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Sulfonated poly(ether ketone)s containing 3,5-dimethyl phthalazinone moieties(SPPEK-DMs)with different degrees of sulfonation(DS)were synthesized via direct polycondensation from 4-(3,5-dimethyl-4-hydroxyphenyl)-2,3- phthalazinone,4,4’-difluorobenzophenone and 3,3’-disulfonate-4,4’-difluorobenzophenone.The chemical structure of SPPEK-DMs was characterized by FTIR and ~1H-NMR.Thermal stability of SPPEK-DMs was characterized by the thermogravimetric analysis.The membranes prepared from SPPEK-DMs exhibited ion exchange capacities(IEC)ranging from 0.93 mmol·g~(-1)to 1.86 mmol·g~(-1).Water uptake,swelling,oxidative stability and methanol permeability of SPPEKDMs membranes were investigated.SPPEK-DMs membranes exhibited high oxidative stability.The methanol permeability values of SPPEK-DMs membranes were in the ranee 5.15×10~(-8)-6.61×10~(-7)cm s,which was much lower than those of Nafionl 17.The proton conductivity of SPPEK-DM40 membranes was 1.1×10~(-2)Scm~(-1)at 70℃.
Sulfonated poly (ether ketone) s containing 3,5-dimethyl phthalazinone moieties (SPPEK-DMs) with different degrees of sulfonation (DS) were synthesized by direct polycondensation from 4- (3,5-dimethyl- 3-phthalazinone, 4,4’-difluorobenzophenone and 3,3’-disulfonate-4,4’-difluorobenzophenone.The chemical structure of SPPEK-DMs was characterized by FTIR and ~ 1H-NMR.Thermal stability of SPPEK-DMs was characterized The thermogravimetric analysis.The membranes were prepared from SPPEK-DMs exhibited ion exchange capacities (IEC) ranging from 0.93 mmol · g -1 to 1.86 mmol · g -1 .Water uptake, swelling, oxidative stability and methanol permeability of SPPEKDMs membranes were investigated. SPPEK-DMs membranes were high oxidative stability. The methanol permeability values of SPPEK-DMs membranes were in the ranee 5.15 × 10 ~ (-8) -6.61 × 10 ~ (-7) cm s, which was much lower than those of Nafion 1 17. The proton conductivity of SPPEK-DM40 membranes was 1.1 × 10 -2 Scm -1 at 70 ° C.