Table 1.

Inherent viscosities and solubility behaviors of PAIs.

Polymer Code	ηinh (dL/g) a		Solvents b,c
	PAA	PAI	NMP	DMAc	DMF	DMSO	m-Cresol	THF
6a	0.69	−	+−	+−	+−	+−	−	−
6b	0.91	−	+−	+−	+−	+−	−	−
6c	0.67	0.66	+	+	+−	+	+−	−
6d	0.50	0.49	+	+	+−	+	+	−
6e	0.29	0.35	+	+	+	+	+−	−
6f	0.68	0.64	+	+	+	+	+	−
MeO-6a	0.74	0.77	+	+	+	+	+-	−
MeO-6b	0.87	0.88	+	+	+-	+	+-	−
MeO-6c	0.58	0.58	+	+	+	+	+	−
MeO-6d	0.70	0.70	+	+	+-	+	+	−
MeO-6e	0.59	0.57	++	++	++	++	+	−
MeO-6f	0.92	0.56	++	++	++	++	+	+−
t -Bu-6a	0.40	0.80	+	+	+	+	+	−
t -Bu-6b	0.45	0.65	+	+	+	+	+	−
t -Bu-6c	0.65	0.64	+	+	+	+	+	−
t -Bu-6d	0.39	0.58	+	+	+	+	+	−
t -Bu-6e	0.46	0.43	++	++	++	++	+	−
t -Bu-6f	0.48	0.50	++	++	++	++	+	+−

^a Inherent viscosity measured at a concentration of 0.5 dL/g in DMAc at 30 °C. ^b The qualitative solubility was tested with 10 mg of a sample in 1 mL of stirred solvent. ++: soluble at room temperature; +: soluble on heating; +−: partially soluble; −: insoluble even on heating. ^c Solvent: NMP: N-methyl-2-pyrrolidone; DMAc: N,N-dimethylacetamide; DMF: N,N-dimethylformamide; DMSO: dimethyl sulfoxide; THF: tetrahydrofuran.