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Etude de l'imprégnation capillaire de tissus de verre

Abstract : Glass fabrics based prepregs are the main components of printed circuit boards. After impregnation by a polymeric resin, major defects concerning dielectric or mechanical properties of resulting boards can appear (striations, lack of resin, dryness, ....). Such defects are generally attributed to “bad wetting" of the fabric.
In order to determine if wettability is really responsible for these problems, we tried to characterise the thermodynamic surface properties of the fabric at both microscopic and macroscopic scales.
Microscopic scale characterisation allowed us to analyse the homogeneity of glass surface treatments and to identify or verify their chemical nature.
Macroscopic scale characterisation, based on capillary rise of liquids into the fabric, represented the main object of our work. The analysis is based on a modified Washburn model, well adapted for isotropic porous media. This basic model has been improved in order to take into account the specific aspects of glass fabric, like non-isotropy , existence of two populations of pores (macro- and micro-pores corresponding respectively to the space between glass yarns - made of hundreds of filaments - and the space between glass filaments), large exchange surface area (evaporation of the wetting liquid) and, finally, coupling of perpendicular yarns (double front of capillary progression).
At the end of this work, a method for the characterisation of glass fabrics has been proposed and validated. It leads to the determination of capillary radii into the porous structure as well as components of surface energy and acid/base character of glass surface. The control of such characteristics allows us to enhance our knowledge of the fabric/resin interface and the anticipation concerning the chemical compatibility between both materials.
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Submitted on : Wednesday, May 18, 2005 - 11:51:57 AM
Last modification on : Thursday, January 11, 2018 - 6:15:11 AM
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Jean-Marc Senecot. Etude de l'imprégnation capillaire de tissus de verre. Physique [physics]. Université de Haute Alsace - Mulhouse, 2002. Français. ⟨tel-00009280⟩

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