Abstract
New photosensitive polyimides containing pendant propargyl ester group were synthesized, and the photochemical reaction of the resulting polyimides was investigated using photo-acid generators. The reaction of 4, 4′-diamino-3, 3′-dicarboxydiphenylmethane with 1.2 times amount of propargyl bromide was performed using 1, 8-diazabicyclo[5.4.0]-7-undecene (DBU), and the targeted diamine monomer containing pendant propargyl ester group was obtained with high yield. Poly(amic acid)s were prepared by the reaction of the diamine monomer containing propargyl ester group with various tetracarboxylic dianhydrides in dimethyl sulfoxide at room temperature for 8h. Poly(amic acid)s were then converted into polyimides using acetic anhydride I pyridine as a dehydrating agent at 90°C for 24h. The photochemical reaction of polyimide films was examined with various photo-acid generators (10mol-%). It was proved that the photoinitiated cationic polymerization of pendant propargyl ester group of the polyimides with photo-acid generator proceeded smoothly under UV-light irradiation to give insoluble polymer films in organic solvents.
