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Optimization of Processing Conditions and Mechanical Properties for PEEK/PEI Multilayered Blends
Sebastián Andrés Toro1,2, Alvaro Ridruejo1, Carlos González1,3
1Department of Materials Science, Universidad Politécnica de Madrid, ETSI Caminos, C/Profesor Aranguren, 3, 28040 Madrid, Spain.
Polymers
|November 11, 2022
Summary
This study optimized polyetheretherketone/polyetherimide (PEEK/PEI) multilayered blends by controlling manufacturing parameters. The results show good PEEK-PEI adhesion and preserved PEEK crystallinity, enhancing mechanical properties for industrial applications.
Area of Science:
- Materials Science
- Polymer Science
- Composite Materials
Background:
- Polyetheretherketone (PEEK) and polyetherimide (PEI) are high-performance polymers with distinct advantageous properties.
- Combining PEEK and PEI in blends aims to leverage their synergistic characteristics.
- Conventional blending methods often lead to homogeneous mixtures, potentially compromising PEEK's inherent crystallinity.
Purpose of the Study:
- To investigate the manufacturing of PEEK/PEI multilayered blends with tailored parameters.
- To achieve simultaneous PEEK-PEI interfacial adhesion and preservation of PEEK crystallinity.
- To optimize the mechanical properties of these heterogeneous polymer blends.
Main Methods:
- Fabrication of a 50/50 (volume fraction) PEEK/PEI multilayered blend.
- Characterization of interface adhesion using three-point bending tests.
- Analysis of polymer behavior using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and X-ray diffraction (XRD).
Main Results:
- Processing temperatures below PEEK's melting point resulted in weak PEEK-PEI interfaces.
- A consolidation temperature of 350 °C induced partial mixing at the interface, ensuring good adhesion.
- The mixed interfacial region showed minimal sensitivity to processing time, maintaining distinct PEEK and PEI phases.
- PEEK crystallinity was largely preserved, unlike in conventional homogeneous blends.
Conclusions:
- Tailored processing parameters enable the reliable production of PEEK/PEI multilayered blends with good mechanical properties and short manufacturing cycles.
- The developed multilayered blends offer a promising combination of mechanical performance and joining capability.
- These PEEK/PEI blends are suitable for demanding applications in the automotive, marine, and aerospace industries.
