| abstract |
Polyimides comprising repeating units of the general formula (I); and polyamic acids comprising repeating units of the general formula (IV): wherein R1 and R2 are each H or C1-20 alkyl; Z is a fused polycyclic aromatic group or a group of the general formula (i), (ii), (iii), (iv), or (v): X is -CO- or -C(=N2)-; Y is a direct bond, -CH2-, -O-, -SO2-, -S-, -CO-, or -C(=N2)-; W is a direct bond, -CH2-,-C(CH3)2-, -C(CF3)2-, -S-, -SO-, -SO2-, or O-; b, m and n are each 0 or 1; r is C1-4 alkyl, halogeno, or phenyl; and a is 0 to 3. |