
15: POLY(IMIDE)S 347
Table 15.3 Poly(imide)s Produced by the Aqueous
Route [33]
Dianhydride Diamine Type
4,4
-BTDA TDA P84
4,4
-BPADA MPD Ultem® 1000
4,4
-BPDA +
PEPA
3,4
-
Oxydianiline-
+ APB
PETI-5
After cooling down to room temperature, the aqueous
solution of the dicarboxylic acid is neutralized with the
respective diamine and a salt is formed. The salt pre-
cipitates out from the aqueoussolution. The precipitate
is dried and heated up to 180–220
◦
C for dehydration
to form the final PI product [34,33].
Products that have been produced by the aqueous
route are shown in Table 15.3. The infrared (IR) spec-
tra of commercially available Ultem® 1000 and the
type