Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification

Surface modification of reinforcement fibers is a potent strategy for enhancing the mechanical performance of fiber-reinfored composites. However, the strategy has rarely been applied to powder bed fusion because of the limited modification effectiveness. Here, a new surface modification method for...

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Main Authors: Chen, Jiayao, Zhao, Lihua, Zhou, Kun
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/162048
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1620482023-11-01T06:30:39Z Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification Chen, Jiayao Zhao, Lihua Zhou, Kun School of Mechanical and Aerospace Engineering HP-NTU Digital Manufacturing Corporate Lab Engineering::Materials Multi Jet Fusion Powder Bed Fusion Surface modification of reinforcement fibers is a potent strategy for enhancing the mechanical performance of fiber-reinfored composites. However, the strategy has rarely been applied to powder bed fusion because of the limited modification effectiveness. Here, a new surface modification method for aramid fibers (AFs) using amino-terminated hyperbranched polyamide (HBP) was proposed to improve the mechanical performance of the AF-reinforced polyamide 12 (PA12) composites printed by Multi Jet Fusion (MJF). The effect of the surface modification on the AFs was systematically examined by studying their surface morphology, chemical composition, and interfacial shear strength. The modified fibers were applied to fabricating PA12-based composite powders, which were then printed with an MJF printing testbed to reveal the effects of the fiber fraction, build orientation, and surface modification on their mechanical properties. The results showed that the surface modification of the AFs induced higher surface roughness by HBP coating and realized surface functionalization by amino groups. With the enhanced interfacial properties, the optimized AF-HBP/PA12 composite showed substantial improvement in its ultimate tensile strength and Young's modulus by 55% (73.4 MPa) and 110% (4.2 GPa), respectively, compared with the neat PA12 part. This simple and effective surface modification method can be further applied to other manufacturing technologies. National Research Foundation (NRF) This study is supported under the RIE2020 Industry Alignment Fund – Industry Collaboration Projects (IAF-ICP) Funding Initiative, Singapore, as well as cash and in-kind contribution from the industry partner, HP Inc. 2022-10-03T02:22:01Z 2022-10-03T02:22:01Z 2022 Journal Article Chen, J., Zhao, L. & Zhou, K. (2022). Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification. Additive Manufacturing, 51, 102576-. https://dx.doi.org/10.1016/j.addma.2021.102576 2214-7810 https://hdl.handle.net/10356/162048 10.1016/j.addma.2021.102576 2-s2.0-85123929675 51 102576 en Additive Manufacturing © 2021 Elsevier B.V. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
Multi Jet Fusion
Powder Bed Fusion
spellingShingle Engineering::Materials
Multi Jet Fusion
Powder Bed Fusion
Chen, Jiayao
Zhao, Lihua
Zhou, Kun
Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
description Surface modification of reinforcement fibers is a potent strategy for enhancing the mechanical performance of fiber-reinfored composites. However, the strategy has rarely been applied to powder bed fusion because of the limited modification effectiveness. Here, a new surface modification method for aramid fibers (AFs) using amino-terminated hyperbranched polyamide (HBP) was proposed to improve the mechanical performance of the AF-reinforced polyamide 12 (PA12) composites printed by Multi Jet Fusion (MJF). The effect of the surface modification on the AFs was systematically examined by studying their surface morphology, chemical composition, and interfacial shear strength. The modified fibers were applied to fabricating PA12-based composite powders, which were then printed with an MJF printing testbed to reveal the effects of the fiber fraction, build orientation, and surface modification on their mechanical properties. The results showed that the surface modification of the AFs induced higher surface roughness by HBP coating and realized surface functionalization by amino groups. With the enhanced interfacial properties, the optimized AF-HBP/PA12 composite showed substantial improvement in its ultimate tensile strength and Young's modulus by 55% (73.4 MPa) and 110% (4.2 GPa), respectively, compared with the neat PA12 part. This simple and effective surface modification method can be further applied to other manufacturing technologies.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Chen, Jiayao
Zhao, Lihua
Zhou, Kun
format Article
author Chen, Jiayao
Zhao, Lihua
Zhou, Kun
author_sort Chen, Jiayao
title Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
title_short Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
title_full Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
title_fullStr Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
title_full_unstemmed Improvement in the mechanical performance of Multi Jet Fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
title_sort improvement in the mechanical performance of multi jet fusion–printed aramid fiber/polyamide 12 composites by fiber surface modification
publishDate 2022
url https://hdl.handle.net/10356/162048
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