Chemistry Reference
In-Depth Information
Table 1.
Solubility behaviors of various sulfonated polyimides in their triethylammonium salt forms
Polyimide
m-Cresol
DMSO
NMP
+
+
NTDA-ODADS
-
+
-
NTDA-ODADS/ODA(1/1)
-
+
-
NTDA-ODADS/BAPB(1/1)
-
+
+
NTDA-ODADS/BAPF(1/1)
-
+
+
NTDA-ODADS/BAPHF(1/1)
-
+
+
NTDA-BAPFDS
-
+
+
NTDA-BAPFDS/ODA(4/1)
-
+
+
NTDA-BAPFDS/ODA(2/1)
-
+
+
NTDA-BAPFDS/ODA(1/1)
-
+
+
NTDA-BAPFDS/BAPB(4/3)
-
+
+
NTDA-BAPFDS/BAPPS(2/1)
-
+
-
NTDA-BAPBDS
-
+
+
NTDA-BDSA
-
+
-
NTDA-BDSA/ODA(1/1)
-
+ -
-
NTDA-BDSA/BAPB(1/1)
-
+
+
NTDA-BDSA/BAPF(1/1)
-
+
+
NTDA-BDSA/BAPHF(1/1)
-
“+”: soluble, “+ -”: partially soluble, “-”: insoluble.
Table 2.
Molecular weights and molecular weight distributions of proton exchanged polyimides
Polyimide
Mn
Mw
Mw/Mn
NTDA-ODADS
18000
53000
2.9
NTDA-ODADS/ODA(1/1)
16000
72000
4.5
NTDA-BAPFDS
16000
32000
2.0
NTDA-BAPFDS/ODA(2/1)
17000
39000
2.3
NTDA-BDSA
15000
34000
2.3
NTDA-BDSA/ODA(1/1)
14000
47000
3.4
stability of this polyimide. The sulfonic acid group of NTDA-BAPFDS started to
decompose around 270°C.
Table 2 lists the molecular weights and molecular weight distributions of some
of the prepared polyimides (in proton form) determined by gel permeation chro-
matography (GPC). The number-averaged molecular weights (Mn) of these sul-
fonated polyimides are roughly close to each other. However, the molecular
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