A novel, precipitated polybutylene terephthalate feedstock material for powder bed fusion of polymers (PBF): Material development and initial PBF processability

Dechet M, Gomez Bonilla JS, Grünewald M, Popp K, Rudloff J, Lang M, Schmidt J (2021)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2021

Journal

Materials & Design Elsevier

Book Volume: 197

Article Number: 109265

DOI: 10.1016/j.matdes.2020.109265

Abstract

The development of a novel polybutylene terephthalate (PBT) feedstock material for powder bed fusion of polymers with laser beam (PBF-LB/P) by means of liquid-liquid phase separation (LLPS) and precipitation is outlined. Appropriate solvents for precipitation have been identified by a screening approach based on solubility parameters. Feasible system compositions, and solution and cloud point temperatures were determined. For the most promising solvent cyclopentanone, a parameter study on the influence of stirring conditions during precipitation was performed. The obtained products were characterized with respect to their particle size distribution, particle shape, phase morphology, thermal properties and melt viscosity. Under optimized process conditions, PBT particles of high degree of crystallinity with narrow size distribution and a mean diameter of 36 μm were obtained; flowability was improved by dry coating. The initial PBF-LB/P processability was assessed by building single layers in a parameter study using a Formiga P110 machine. Dense single layers were obtained at laser power P_L = 11.5 W, scanning speed v_S = 4000 mm/s, hatch distance h_S = 0.24 mm and layer thickness d_S = 0.1 mm. Best to the authors' knowledge, this is the first study in the open literature reporting on a PBT feedstock material obtained by liquid-liquid phase separation and crystallization.

Authors with CRIS profile

Maximilian Dechet Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Juan Sebastian Gomez Bonilla Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Jochen Schmidt Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Related research project(s)

Herstellung von Partikeln für das selektive Lasersintern über Flüssig-Flüssig-Phasenseparation und Fällung (SPP2122) July 1, 2018 - June 30, 2021

Involved external institutions

FSKZ e. V. Fördergemeinschaft für das Süddeutsche Kunststoff-Zentrum e.V.

Germany (DE)

How to cite

APA:

Dechet, M., Gomez Bonilla, J.S., Grünewald, M., Popp, K., Rudloff, J., Lang, M., & Schmidt, J. (2021). A novel, precipitated polybutylene terephthalate feedstock material for powder bed fusion of polymers (PBF): Material development and initial PBF processability. Materials & Design, 197. https://dx.doi.org/10.1016/j.matdes.2020.109265

MLA:

Dechet, Maximilian, et al. "A novel, precipitated polybutylene terephthalate feedstock material for powder bed fusion of polymers (PBF): Material development and initial PBF processability." Materials & Design 197 (2021).

BibTeX: Download