Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/155773
Title: Non-isothermal crystallization behaviour of polyamide 12 analogous to multi-jet fusion additive manufacturing process
Authors: Teo, Benjamin How Wei
Chen, Kaijuan
Tran, Van Thai
Du, Hejun
Zeng, Jun
Zhou, Kun
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Teo, B. H. W., Chen, K., Tran, V. T., Du, H., Zeng, J. & Zhou, K. (2021). Non-isothermal crystallization behaviour of polyamide 12 analogous to multi-jet fusion additive manufacturing process. Polymer, 235, 124256-. https://dx.doi.org/10.1016/j.polymer.2021.124256
Project: I1801E0028
Journal: Polymer
Abstract: Warpage of printed parts, especially for multi-jet fusion (MJF) process, is believed to have strong correlation with crystallization shrinkage. Hence, this article investigates the shrinkage phenomenon of polyamide-12 (PA12) during crystallization process. Various cooling rates show that PA12 exhibits different crystallization behaviour, which affect the crystallinity, crystal phase and crystal shrinkage when performed in MJF. The investigation shows that crystallization shrinkage of PA12 coincides with the exothermic reaction of crystallization process. With cooling rate as slow as 0.2 °C/min, PA12 sample shrinks 1.64% during the crystallization process with crystallinity calculated at 24.9%. X-ray diffraction (XRD) suggests shrinkage are closely related to lamellar folding and growth of γ crystal phase within PA12 samples during crystallization. Spherulites are found to be smaller in diameter with faster cooling rate. These investigations provide detailed understanding of the crystallization behaviour of PA12 for MJF process.
URI: https://hdl.handle.net/10356/155773
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2021.124256
Rights: © 2021 Elsevier Ltd. All rights reserved. This paper was published in Polymer and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20231126
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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