors to search for the greener alternatives. However, finding less dangerous substitutes is a real challenge for polymers which are resistant to many solvents or are only soluble in acids or chlorinated solvents. Solvent-cast 3D printing is one of the new-emerging additive manufacturing methods in which a polymer is dissolved in an appropriate solvent having high evaporation rate. Afterwards the solution is printed under applied pressure through the micro nozzle with the simultaneous evaporation of the solvent. The focus of this work is to find an alternative greener solvent for biodegradable poly(lactic acid) to replace highly volatile dichloromethane which is often used in the solvent-cast 3D printing process. Among a few tested solvents, dimethyl carbonate was selected since it has low boiling point and shows low toxicity and fast biodegradability. The maximum concentration of the poly(lactic acid) dissolved in dimethyl carbonate was 18wt%, while the percentage of the polymer in the dichloromethane was 30wt%. Evaporation of the dimethyl carbonate from the formed filaments during printing is slower than for dichloromethane, but it is still in the range required to create 3D objects with complex shapes.