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Fabrication and characterization of PEEK/PEI multilayer composites

DOI: 10.3390/polym12122765 DOI Help

Authors: Ángel Alvaredo-Atienza (IMDEA Materials Institute; Fundación para la Investigación (FIDAMC)) , Lu Chen (Universidad Politécnica de Madrid) , Verónica San-Miguel (University of Carlos III of Madrid) , Alvaro Ridruejo (Universidad Politécnica de Madrid) , Juan P. Fernández-Blázquez (IMDEA Materials Institute)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Polymers , VOL 12

State: Published (Approved)
Published: November 2020
Diamond Proposal Number(s): 20494

Open Access Open Access

Abstract: Polyetheretherketone (PEEK)/polyetherimide (PEI) blends (50/50, v/v) keeping the crystal phase of PEEK have been manufactured by alternate PEEK/PEI layer stacking. This strategy avoided the complete miscibility of both polymers, keeping layers of PEEK and PEI unmixed along the sample thickness, as well as promoting the formation of a smooth interfacial layer where PEEK and PEI were mixed. The properties of this interface after processing at molten state and different times was studied by DSC, DMA, and X-Ray synchrotron. These techniques allowed monitoring the evolution of glass transition, where isolated Tg’s for both pristine polymers were observed even after long processing time. PEEK crystallinity slightly decreased during manufacturing, whereas PEEK crystal parameters did not vary. These observations show that, although the interface—the zone where both polymers are mixed—grew, layers with pristine polymers remained even after prolonged processing time. The preservation of the PEEK crystallinity was also observed in the mechanical properties of the multilayer PEEK/PEI films, which were compared with pristine PEEK and PEI films. Multilayer samples processed for shorter times rendered higher young modulus, tensile strength, and strain at break.

Journal Keywords: PEEK; PEI; multilayer; miscibility; glass transition; synchrotron radiation

Subject Areas: Materials

Instruments: I22-Small angle scattering & Diffraction


Discipline Tags:

Composite Materials Material Sciences Polymer Science

Technical Tags:

Scattering Small Angle X-ray Scattering (SAXS) Wide Angle X-ray Scattering (WAXS)