Preheat Compression Molding for Polyetherketoneketone: Effect of Molecular Mobility

Zhang, Xiaohua; Jiao, Meng-Xiao; Wang, Xin; Li, Bo-Lan; Zhang, Feng; Li, Yanbo; Zhao, Jingna; Jin, Hehua; Yang, Yu

doi:10.1007/s10118-021-2649-1

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…However, when the forming pressure is increased from 9 MPa to 15 MPa, the samples compressed from PEEK powder showed elastic recovery after unloading, resulting in gaps within the material 28 . In addition, the mobility of PEEK molecules is inhibited, and melted PEEK is di cult to diffuse through the pores, resulting in bonding defects in localized areas of the material and a gradual weakening of the overall strength 29 . Therefore, the optimum pressure for the preparation of PEEK materials by the compression molding technique under laboratory conditions is 9 MPa.…”

Section: Resultsmentioning

confidence: 99%

Tribological performance study of low-friction PEEK composites under different lubrication conditions

Wu,

Yan,

Sun

et al. 2023

Preprint

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To improve the friction and wear performance of polyetheretherketone (PEEK). In this paper, a low-friction PEEK-based composite with PEEK as the matrix material, polytetrafluoroethylene (PTFE) as the solid lubricant, and poly-p-phenylene-terephthamide (PPTA) as the reinforcing material were prepared by compression molding technique, and then the optimal preparation condition for PEEK was gained by exploratory experiments. Finally, the tribological performance of PTFE/PPTA/PEEK composites was researched under dry friction and oil lubrication conditions. The microstructure of the wear mark was observed by scanning electron microscope and white light interference microscope, and the wear mechanism of PEEK and its composites under different lubrication conditions were analyzed. The results show that the main wear mechanisms of the friction pair consisting of PTFE/PPTA/PEEK composites and bearing steel are ploughing and adhesive wear. When the friction pair slides, PPTA reduces the wear of the composite caused by its high fiber strength and good thermal stability, and the coefficient of friction (COF) is reduced because the PTFE on the surface is pressed into a smooth, solid lubricating film. Whether under dry friction or oil lubrication conditions, the PEEK composites containing 25wt% PTFE and 6wt% PPTA both have the lowest wear and lower COF.

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Section: Resultsmentioning

confidence: 99%

Tribological performance study of low-friction PEEK composites under different lubrication conditions

Wu,

Yan,

Sun

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In addition, this high pressure restricts the mobility of PEEK molecules, complicating the diffusion of molten PEEK through the pores and leading to localized bonding flaws. This phenomenon gradually weakens the material overall strength [29]. Therefore, the data suggest that a 9 MPa forming pressure is optimal for fabricating PEEK materials through the compression molding method in a laboratory setting.…”

Section: Impact Of Molding Pressure On the Tribological Behavior Of Peekmentioning

confidence: 94%

Tribological Performance Study of Low-Friction PEEK Composites under Different Lubrication Conditions

Wu,

Yan,

Sun

et al. 2024

Applied Sciences

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This study introduces a low-friction composite based on PEEK to improve its friction and wear properties. The composite incorporates PTFE as a solid lubricant and utilizes PPTA as a reinforcing material within the PEEK matrix. These components were prepared utilizing a compression molding method, followed by a series of exploratory experiments to identify the optimal preparation conditions for PEEK. This research assesses how the PTFE/PPTA/PEEK composites perform in terms of friction and wear under dry and oil-lubricated conditions. By examining wear tracks using scanning electron microscopy and white light interference microscopy, this study aims to uncover the wear mechanisms of PEEK and its composites under different lubrication scenarios. Results show that the main wear mechanisms for the PTFE/PPTA/PEEK composites and bearing steel are ploughing and adhesive wear. The presence of PPTA helps reduce wear by leveraging its strong fibers and thermal stability, while the coefficient of friction decreases as PTFE creates a smooth, solid lubricating film on the surface. Notably, PEEK composites containing 25 wt% PTFE and 6 wt% PPTA demonstrate the lowest wear rates and reduced coefficient of friction in both dry and oil-lubricated conditions.

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Carbon fiber/polyetherketoneketone composites. Part I: An ideal and uniform composition via solution‐based processing

Zhang

Jiao

et al. 2022

Polymer Composites

Self Cite

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As limited by the low dissolubility, powder-and dispersion-based composition methods are used to prepare carbon fiber (CF)/polyaryletherketone (PAEK) prepregs. Owing to the high content of ketone groups, polyetherketoneketone (PEKK) is found to have a high dissolubility in fluorine-and/or chlorinecontaining solvents. It is revealed that PEKK can form colloidal solutions with a particle size down to tens of nm, paving the way for a true solution-based impregnation toward advanced CF/PEKK composites. After a fabrication route of impregnation, preheating, and compression molding, PEKK was found to uniformly and tightly cover all the CFs within a thickness of 1-3 μm in the final composites. Such limited spacing and the fiber surface strongly suppress the crystallization of PEKK. As a result, the composites exhibited a tensile strength of 1.85 GPa, 94.9% that of the ideal one according to the rule of mixture.

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Preheat Compression Molding for Polyetherketoneketone: Effect of Molecular Mobility

Cited by 8 publications

References 36 publications

Tribological performance study of low-friction PEEK composites under different lubrication conditions

Tribological performance study of low-friction PEEK composites under different lubrication conditions

Tribological Performance Study of Low-Friction PEEK Composites under Different Lubrication Conditions

Carbon fiber/polyetherketoneketone composites. Part I: An ideal and uniform composition via solution‐based processing

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