Aging behavior of thermoplastic elastomers in the laser sintering process

Ziegelmeier, Stefan; W�llecke, Frank; Tuck, Christopher J.; Goodridge, Ruth D.; Hague, Richard J.M.

Abstract

It is known that polymers used in laser sintering (LS) change their intrinsic properties due to processing conditions that are close to the crystalline melting temperature. This paper evaluates the aging behavior of a thermoplastic polyurethane powder, comparing with to a commercially available LS elastomeric material (Duraform®Flex, 3D Systems). To represent a realistic production environment, the materials were aged during 14 processing cycles in the LS process without refreshing with virgin material. Following each aging cycle, both the powder and the sintered parts were examined for chemical and physical aging effects. The results showed that the materials observed could be used without refreshing throughout the 14 aging stages, however, changes in the processing behavior as well as in the parts' mechanical properties were evident. These changes were due to the differing aging states of the LS-powder showing an increase in the particle size affecting the bulk materials packing density. Modifications in the rheological properties can be seen in a decrease of molecular weight likely to reduce the mechanical strength of tensile specimens.

Citation

Ziegelmeier, S., Wöllecke, F., Tuck, C. J., Goodridge, R. D., & Hague, R. J. (2014). Aging behavior of thermoplastic elastomers in the laser sintering process. Journal of Materials Research, 29(17), 1841-1851. https://doi.org/10.1557/jmr.2014.172

• Journal Article Type: Article
• Acceptance Date: Jun 16, 2014
• Online Publication Date: Aug 19, 2014
• Publication Date: Sep 14, 2014
• Deposit Date: Nov 29, 2018
• Journal: Journal of Materials Research
• Print ISSN: 0884-2914
• Electronic ISSN: 2044-5326
• Publisher: Cambridge University Press
• Peer Reviewed: Peer Reviewed
• Volume: 29
• Issue: 17
• Pages: 1841-1851
• DOI: https://doi.org/10.1557/jmr.2014.172
• Public URL: https://nottingham-repository.worktribe.com/output/1340857
• Publisher URL: https://www.cambridge.org/core/journals/journal-of-materials-research/article/aging-behavior-of-thermoplastic-elastomers-in-the-laser-sintering-process/16F8FB5BB08C98CDED8D2CD743A1A2BA