Lubricants with high thermal stability for heat-assisted magnetic recording

A perfluoropolyether lubricant compound comprising:

• (a) one or more main chain moieties, wherein the one or more main chain moieties are selected from the group consisting of molecules represented by the following formulas:
• (b) at least one perfluoropolyether moiety,
• wherein the following positions of the main chain moieties can be a perfluoropolyether moiety or another main chain moiety:
• R1 and R3 of Formula I;
• R1, R7, R9, and R14 of Formula III;
• R1 and R20 of Formula IV;
• and
• R3 and R7 of Formula V, and
• wherein the main chain moieties are selected from the group consisting of molecules represented by the formulas of Formula I, Formula III, Formula IV, and Formula V,
• wherein the remaining positions R1-R24 are independently H or fluorine, and
• wherein the perfluoropolyether moiety is derived from perfluoropolyether molecules selected from the group consisting of compounds having the following formulas:
• CF3CF2CF2O—[CF2CF2CF2O]n-CF2CF2COOH, (i)
• HOOC—CF2O—[CF2CF2O]m-[CF2O]n-CF2COOH, (ii)
• CF3-(O—CF2)m-(O—CFCF3-CF2)n-CF2COOH, (iii)
• HO—CH2CF2-(OCF2CF2)m-(OCF2)n-OCF2CH2-OH, (iv)
• CF2-CH2-O—CH2-CHOH—CH2-O—[CF2CF2O]m-[CF2O]n-O—CH2-CHOH—CH2-O—CH2-CF2, and (v)
• CF3CF2CF2O—[CFCF3CF2O]n-CFCF3CF2COOH, (vi)
• where m and n are integers between 0 and 40 with at least one of m or n being a non-zero number.