| abstract |
The present invention relates to a copolymer comprising fluorinated units of formula (I): (I) -CX1X2-CX3X4- in which each of the X1, X2, X3 and X4 is independently chosen from H, F and alkyl groups comprising from 1 to 3 carbon atoms which are optionally partially or totally fluorinated; and fluorinated units of formula (II): (II) -CX5X6-CX7Z- in which each of the X5, X6 and X7 is independently chosen from H, F and alkyl groups comprising from 1 to 3 carbon atoms which are optionally partially or totally fluorinated, and in which Z is a photoactive group of formula -Y-Ar-R, Y representing an oxygen atom or an NH group or a sulfur atom, Ar representing an aryl group, preferably a phenyl group, and R being a monodentate or bidentate group comprising from 1 to 30 carbon atoms. The present invention also relates to a process for preparing this copolymer, to a composition comprising this copolymer, and also to a film obtained from said copolymer. |