2/7/2024 0 Comments Peek material structure![]() One method to combine two or more polymers is the creation of a layered structure, which may lead to a broad range of improved properties. The properties of the final material depend strongly on the morphology, processing history, formulation, and interactions between the individual components. Sometimes, single polymer components do not reach the end use requirements, necessitating the use of a combination of two or more polymers. The development of technologically relevant polymer blends and polymer composites depends on the synergistic combination of two or more polymers with the aim to improve the final properties. Multilayer samples processed for shorter times rendered higher young modulus, tensile strength, and strain at break. 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. 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. PEEK crystallinity slightly decreased during manufacturing, whereas PEEK crystal parameters did not vary. These techniques allowed monitoring the evolution of glass transition, where isolated T g’s for both pristine polymers were observed even after long processing time. The properties of this interface after processing at molten state and different times was studied by DSC, DMA, and X-Ray synchrotron. 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. ![]() Polyetheretherketone (PEEK)/polyetherimide (PEI) blends (50/50, v/v) keeping the crystal phase of PEEK have been manufactured by alternate PEEK/PEI layer stacking.
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