Composition comprising perfluoropolyether

A composition comprising an aryl perfluoropolyether which is a monofunctional aryl perfluoropolyether having the formula of Rf—(Y)a—(CtR(u+v))—(O—CtR1(u+v))b—R wherein

• Rf has a formula weight of about 400 to about 15,000;
• Rf comprises repeat units selected from the group consisting of
• (a) J-O—(CF(CF3)CF2O)c(CFXO)dCFZ—,
• (b) J1-O—(CF2CF2O)e(CF2O)fCFZ1—,
• (c) J2-O—(CF(CF3)CF2O)jCF(CF3)—,
• (d) J3-O-(CQ2-CF2CF2—O)k-CQ2-,
• (e) J3-O—(CF(CF3)CF2O)g(CF2CF2O)h(CFX—O)i—CFZ—,
• (f) J4-O—(CF2CF2O)k—CF2—, and
• (g) combinations of two or more thereof;
• and
• where
• the units with formulae CF3CF2O and CF2O are randomly distributed along the chain;
• J is CF3, C2F5, C3F7, CF2Cl, C2F4Cl, C3F6Cl, or combinations of two or more thereof;
• c and d are numbers such that the c/d ratio ranges from about 0.01 to about 0.5;
• X is —F, —CF3, or combinations thereof;
• Z is —F, —Cl or —CF3;
• Z1 is —F or —Cl,
• J1 is CF3, C2F5, C3F7, CF2Cl, C2F4Cl, or combinations of two or more thereof;
• e and f are numbers such that the elf ratio ranges from about 0.3 to about 5;
• J2 is —C2F5, —C3F7, or combinations thereof;
• j is an average number such that the formula weight of Rf ranges from about 400 to about 15,000;
• J3 is CF3, C2F5, C3F7, or combinations of two or more thereof;
• k is an average number such that the formula weight of Rf ranges from about 400 to about 15,000;
• each Q is independently —F, —Cl, or —H;
• g, h and i are numbers such that (g+h) ranges from about 1 to about 50, the i/(g+h) ratio ranges from about 0.1 to about 0.5;
• J4 is CF3, C2F5, or combinations thereof;
• k′ is an average number such that the formula weight of Rf ranges from about 400 to about 15,000;
• each R is independently —H, a halogen, —OH, —SO3M, NR32, —NO2, —R4OH, —R4SO3M, —R4NR32, —R4NO2, —R4CN, —C(O)OR4, —C(O)OM, —C(O)R4, —C(O)NR32, or combinations of two or more thereof;
• except that when b=0, R cannot be four hydrogen atoms and —OH, or —Br, or —NH2;
• or R cannot be solely H or —NO2, or combinations thereof;
• each R1 is independently H, —R4, —OR4, a halogen, —OH, —SO3M, —NR32, —NO2, —CN, —R4OH, —R4SO3M, —R4NR32, —R4NO2, —R4CN, —C(O)OR4, —C(O)OM, —C(O)R4, —C(O)NR32, or combinations of two or more thereof provided that if b=0, the combination of R and R2 cannot be four or more hydrogen atoms and —OH, —Br, —NH2, or —NO2;
• each R3 is independently H, C1-C10 alkyl, or combinations of two or more thereof;
• R4 is a C1-C10 alkyl;
• M is a hydrogen or metal ion;
• a is 0 or 1;
• b is 0-5;
• Y is a divalent radical —CH2OCH2—, —(CH2)o—O—, —(CF2)n—, —CF2O—, —CF2OCF2—, —C(O)—, —C(S)—, or combinations of two or more thereof;
• n is about 1 to about 5;
• o is about 2 to about 5;
• t is equal to 6+u;
• u is any combination of 0, 2, 4, 6, 8, 10, 12, 14, 16;
• and
• v is independently either 2 or 4.