Production of polyamide 11 microparticles for Additive Manufacturing by liquid-liquid phase separation and precipitation

Dechet M, Goblirsch A, Romeis S, Zhao M, Lanyi F, Kaschta J, Schubert DW, Drummer D, Peukert W, Schmidt J (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Chemical Engineering Science Elsevier

Book Volume: 197

Pages Range: 11-25

DOI: 10.1016/j.ces.2018.11.051

Abstract

Within this contribution liquid-liquid phase separation (LLPS) and precipitation from ethanol was studied as an approach to produce polyamide 11 (PA11) powders for selective laser sintering (SLS). To this end, the cloud point and solution temperature curve of the PAll-ethanol system was determined experimentally via turbidity measurements. The proper range of system composition and temperature for particle formation was deduced. The dependence of particle characteristics on process parameters (polymer concentration, stirring conditions and temperature regime) during LLPS and precipitation was assessed and the products were characterized with respect to their size and morphology. Furthermore, structural, rheological and thermal characteristics were analyzed and correlated with process parameters. Molecular weight distributions were determined. After removal of fines and dry coating with hydrophobic fumed silica, an optimized PA11 powder with mean particle size of 91 mu m showing good flowability for SLS was obtained. SLS processability of this optimized PA11 powder was demonstrated by building multilayered test specimens in a laser sintering machine. With this contribution, we present a comprehensive workflow for the process development, product characterization and product application of a SLS powder manufactured via precipitation. (C) 2018 Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Maximilian Dechet Lehrstuhl für Partikelsynthese (LFG) Anja Goblirsch Lehrstuhl für Partikelsynthese (LFG) Stefan Romeis Lehrstuhl für Partikelsynthese (LFG) Meng Zhao Sonderforschungsbereich 814/3 Additive Fertigung Franz Lanyi Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP) Joachim Kaschta Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP) Dirk Schubert Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe) (LSP) Dietmar Drummer Lehrstuhl für Kunststofftechnik (LKT) Wolfgang Peukert Lehrstuhl für Partikelsynthese (LFG) Jochen Schmidt Lehrstuhl für Partikelsynthese (LFG)

Related research project(s)

Process-adapted material characterization for laser beam melting (A3) (SFB 814 (A3)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023 Production of functional polymer particles via liquid-based top-down processes (A1) (SFB 814 (A1)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023

How to cite

APA:

Dechet, M., Goblirsch, A., Romeis, S., Zhao, M., Lanyi, F., Kaschta, J.,... Schmidt, J. (2019). Production of polyamide 11 microparticles for Additive Manufacturing by liquid-liquid phase separation and precipitation. Chemical Engineering Science, 197, 11-25. https://doi.org/10.1016/j.ces.2018.11.051

MLA:

Dechet, Maximilian, et al. "Production of polyamide 11 microparticles for Additive Manufacturing by liquid-liquid phase separation and precipitation." Chemical Engineering Science 197 (2019): 11-25.

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