Publications by authors named "Christian Garnier"

This review aims to report the status of the research on polyaryletherketone-based thermoplastic blends (PAEK). PAEK are high-performance copolymers able to replace metals in many applications including those related to the environmental and energy transition. PAEK lead to the extension of high-performance multifunctional materials to target embedded electronics, robotics, aerospace, medical devices and prostheses.

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In the present work, an ultrasonic, an induction, and a through transmission laser welding were compared to join carbon fibre reinforced polyetheretherketone (CF/PEEK) composites. The advantages and drawbacks of each process are discussed, as well as the material properties required to fit each process. CF/PEEK plates were consolidated at 395 °C with an unidirectional sequence and cross-stacking ply orientation.

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Polyethylene terephthalate (PET) is among the most used thermoplastic polymers in large scale manufacturing. Opaque PET is increasingly used in milk bottles to save weight and to bring a glossy white aspect due to TiO nanoparticles. The recyclability of opaque PET is an issue: whereas the recycling channels are well established for transparent PET, the presence of opaque PET in household wastes weakens those channels: opaque bottles cannot be mixed with transparent ones because the resulting blend is not transparent anymore.

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Article Synopsis
  • PEEK/PES blends typically aren't miscible, but using melt mixing at high temperatures with phenolphthalein allows for partial miscibility.
  • Differential scanning calorimetry and dynamic mechanical analysis show that phenolphthalein helps blend the two materials by shifting glass transitions and creating new side groups on their chains.
  • This process not only improves the compatibility between PEEK and PES but also results in enhanced adhesion and crystallization due to the plasticizing effect of phenolphthalein on PES.
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