Synthesis and characterization of new organosoluble poly(ether imide)s derived from various novel bis(ether anhydride)s - Polyimides and Other High Temperature Polymers - page 62

Table 5.
Solubility of polyimides derived from various commercial dianhydrides a

Solvent b

Polymer code

Conc.
H 2 SO 4

NMP DMSO DMAc DMF m-Cresol Pyridine

PMDA-tert - - - - - - + +

BPDA-tert + - - - - + - - + +

ODPA-tert + - - - - + - + +

BTDA-tert + - - - + - + +

+ + + + + + + + + + + + + +

6FDA-tert

SDPA-tert + + + + + + + + + + + + +

PMDA-m - - - - - - + +
BPDA-m - - - - + - + +
ODPA-m + - - - - + - + +
BTDA-m - - - - - - + +
6FDA-m + + + + + + + + + + + + +
SDPA-m + + + - + + + + + + + - + +
SDPA-BAPB c - - - - - - + +
a. Solubility: ++, soluble at room temperature; +, soluble on heating at 70 ° C; + -, partially solu-
ble; -, insoluble.
b. Abbreviations: NMP: N -methyl-2-pyrrolidinone; DMSO: dimethylsulfoxide; DMAc: N , N -
dimethylacetamide; DMF: N,N -dimethylformamide; THF: tetrahydrofuran.
c. Analogous polyimide SDPA-BAPB:

Source : Refs. 17 and 48.

considerably higher than that of analogous polyimide (SDPA-BAPB) in all or-
ganic solvents, indicating that the solubility of polyimide was enhanced by intro-
ducing noncoplanar conformation of 2,2'-dimethyl substituted biphenylene unit
in the polymer backbone.
The solubilities of these poly(ether imide)s in several organic solvents at
5.0% (w/v) are also summarized in Table 6. Almost all of the poly(ether imide)s
were soluble in the test solvents including N-methyl-2-pyrrolidinone, N,N-
dimethylacetamide (DMAc), pyridine, cyclohexanone, tetrahydrofuran and even
in chloroform at room temperature. The good solubility of these poly(ether im-
ide)s was possibly imparted by the presence of flexible ether, isopropylidene
group, bulk pendent group, noncoplanar biphenylene and kink linkage, which
reduced the polymer chains interaction and rigidity. A comparison of the solu-