Multiscale Mechanical Characterization of Polyether-2-ketone (PEKK) for Biomedical Application

Area of Science:

• Materials Science
• Polymer Science
• Additive Manufacturing

Background:

• High-performance polymers like Polyether-ether-ketone (PEKK) are crucial in aerospace and medical fields.
• The mechanical behavior of 3D-printed PEKK requires thorough investigation, especially concerning multiscale properties and biomechanical implications.
• Understanding the correlation between different scales of mechanical properties is vital for applications like osteointegration.

Purpose of the Study:

• To explore the mechanical behavior of 3D-printed PEKK using a comprehensive multiscale approach.
• To correlate global and local mechanical properties, down to the nanoscale.
• To provide a detailed understanding of 3D-printed PEKK for process optimization and customized applications.

Main Methods:

• Multiscale mechanical testing including nanoindentation, tensile, and compression tests.
• Digital Image Correlation (DIC) for strain distribution analysis.
• Scanning Electron Microscopy (SEM), Computed Tomography (CT), and confocal microscopy for fracture analysis, internal structure, and surface morphology.

Main Results:

• Detailed characterization of PEKK mechanical behavior across multiple scales, from nanoscale to macroscopic.
• Identification of fracture modes and internal structural features like voids.
• Assessment of surface morphology and its influence on material properties.

Conclusions:

• The multiscale approach provides a holistic understanding of 3D-printed PEKK's mechanical performance.
• Findings contribute to optimizing 3D printing processes for PEKK to tailor material properties.
• This research advances the knowledge of PEKK as an additive manufacturing material and highlights the importance of multiscale characterization.