Semi?Crystalline Polyetherimide Microparticles via Liquid?Liquid Phase Separation and Precipitation

A novel approach for production of polyetherimide (PEI) microparticles by liquid–liquid phase separation (LLPS) and precipitation is demonstrated the effect used solvents acetophenone dimethyl phthalate on obtained powders outlined. Interestingly, method allows one to produce semi-crystalline particles, while PEI known be hard crystallize typically in amorphous form. To get a deeper understanding behavior polymer-solvent systems, cloud point curves dependence system composition are determined. The particles thoroughly characterized. They highly semi-crystalline, as proven DSC X-ray diffraction an ideal feedstock powder bed fusion polymers with laser beam (PBF-LB/P). Polymorphism and, thus, thermal characteristics like melting point, can tuned solvent. After heating precipitated samples above their temperature subsequent cooling fully polymer obtained, which assessed advantageous respect mechanical properties (toughness) PBF-LB/P-produced component from this feedstock.