CPC C09K 19/56 (2013.01) [C08G 73/1032 (2013.01); C08G 73/1042 (2013.01); C08G 73/1078 (2013.01); C08J 5/18 (2013.01); G02F 1/133711 (2013.01); G02F 1/133784 (2013.01); C08J 2379/08 (2013.01); G02F 1/1339 (2013.01); G02F 1/13392 (2013.01); G02F 2202/28 (2013.01)] | 32 Claims |
1. A liquid crystal alignment agent, comprising a diamine monomer, a dianhydride monomer, a piperazine monomer, and a solvent, wherein the piperazine monomer has a general structural formula of
wherein R represents an amino group or an anhydride group;
the diamine monomer comprises a first diamine compound and a second diamine compound;
the first diamine compound comprises at least one from the group consisting of compounds shown in general structural formulas I and II:
in the general structural formula I, A represents a chemical bond, an alkyl chain CnH2n, —O—, —NH—, —S—, or —SO2—, wherein n=1-20; and R represents —H or —CH3;
in the general structural formula II, R represents —H or —CH3;
the second diamine compound comprises at least one from the group consisting of compounds shown in general structural formulas III and TV:
in the general structural formula TIT, R represents an alkyl chain CnH(2n+1), wherein n=1-50;
in the general structural formula IV, R represents an alkyl chain CnH(2n+1), wherein n=1-50.
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