Volume 43, Issue 7 2100874
Research Article

Improvement in Mechanical Properties of 3D-Printed PEEK Structure by Nonsolvent Vapor Annealing

Wenhui Chen

Wenhui Chen

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Xiaolong Zhang

Xiaolong Zhang

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Di Tan

Di Tan

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Peng Xu

Peng Xu

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Baisong Yang

Baisong Yang

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Kui Shi

Kui Shi

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Bo Zhu

Bo Zhu

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Quan Liu

Quan Liu

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Yifeng Lei

Yifeng Lei

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Sheng Liu

Sheng Liu

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

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Longjian Xue

Corresponding Author

Longjian Xue

School of Power and Mechanical Engineering and Institute of Technological Science, Wuhan University, 8 South Donghu Road, Wuhan, 430072 China

E-mail: [email protected]

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First published: 09 February 2022
Citations: 9

Abstract

The broad applications of 3D-printed poly-ether-ether-ketone (3D-PEEK) structures are largely hampered by their inadequate mechanical properties that can be improved by post treatments. At present, thermal annealing is generally used to improve the mechanical properties of 3D-PEEK. However, it cannot simultaneously improve strength and ductility. Here, a cost-effective postprocessing method is developed to improve the mechanical properties of 3D-PEEK, based on annealing in nonsolvent vapor at room temperature. The annealing in nonsolvent vapor at room temperature simultaneously improves the strength, ductility, and fracture energy of as-printed 3D-PEEK by 22.6%, 151.3%, and 109.1%, respectively. The improved mechanical properties are attributed to enhanced interfacial bonding, increased crystallinity, decreased pinhole defects, and stress relaxation in the 3D-PEEK. Moreover, the annealing in both polar solvents (such as acetone and chloroform) and nonpolar solvents (such as n-hexane) are demonstrated to be effective for improving the mechanical properties of 3D-PEEK. The nonsolvent vapor-annealed 3D-PEEK can thus have potential applications in the fields of medical implants, automotive, aerospace, and more.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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