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 63

Table 6.
Solubility of various new poly(ether imide)s a

Solvent b

Polymer code

NMP DMAc DMF Pyridine Cyclohexanone THF Chloroform

m-tert + + + + + + + + + + + + +

TP-tert + + + + + + + + + + + + + +

Tcardo-tert + + + + + + + + + + + + + +

TMA-tert + + + + + + + + + + + + + +

+ + + + + - + + + + +

Cyclo-tert

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

Phcardo-tert

m-m + + + + + + + + + + - + -

TP-m + + + + + + + + + + + + + +

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

Tcardo-m

TMA-m + + + + + + + + + + + + + +

Cyclo-m + + + + + - + + + + + +

Phcardo-m + + + + + + + + + + + + +

BPDA-m c + + + - - + + - -

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

Source : Refs. 38-43.

bility between these poly(ether imide)s indicated that poly(ether imide)s contain-
ing the isopropylidene, kink and tert-butylcyclohexane groups shown slightly bet-
ter solubility than the others. For comparison, polyimide BPDA-m, shown below,
containing biphenylene without pendent cyclododecylidene was prepared from
4,4'- bis(4-aminophenoxy)biphenyl with dianhydride. It was observed that poly-
imide (BPDA-m) was nearly insoluble in the test solvents and showed poorer
solubility than its analogous polymer (Cyclo-m, Scheme III). This may be due to
the presence of the bulky pendent group which decreases the inter-chain interac-
tion between rigid aromatic repeat units, resulting in enhanced solubility.