Preparation of polyurethane microspheres dispersed in an epoxy prepolymer

Abderrahim Djahieche (1) , Françoise Méchin (1) , Jean Pierre Pascault (1)

1 IMP - Ingénierie des Matériaux Polymères

Hydroxy-terminated polybutadiene (HTPB) was dispersed into a continuous phase of diglycidyl ether of bisphenol A (DGEBA) as droplets of 2µm average diameter. 4,4'-diisocyanato dicyclohexyl methane (H 12 MDI) was introduced to react with the dispersed phase via interfacial polycondensation. The reaction kinetics was studied at various temperatures and compared to that of homogeneous HTPB/H 12 MDI systems. Diisocyanate partition coefficient has been determined on a non-reactive dispersion prepared after neutralisation of hydroxyl groups of each phase, with p-tolylisocyanate (pTI). Results shows that 28 % of the introduced H 12 MDI would be present in the polybutadiene phase; further interfacial reaction leads to crosslinked polyurethane particles.

Domaines: Polymères

Abderrahim Djahieche, Françoise Méchin, Jean Pierre Pascault. Preparation of polyurethane microspheres dispersed in an epoxy prepolymer. Macromolecular Symposia, 2000, 151 (1), pp.353-358. ⟨10.1002/1521-3900(200002)151:1<353::AID-MASY353>3.0.CO;2-4⟩. ⟨hal-02045906⟩