Patent ID: 7838074

Claim:
A process for preparing a substrate at least one surface of which is constituted by a polymer, wherein said process comprises the following steps in succession: a) brushing the polymer surface when the substrate is in an amorphous state so as to orientate macromolecules of the polymer in the same direction; b) bringing the polymer surface obtained at the end of step a) into contact with a vapor of a solvent so as to partially crystallize the polymer and cause nanostructuring of said surface, said solvent being selected such that: |δ poly −δ sol |/[(δ poly +δ sol )/2]<0.3, δ poly and δ sol representing the solubility parameters of the polymer and the solvent respectively; and γ sol <γ poly , γ sol and γ poly representing the free surface energies of the solvent and the polymer respectively.