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Fabrication and Characterization of PEEK/PEI Multilayer Composites

IMDEA Materials Institute, C/Eric Kandel 2, Getafe, 28906 Madrid, Spain
Fundación para la Investigación (FIDAMC), Desarrollo y Aplicación de Materiales Compuestos, Avda. Rita Levi Moltalcini 29, Getafe, 28906 Madrid, Spain
Department of Materials Science, Universidad Politécnica de Madrid, ETSI Caminos. C/Profesor Aranguren, 3. 28040 Madrid, Spain
Department of Materials Science and Engineering and Chemical Engineering (IAAB), University of Carlos III of Madrid, Av. Universidad 30, Leganés, 28911 Madrid, Spain
Author to whom correspondence should be addressed.
Polymers 2020, 12(12), 2765;
Received: 30 October 2020 / Revised: 20 November 2020 / Accepted: 22 November 2020 / Published: 24 November 2020
(This article belongs to the Special Issue State-of-the-Art Polymer Science and Technology in Spain (2020,2021))
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. View Full-Text
Keywords: PEEK; PEI; multilayer; miscibility; glass transition; synchrotron radiation PEEK; PEI; multilayer; miscibility; glass transition; synchrotron radiation
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MDPI and ACS Style

Alvaredo-Atienza, Á.; Chen, L.; San-Miguel, V.; Ridruejo, Á.; Fernández-Blázquez, J.P. Fabrication and Characterization of PEEK/PEI Multilayer Composites. Polymers 2020, 12, 2765.

AMA Style

Alvaredo-Atienza Á, Chen L, San-Miguel V, Ridruejo Á, Fernández-Blázquez JP. Fabrication and Characterization of PEEK/PEI Multilayer Composites. Polymers. 2020; 12(12):2765.

Chicago/Turabian Style

Alvaredo-Atienza, Ángel, Lu Chen, Verónica San-Miguel, Álvaro Ridruejo, and Juan P. Fernández-Blázquez 2020. "Fabrication and Characterization of PEEK/PEI Multilayer Composites" Polymers 12, no. 12: 2765.

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