Influences des instabilités convectives sur l'état de surface final des films polymères fabriqués par procédé de séchage

Abstract

Polymer film formation from drying of polymer solution is very important process for many applications: coating, printing, nanotechnology. Some applications (automobile coatings) require films with high surface quality with a roughness in range of visible light wavelength. Often drying polymer solutions yields corrugated surfaces. This corrugation can be due to: 1) mechanical instabilities due to buckling of dried surface resulting from a heterogeneous evaporation; 2) hydrodynamic instabilities. In this work we studied in situ the formation of corrugated surface and we related these mechanisms to hydrodynamic convections.