Chemistry Reference
In-Depth Information
Reactions of bis maleimides with compounds containing active hydrogens can also lead to
formations of polyimides [
94
]:
N
N
O
O
n
+
n
N
R
N
N
N
O
O
O
O
N
N
N
R
N
N
N
O
O
n
Also, unsaturated diimides can be reacted with sulfur halides to form polyimides [
95
]:
O
O
S
x
Cl
2
n
N
N
Ar
O
O
O
O
S
x
N
Ar
N
Cl
Cl
O
O
n
where x = 1 or 2
Diepoxides can add to pyromelitimide in the presence of a base to form polyimides with pendant
hydroxyl groups [
96
]:
O
O
O
O
n
+
H
N
N
H
n
O
O
O
O
OH
O
O
O
N
N
O
n
OH
O
O
Tertiary amines and quaternary ammonium halides catalyze this reaction. Acetylation of the
pendant hydroxyl groups of the product yields polymers that are soluble in solvents like dioxane
and dimethylformamide.
