Effect of dicumyl peroxide concentration on the polymerization kinetics of a polysilazane system

Raffaele D’elia (1) , Gilles Dusserre (1) , Sylvie del Confetto (2) , Nicolas Eberling-Fux (3) , Cédric Descamps (3) , Thierry Cutard (1)

1 ICA - Institut Clément Ader
2 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement
3 SAFRAN Group

The effect of dicumyl peroxide (DCPO) concentration on the polymerization kinetics of a polysilazane system has been investigated through DSC analyses. DCPO acts as polymerization initiator by activating the polyaddition of vinyl groups. The overall heat of reaction is found to be a linear function of the DCPO concentration above 1.5 wt%, due to the addition of the heat of fully initiated polymerization and the heat of DCPO decomposition. Below 1.5 wt% of DCPO, the polymerisation of polysilazane is not fully initiated and only part of the reaction occurs. The resulting overall heat of reaction is therefore lower than that provided by the linear law valid for higher concentrations. A two-reaction kinetic model built on this interpretation leads to a satisfactory representation of the DSC analyses performed for each DCPO concentration between 0.1 and 20 wt%

Mots clés: Dicumyl peroxide; Polymerization kinetics

Domaines: Sciences de l'ingénieur [physics]

Raffaele D’elia, Gilles Dusserre, Sylvie del Confetto, Nicolas Eberling-Fux, Cédric Descamps, et al.. Effect of dicumyl peroxide concentration on the polymerization kinetics of a polysilazane system. Polymer Engineering and Science, 2018, 58 (6), p.859-869. ⟨10.1002/pen.24638⟩. ⟨hal-01700705⟩