TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymer blend comprises poly(amide imide) (20-40 wt.%). The sulfonated polymer is sulfonated poly(ether ether ketone) has a weight average molecular weight of 20000 to 300000, and ion exchange equivalent of 1 to 2.5 mili-equivalent/g. Preferred Process: The process (P1) involves the reaction is carried out at 110-130 degrees C for 4-6 hours. Preferred Definitions:    T1=1,4-phenylene;and    Q=-T1-X-T1-.    EXAMPLE - To a concentrated sulfuric acid at 40 degrees C was added to Victrex 450 PF (RTM: poly(ether ether ketone)) and a sulfonation reaction was conducted by continuously stirring for 7-10 hours. After completion of the sulfonation reaction the reaction mixture was pour into a pool of ice water to precipitate the sulfonated polymer, which was then removed and washed, dried at 80 degrees C, and milled to powder. The sulfonated poly(ether ether ketone) (SPEEK) in powder form was then dissolved in N-methyl-2-pyrrolidinone (NMP) solvent, which was then filtered to remove SPEEK having a low degree of sulfonation to obtained NMP solution of SPEEK. Into a three-neck round-bottom glass flask methylene diparaphenylene isocyanate (MDI) (250 g) and 1,2,4-benzenetricarboxylic anhydride (TMA) (192 g) were added, followed by adding of NMP (400 g) as a solvent. The reaction solution in the flask was mechanically agitated from room temperature to 120 degrees C by heating. At the beginning the reaction solution was pale yellow and opaque, which became transparent at 50 degrees C and started bubbling. The bubbling became vigorous at 120 degrees C and the temperature in the flask would increase due to generation of reaction heat, which was kept at 120 degrees C by cooling. The reaction was continued until no bubbling was observed, and it took about six hours. The heating was then stopped, and a cooled solution of poly(amide imide) (PAI) was obtained. The resultant PAI was dissolved in pyridine solvent, and the PAI solution formed was mixed with the NMP solution of SPEEK prepared. The polymer blend solution after thorough mixing was coated on a glass plate to form a coating layer.