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Low environmental impact recycling process of continuous carbon fibers from epoxy-unidirectional carbon fibers structural composites ; Recyclage à faible impact environnemental de fibres de carbone continues, issues de composites structuraux époxy-nappes de carbone

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  • معلومة اضافية
    • Contributors:
      Interactions moléculaires et réactivité chimique et photochimique (IMRCP); Institut de Chimie de Toulouse (ICT); Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP); Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS); Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT); Institut National des Sciences Appliquées - Toulouse (INSA Toulouse); Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP); Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse); Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS); Centre interuniversitaire de recherche et d'ingénierie des matériaux (CIRIMAT); Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT); Université Paul Sabatier - Toulouse III; Emile Pérez; Eric Dantras; Philippe Ponteins
    • بيانات النشر:
      HAL CCSD
    • الموضوع:
      2023
    • Collection:
      Université Toulouse III - Paul Sabatier: HAL-UPS
    • نبذة مختصرة :
      The aim of this thesis is the tailoring and implementation of a low environmental impact recycling process of structural epoxy / unidirectional continuous carbon fibers (CF). Thermogravimetric and turbidimetric analysis, allowed us to assess the efficiency of the reactive formulas developed in the laboratory. The reaction medium made with propylene carbonate, hydrogen peroxide and citric acid was optimized by quantitative structure-property relationships (QSPR). The reactive formulation can depolymerize the epoxy matrix of a one-ply composite in less than 24 hours at 60 °C under atmospheric pressure. The process recovers continuous carbon fibers; their length only depends on the shape of the reactor. By using different models of epoxy matrices, the selectivity of the solution was determined, and a reaction mechanism was proposed. The latter shows the cleavage of C-N bonds due to network oxidation and the formation of N-H reactive functions, allowing chemical reactions to revalorize the depolymerized matrix. Recycled carbon fibers were analysed by scanning electron microscopy (SEM) and tensile tests. They exhibit a clean surface and 89 % of the Young Modulus of virgin sized carbon fibers was maintained. Recycled continuous carbon fibers were used to develop biobased epoxy matrix composites. Virgin carbon fibers composites using the same biobased matrix were used as reference. SEM analysis of cryo-fractured composites show a similar CF/matrix continuity. At glassy state, the shear conservative modulus was measured by dynamic mechanical analysis (DMA) with a value of 3.2 GPa for recovered carbon fibers composites and 4.1 GPa for original carbon fibers composites. This deviation is due to lack of sizing of the recycled CF. The results show the performance and the significance of continuous CF recycling for the development of technical composites. This research project was carried out within a CIFRE / ANRT PhD contract, involving Expleo company and the research teams of SMODD / IMPRCP and PHYPOL / CIRIMAT at ...
    • Relation:
      NNT: 2023TOU30075; tel-04415359; https://theses.hal.science/tel-04415359; https://theses.hal.science/tel-04415359/document; https://theses.hal.science/tel-04415359/file/2023TOU30075a.pdf
    • الدخول الالكتروني :
      https://theses.hal.science/tel-04415359
      https://theses.hal.science/tel-04415359/document
      https://theses.hal.science/tel-04415359/file/2023TOU30075a.pdf
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.2E4CF95E