Effect of curing temperature on pretilt angles of polyimide alignment layer

Abstract

Poly(amic acid ester)and poly(amic ester)of polyimide precursors were prepared from the corresponding poly(amic acid)with controlling esterification ratio of the pendent carboxylic group. These three different precursors were examined for the generation of pretilt angle after curing at various temperatures. All three alignment layers generated maximum tilt angle when they were cured at the temperature approximately 20°C below the maximum imidization temperature. The results indicated that the proper stiffness of main chain and residual functional group in the alignment layer were important for the generation of high pretilt angle.