Chemistry Reference
In-Depth Information
In the third method, an anhydride, like, for instance, trimellitic anhydride, is condensed with a
diamine to form a preliminary condensate. An acetylated diamine can be used in this initial
condensation [
85
]:
O
O
O
HOOC
R
+
N
N
125-325
o
C
2
O
HH
O
O
O
O
R
O
N
N
+
O
O
2CH
3
COOH
HH
O
O
This is followed by a reaction with the same or a different diamine:
O
O
NH
2
O
O
R
N
N
+
O
n
O
n
HH
O
O
O
O
NH
2
O
O
R
N
N
N
N
HH
n
O
O
The same techniques are applied to preparations of polyester-imides. A diester can be formed first
from trimellitic anhydride:
O
O
O
O
O
O
O
O
O
O
The product is then condensed with a diamine to form a polyester-imide:
O
O
O
N
N
O
n
O
O
O
O
