SAMPE Benelux Student Meeting
(2022) INFLUENCE OF PROCESSING CONDITIONS ON CRYSTALLINE PHASE DEVELOPMENT AND MECHANICAL PROPERTIES OF PEEK — Location: Enschede (17.May.2022)
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- Abstract
- In the context of energy transition, the transportation sector faces new technological challenges: producing lightweight but high-performance structural parts and improving recyclability. Thermoset composite materials allow the manufacturing of light structures with excellent mechanical properties, but they are not recyclable and only processible via liquid molding techniques (e.g. vacuum infusion) or prepreg consolidation. Moreover, high-rate composite processing is impossible with such matrices: they need to undergo a curing step which often lasts a few hours (and often requires high temperatures). Transitioning from thermosetting to thermoplastic polymer matrix composites allows to overcome these shortcomings. However, this involves understanding how processing conditions influence the microstructure of the thermoplastic matrix and mechanical performances of the final parts. Among thermoplastic polymers, semi-crystalline polymers like polyether ether ketone (PEEK) offer the best mechanical properties. However, their mechanical behavior is related to the amount and characteristics of the crystalline phase, which depend on the processing conditions. In this work, the effect of various process parameters on the microstructure of PEEK is investigated. First, small-scale model experiments of the cooling process are performed in a differential scanning calorimeter (DSC), on both neat PEEK and carbon fiber-reinforced PEEK samples. Each specimen is heated above the melting temperature, and cooled down at a controlled rate ranging from -1°C/min to -1000°C/s. The degree of crystallinity is then assessed by DSC, and spherulite morphology is studied using wide-angle X-ray scattering (WAXS), as well as atomic force microscopy (AFM) and scanning electron microscopy (SEM) imaging of polished surfaces. For composite specimens, the deformation mechanisms occurring in the matrix at the micro-scale are also studied. Transverse compression of unidirectional composite specimens is performed in-situ in a SEM and followed by nano-scale digital image correlation (DIC).
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Citations
Vanpée, S., & et al. (2022). SAMPE Benelux Student Meeting. INFLUENCE OF PROCESSING CONDITIONS ON CRYSTALLINE PHASE DEVELOPMENT AND MECHANICAL PROPERTIES OF PEEK, Enschede. https://hdl.handle.net/2078.5/240989