Methods include dissolving a polyoxymethylene (POM) homopolymer or copolymer in one or more solvents at an elevated temperature (e.g., up to a boiling point+10° C. (T.sub.BP+10C) of the one or more solvents) to form a polymer mixture, wherein a difference in total Hansen solubility parameters (Δδ.sub.t) for the POM homopolymer or copolymer and the one or more solvents is 6 or less; cooling the polymer mixture to form a POM particle composition; and isolating the POM particle composition. Said method may be performed at ambient pressures.

Methods include dissolving a polyoxymethylene (POM) homopolymer or copolymer in one or more solvents at an elevated temperature (e.g., up to a boiling point+10° C. (T.sub.BP+10C) of the one or more solvents) to form a polymer mixture, wherein a difference in total Hansen solubility parameters (Δδ.sub.t) for the POM homopolymer or copolymer and the one or more solvents is 6 or less; cooling the polymer mixture to form a POM particle composition; and isolating the POM particle composition. Said method may be performed at ambient pressures.

Disclosed is a method of preparing a polycaprolactone powder possessing properties making it well-suited to powder bed fusion 3D printing processes. The polycaprolactone powder disclosed herein has an enthalpy of fusion between 80 J/g and 140 J/g. The polycaprolactone powder described herein has a D.sub.90 between 20 microns and 150 microns. The polycaprolactone powder described herein contains a detectable amount of a biocompatible solvent, a bioresorbable solvent, and/or ethyl lactate.

A method for producing polyimide microparticles may comprise: combining a diamine and a dianhydride in a first dry, high boiling point solvent; reacting the diamine and the dianhydride to produce a mixture comprising poly(amic acid) (PAA) and the first dry, high boiling point solvent; emulsifying the mixture in a matrix fluid that is immiscible with the first dry, high boiling point solvent using an emulsion stabilizer to form a precursor emulsion that is an oil-in-oil emulsion; and heating the precursor emulsion during and/or after formation to a temperature sufficient to polymerize the PAA to form the polyimide microparticles.

A method for producing polyimide microparticles may comprise: combining a diamine and a dianhydride in a first dry, high boiling point solvent; reacting the diamine and the dianhydride to produce a mixture comprising poly(amic acid) (PAA) and the first dry, high boiling point solvent; emulsifying the mixture in a matrix fluid that is immiscible with the first dry, high boiling point solvent using an emulsion stabilizer to form a precursor emulsion that is an oil-in-oil emulsion; and heating the precursor emulsion during and/or after formation to a temperature sufficient to polymerize the PAA to form the polyimide microparticles.

A semicrystalline polyketone powder useful for additive manufacturing may be made by dissolving a polyketone having differential scanning calorimetry (DSC) monomodal melt peak, at a temperature above 50° C. to below the melt temperature of the polyketone, precipitating the dissolved polyketone by cooling, addition of a nonsolvent or combination thereof. The method may be used to form polyketones having a DSC melt peak with an enthalpy greater than the starting polyketone.

A part material for printing three-dimensional parts with a selective deposition-based additive manufacturing system has a composition having a thermoplastic elastomer (TPE) polymer and a surface modifier. The TPE polymer is polyether block amide (PEBA). The part material is provided in a powder form having a D90/D50 particle size distribution and a D50/D10 particle size distribution each ranging from about 1.00 to about 2.0, wherein the part material is configured for use in the selective deposition-based additive manufacturing system having a layer transfusion assembly for printing the three-dimensional parts in a layer-by-layer manner.

A part material for printing three-dimensional parts with a selective deposition-based additive manufacturing system has a composition having a thermoplastic elastomer (TPE) polymer and a surface modifier. The TPE polymer is polyether block amide (PEBA). The part material is provided in a powder form having a D90/D50 particle size distribution and a D50/D10 particle size distribution each ranging from about 1.00 to about 2.0, wherein the part material is configured for use in the selective deposition-based additive manufacturing system having a layer transfusion assembly for printing the three-dimensional parts in a layer-by-layer manner.

Disclosed herein is a method for preparing an antibacterial bio-filler for plastics and an antibacterial bio-filler for plastics, prepared thereby. More specifically a method for preparing an oleophilic antibacterial bio-filler for plastics from hydrophilic lignocellulosic biomass and an antibacterial bio-filler for plastics prepared thereby are provided.

Disclosed herein is a method for preparing an antibacterial bio-filler for plastics and an antibacterial bio-filler for plastics, prepared thereby. More specifically a method for preparing an oleophilic antibacterial bio-filler for plastics from hydrophilic lignocellulosic biomass and an antibacterial bio-filler for plastics prepared thereby are provided.