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 a first divalent unit represented by formula:

• and
• at least one of
• a second divalent unit represented by formula:
• and
• a monovalent unit selected from the group consisting of —S—CtH2t+1 and —S—CrH2r-A;
• or
• a monovalent unit represented by a formula selected from the group consisting of:
• —S—CbH2bC(O)CbH2b—P(O)(OY1)2;
• and
• —S—CbH2b−1[OC(O)CbH2b—P(O)(OY1)2]2,
• wherein
• R′, R″, and R′″ are each independently hydrogen or alkyl having from 1 to 4 carbon atoms;
• V is alkylene that is optionally interrupted by at least one ether linkage or amine linkage;
• t is an integer having a value from 4 to 22;
• r is an integer having a value from 2 to 10;
• A is selected from the group consisting of —OH, —COOY1, and —SO3Y1;
• each Y1 is independently selected from the group consisting of hydrogen, alkyl, a counter cation, and a bond to the surface;
• and
• each b is independently an integer from 1 to 5.

A method of making a polymeric or oligomeric composition, the method comprising reacting components comprising at least one component represented by formula:

• Rf—C(O)—N(R1)—X—O—C(O)—C(R)═CH2;
• and
• at least one component represented by formula:
• (YO)2—P(O)—C(R′)═CH2 or
• (YO)2—P(O)—O—V—O—C(O)—C(R′)═CH2;
• wherein
• each Rf is independently a perfluoropolyether group;
• R, R′, and R1 are each independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms;
• each V is independently alkylene that is optionally interrupted by at least one ether linkage or amine linkage;
• and
• each Y is independently selected from the group consisting of hydrogen, alkyl, trialkylsilyl, and a counter cation.