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Influence of very long aging on the relaxation behavior of flame-retardant printed circuit board epoxy composites under mechatronic conditions

Authors

  • Mélanie Lé-Magda,

    1. Advanced Materials and Mechanical Engineering-Laboratoire d'Etude et de Caractérisation des Amorphes et de Polymères (AMME-LECAP EA4528) International Laboratory, Université et Institut National des Sciences Appliquées (INSA) de Rouen, 76801 Saint Etienne du Rouvray Cedex, France
    2. Groupe de Physique des Matériaux Unité mixte de recherche (UMR) CNRS Université et Institut National des Sciences Appliquées (INSA) de Rouen, 76801 Saint Etienne du Rouvray Cedex, France
    3. Laboratoire National d'Essai (LNE), 78297 Trappes, France
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  • Eric Dargent,

    Corresponding author
    1. Advanced Materials and Mechanical Engineering-Laboratoire d'Etude et de Caractérisation des Amorphes et de Polymères (AMME-LECAP EA4528) International Laboratory, Université et Institut National des Sciences Appliquées (INSA) de Rouen, 76801 Saint Etienne du Rouvray Cedex, France
    • AMME-LECAP EA 4528 International Laboratory, Université et INSA de Rouen, avenue de l'Université, 76801 Saint Etienne du Rouvray Cedex, France. E-mail: eric.dargent@univ-rouen.fr

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  • Jorge Arturo Soto Puente,

    1. Advanced Materials and Mechanical Engineering-Laboratoire d'Etude et de Caractérisation des Amorphes et de Polymères (AMME-LECAP EA4528) International Laboratory, Université et Institut National des Sciences Appliquées (INSA) de Rouen, 76801 Saint Etienne du Rouvray Cedex, France
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  • Alain Guillet,

    1. Groupe de Physique des Matériaux Unité mixte de recherche (UMR) CNRS Université et Institut National des Sciences Appliquées (INSA) de Rouen, 76801 Saint Etienne du Rouvray Cedex, France
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  • Emmanuelle Font,

    1. Laboratoire National d'Essai (LNE), 78297 Trappes, France
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  • Jean-Marc Saiter

    1. Advanced Materials and Mechanical Engineering-Laboratoire d'Etude et de Caractérisation des Amorphes et de Polymères (AMME-LECAP EA4528) International Laboratory, Université et Institut National des Sciences Appliquées (INSA) de Rouen, 76801 Saint Etienne du Rouvray Cedex, France
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Abstract

Very long aging times, up to 15,100 h (629 days) at 110°C, were achieved on flame-retardant printed circuit board laminates commonly used in automotive design. This composite was fabricated from glass fibers embedded in an epoxy resin. Aging was performed in an oven under an air atmosphere at a temperature lower than the glass-transition temperature. Temperature-modulated differential scanning calorimetric analysis was used to investigate the influence of such aging on the glass-transition phenomena. A new amorphous phase appeared during aging. By extending the analysis to samples collected at different thicknesses, we demonstrated the existence of a time-dependent gradient of the properties. A skin–core structure was evidenced, and this slowed down oxidation and allowed physical aging to occur in the bulk sample. An exponential law described the variations of the glass-transition of the new external compound. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 786-792, 2013

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