Diamine and polyamic acid derived therefrom for liquid crystal orientation applications

A diamine comprising a structure of formula (I)

• wherein X and Y are independently a divalence group selected from the group consisting of:
• —O—, —(C═O)—O—, —O—(C═O)—, —(C═O) —NH—, and —NH—(C═O)—;
• and R has a structure of formula (II):
• wherein R1 is selected from the group consisting of:
• wherein D1, D2, and D3 are independently selected from the group consisting of:
• —NH—, —O—, and —S—;
• d1, d2, and d3 are independently 0 or 1;
• R6, R7, and R8 are independently selected from the group consisting of:
• hydrogen, halogen, and C1-C30 alkyl;
• and Z is selected from the group consisting of:
• wherein, in formulas (VI-1) and (VI-5), D4, D5, D6, and D7 are independently selected from the group consisting of:
• d4, d5, d6, and d7 are independently 0 or 1;
• R9 is a C11-30 linear chain alkyl;
• R10 is selected from the group consisting of:
• hydrogen, fluorine, and C1-6 alkyl;
• P and Q are independently selected from the group consisting of:
• 1,4-phenylene, 1,4-cyclohexylene, 1,4-cyclohexenylene, and 1,4-cyclohexadienylene;
• and e and f are independently an integer of 0 to 2, and cannot be 0 at the same time;
• wherein, in formula (II), R2, R3, R4, and R5 are independently selected from the group consisting of:
• hydrogen and C1-C3 alkyl;
• and n and m are independently an integer of 0 to 3;
• and wherein, when R1 is formula (VI) and Z is formula (VI-1), n and m cannot be 0 at the same time.