Details

Autor(en) / Beteiligte

• Gómez Bonilla, Juan S.
• Düsenberg, Björn
• Lanyi, Franz
• Schmuki, Patrik
• Schubert, Dirk W.
• Schmidt, Jochen
• Peukert, Wolfgang
• Bück, Andreas

Titel

Improvement of polymer properties for powder bed fusion by combining in situ PECVD nanoparticle synthesis and dry coating

Ist Teil von

• Plasma processes and polymers, 2021-06, Vol.18 (6), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2021

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Polypropylene (PP) powders are coated with silica nanoparticles in a fluidized bed to improve the flow behavior of the powders and the processability in powder bed fusion. The nanoparticles are produced in situ via dusty plasma‐enhanced chemical vapor deposition (PECVD) in an atmospheric‐pressure Ar/O2 plasma jet fixed at the distributor plate of the fluidized bed. Hexamethyldisiloxane is used as a precursor of the nanoparticles. The influence of the oxygen concentration in the plasma gas and the number of treatment cycles on the chemical composition of the nanoparticles, the amount of nanoparticles deposited, and the flow properties of the coated PP powders is investigated. The chemical composition of the formed silica particles is determined by X‐ray photon spectroscopy and infrared spectroscopy. The results reveal that the composition of the nanoparticles is SiOxCy, that is, the portion of organic residues introduced by the precursor can be controlled by changing the oxygen concentration in the plasma gas. The mass of nanoparticles deposited on the polymer powder's surface, as determined by inductively coupled optical emission spectroscopy, shows a linear dependence of the number of cycles and the oxygen concentration in the plasma gas. A considerable improvement of the flow behavior of the PP powders is observed after PECVD treatment. Graphical A single‐step atmospheric‐plasma process of in situ production of nanoparticles and dry coating of powders is presented. The process allows the control of the chemical composition of nanoparticles by varying the composition of the plasma gas. Improved flow properties of polypropylene (PP) are obtained with a negligible influence on thermal properties of PP after the plasma‐enhanced chemical vapor deposition treatment.