Fluorinated compositions and surface treatments made therefrom

An article having a surface, wherein at least a portion of the surface is in contact with a polymeric or oligomeric composition, the polymeric or oligomeric composition comprising at least one first divalent unit represented by formula:

• and
• a monovalent unit comprising a thioether linkage and at least one terminal Z1 group, wherein each Z1 group is independently selected from the group consisting of —P(O)(OY1)2 and —O—P(O)(OY1)2;
• wherein
• each Rf is independently a perfluoropolyether group;
• each Q is independently selected from the group consisting of a bond, —C(O)—N(R1)—, and —C(O)—O—;
• R and R1 are each independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms;
• each X is independently selected from the group consisting of alkylene, arylalkylene, and alkylarylene, wherein alkylene, arylalkylene, and alkylarylene are each optionally interrupted by at least one ether linkage;
• and
• each Y1 is independently selected from the group consisting of hydrogen, alkyl, a counter cation, and a bond to the surface.