Applications de la sonde moleculaire aux composites a teneur elevee en solides—II. Étude du vieillissement

Three types of highly filled polymers were studied by the molecular probe to evaluate the applicability of this technique to ageing studies. The probe was found efficient in characterizing the behaviour of a given composite under a given set of conditions, or the effect of the nature of the solid phase on the stability of the binder. Thus, the post-curing effect in composite containing NH,₄CLO₄ and Al was analysed in detail. ΔH_a = 15·8 kcal/mole was found for this first-order reaction. In a second example, Fe₂O₃ was shown to decrease the post-curing effect leading to a very thermally stable material. Finally, the absence of aluminium resulted in a reduced hydrolytic stability of the binder.