High temperature interfacial tension measurements of PA6/PP interfaces compatibilized with copolymers using a spinning drop tensiometer

Claude Verdier (1) , Harry T M Vinagre (2) , Monique Piau (1) , Daniel D Joseph (2)

1 LR - Laboratoire de rhéologie
2 AEM - Department of Aerospace Engineering and Mechanics [Minneapolis]

Interfacial tension measurements of polyamide/polypropylene (PA6/PP) interfaces are reported at high temperature, using a spinning drop tensiometer, especially adapted to the study of the effects of copolymers. Copolymers in different amounts are included in the PP drop, and their migration towards the interface is inferred from the evolution of the drop diameter during the experiment. The importance of the compatibilizer is studied; small amounts of copolymer give rise to a significant decrease of the interfacial tension. This is due to effective migration of the copolymer, as deduced from diffusion coefficients. Above a critical concentration, the interfacial tension increases again. This phenomenon has not been observed before for such systems and is attributed to the presence of micelles in the bulk which prevent the copolymer migration through the creation of yield stresses.

Mots clés: interfacial tension; copolymer; spinning drop tensiometer; high temperature

Domaines: Polymères

Claude Verdier, Harry T M Vinagre, Monique Piau, Daniel D Joseph. High temperature interfacial tension measurements of PA6/PP interfaces compatibilized with copolymers using a spinning drop tensiometer. Polymer, 2000, 41, pp.6683-6689. ⟨hal-00322147⟩