Special Issue "Specialty Polymers for Additive Manufacturing"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editor

Dr. Jochen Schmidt
Website
Guest Editor
Institute of Particle Technology, University of Erlangen-Nuremberg, Cauerstraße 4, D-91058 Erlangen, Germany
Interests: additive manufacturing (AM); particle technology; comminution; emulsification; bulk solids

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) summarizes different technologies that allow for the manufacture of functional parts without shaping tools from viscous, powdery or layered material systems. In recent years, a vast rising interest in AM is notable, as these manufacturing methods allow for the production of complex and individualized parts with novel functionalities. With respect to the AM of polymers, powder bed fusion (PBF) in particular, often referred to as laser sintering (LS) or selective laser sintering (SLS), as well as fused deposition modeling (FDM) and stereo lithography (SLA) are promising. A current drawback limiting the use of AM-produced parts is the limited choice of (commercially) available polymer materials: For example, in powder bed fusion of polymers, more than 90 percent of the market share by now is made up of polyamide powders, mostly polyamide 12.

This Special Issue calls for papers that report on the development (production and functionalization) and characterization of novel specialty (‘non-standard’) polymer materials for the aforementioned AM processes (and variants), such as novel resin systems, high-temperature thermoplasts, biopolymers, polymer blends or filled polymers. Of course, contributions that also report on the AM processability of these novel polymer materials, part characterization, or the application of the produced parts are highly welcome.

Dr. Jochen Schmidt
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • development, characterization and processing of novel materials for powder bed fusion (PBF) of polymers
  • laser sintering (LS)
  • selective laser sintering (SLS)
  • fused deposition modeling (FDM)
  • stereo lithography (SLA)

Published Papers (1 paper)

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Research

Open AccessArticle
Development of Polyoxymethylene Particles via the Solution-Dissolution Process and Application to the Powder Bed Fusion of Polymers
Materials 2020, 13(7), 1535; https://doi.org/10.3390/ma13071535 - 27 Mar 2020
Abstract
In this study, the development of a polyoxymethylene (POM) feedstock material for the powder bed fusion (PBF) of polymers is outlined. POM particles are obtained via liquid-liquid phase separation (LLPS) and precipitation, also known as the solution-dissolution process. In order to identify suitable [...] Read more.
In this study, the development of a polyoxymethylene (POM) feedstock material for the powder bed fusion (PBF) of polymers is outlined. POM particles are obtained via liquid-liquid phase separation (LLPS) and precipitation, also known as the solution-dissolution process. In order to identify suitable POM solvent systems for LLPS and precipitation, in the first step, a solvent screening based on solubility parameters was performed, and acetophenone and triacetin were identified as the most promising suitable moderate solvents for POM. Cloud point curves were measured for both solvents to derive suitable temperature profiles and polymer concentrations for the solution-dissolution process. In the next step, important process parameters, namely POM concentration and stirring conditions, were studied to elucidate their effect on the product’s properties. The product particles obtained from both aforementioned solvents were characterized with regard to their morphology and size distribution, as well as their thermal properties (cf. the PBF processing window) and compared to a cryo-milled POM PBF feedstock. Both solvents allowed for precipitation of POM particles of an appropriate size distribution for PBF for polymer concentrations of at least up to 20 wt.%. Finally, a larger powder batch for application in the PBF process was produced by precipitation from the preferred solvent acetophenone. This POM powder was further analyzed concerning its flowability, Hausner ratio, and mass-specific surface area. Finally, test specimens, namely a complex gyroid body and a detailed ornament, were successfully manufactured from this feedstock powder showing appropriate bulk solid and thermal properties to demonstrate PBF processability. In summary, a processable and suitable POM PBF feedstock could be developed based on the non-mechanical solution dissolution process, which, to the authors’ best knowledge, has not been reported in previous studies. Full article
(This article belongs to the Special Issue Specialty Polymers for Additive Manufacturing)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Laser Powder Bed Fusion of Polymer Powders: Research trends within the last decade

Ihsan Murat Kusoglu1, Bilal Gökce1, Stephan Barcikowski1
(1) Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Germany
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