Compositions and articles including perfluoropolyether bottlebrush polymers and methods of making and using same

A composition comprising a perfluoropolyether (PFPE) bottlebrush polymer, wherein the PFPE bottlebrush polymer is a copolymer comprising a first subunit having a structure:

• wherein each R1 is independently a bond or an alkylene comprising at least 1 and up to 4 oxygen atoms, at least 1 and up to 5 carbon atoms, and, optionally up to 2 nitrogen atoms, up to 4 fluorine atoms, and up to 1 sulfur atom;
• wherein each R2 is independently H or an alkyl comprising at least 1 and up to 4 carbon atoms;
• wherein m=1-3;
• wherein n=1-4;
• wherein y=0-30;
• wherein z=10-80;
• and wherein the PFPE bottlebrush polymer comprises at least 90% (w/w) first subunits of Structure IV, based on total weight of the PFPE bottlebrush polymer, and further comprises a second subunit having the structure:
• wherein each R5 is independently a carbon-containing linker, optionally comprising up to 9 fluorine atoms, up to 1 silicon atom, up to 3 oxygen atoms, and up to 2 nitrogen atoms;
• wherein each R6 is independently H or an alkyl comprising at least 1 and up to 4 carbon atoms;
• and
• wherein x is from 1 to 6;
• and
• wherein Structure (VIII) is a cross-linker and is present in the composition at a concentration of at least 10 mol-%, based on a total amount of subunits.