In this contribution novel acid-base sulfonated poly(phthalazinone ether nitrile ketone)s (SPPENKs) membranes are introduced.The membranes are composed of SPPENKs as the acidic compounds

and polyetherimide(PEI) as the basic compounds

furthermore

redissolving SPPENKs and PEI in N-methylpyrrolidone (NMP) then cast directly onto clean glass substrates in dust free environment at 60℃ aiming at enhancing membrane toughness and other relative properties.The chemical structures of acid-base polymers were characterized by FT-IR.The properties of acid-base membranes were detected by swelling ratio (SR)

water uptake(WU)

hydrolysis resistance(HR)

oxidative resistance (OR)

thermal stability and ion-exchange capacity (IEC) et al.The results indicate that membranes of acid-base SPPENKs have good physicochemical properties.The broken time of acid-base proton conducting polymer membranes at 80℃ in water is over 2000 h except for SPPENK-40/PEI membrane.The IEC value of acid-base membranes with SPPENK-60/PEI and SPPENK-80/PEI was 1.08 mmol/g and 1.32 mmol/g

respectively.The swelling ratios of SPPENK-60/PEI and SPPENK-80/PEI is lower than those of Nafion117.These data showed that the properties of SPPENK-60/PEI and SPPENK-80/PEI membranes were more promising compared to Nafion117.Accordingly

the acid-base SPPENKs membranes for fuel cell proton exchange membrane materials hold great potential in the long perspective.