Properties improvement of SPEEK based proton exchange membranes by doping of ionic liquids and Y_2O_3  

作　　者：Jianbin Chen a,Qiang Guo a,Dan Li a,Juying Tong a,b,Xia Li a a School of Materials Science and Engineering,Shanghai University,Shanghai 201800,China b School of Wenling,Zhejiang TV University,Wenling 317500,China 

出　　处：《Progress in Natural Science:Materials International》2012年第1期26-30,共5页自然科学进展·国际材料（英文版）

基　　金：the National Natural Science Foundation of China (No. 50975167);Postgraduate Innovation Fund of Shanghai University (No. SHUCX112229);Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20113108110015)

摘　　要：The membranes of sulfonated poly(etheretherketone) with 65% sulfonation degree were prepared by doping of Y2O3 and ionic liquids,such as 1-ethyl-3-methylimidazole tetrafluoroborate(EB) or 1-butyl-3-methylimidazole methanesulfonate(BS),respectively.And the properties,including conductivities,water uptake,thermal stability and mechanical properties,of pure SPEEK based proton exchange membrane and SPEEK based proton exchange membranes by doping of ionic liquids and Y2O3 have been studied in the present investigation.The experimental results showed that the conductivity of membranes increased with the temperature increased from 30 to 90 1C,except for that of pure SPEEK membrane increased with increasing temperature from 30 to 70 1C and decreased with increasing temperature from 70 to 90 1C.The conductivities of SPEEK/EB/Y2O3 and SPEEK/BS/Y2O3 composite membranes at 90 1C were 9.04 10 2 S cm 1 and 1.18 10 1 S cm 1 at 100% relative humidity(RH) and 8.04 10 2 S cm 1 and 1.02 10 1 S cm 1 at 50%RH,respectively.It has been also found that the water uptake and thermal stability of the membranes slightly improved by doping of ionic liquids and Y2O3.The tensile stress at break at room temperature was 2.61 MPa and 2.33 MPa,for SPEEK/EB/Y2O3 and SPEEK/BS/Y2O3,respectively.Therefore it may be considered that the modification with ionic liquids and Y2O3 is a good potential method for improving the properties of SPEEK proton exchange membrane.The membranes of sulfonated poly(etheretherketone) with 65% sulfonation degree were prepared by doping of Y2O3 and ionic liquids,such as 1-ethyl-3-methylimidazole tetrafluoroborate(EB) or 1-butyl-3-methylimidazole methanesulfonate(BS),respectively.And the properties,including conductivities,water uptake,thermal stability and mechanical properties,of pure SPEEK based proton exchange membrane and SPEEK based proton exchange membranes by doping of ionic liquids and Y2O3 have been studied in the present investigation.The experimental results showed that the conductivity of membranes increased with the temperature increased from 30 to 90 1C,except for that of pure SPEEK membrane increased with increasing temperature from 30 to 70 1C and decreased with increasing temperature from 70 to 90 1C.The conductivities of SPEEK/EB/Y2O3 and SPEEK/BS/Y2O3 composite membranes at 90 1C were 9.04 10 2 S cm 1 and 1.18 10 1 S cm 1 at 100% relative humidity(RH) and 8.04 10 2 S cm 1 and 1.02 10 1 S cm 1 at 50%RH,respectively.It has been also found that the water uptake and thermal stability of the membranes slightly improved by doping of ionic liquids and Y2O3.The tensile stress at break at room temperature was 2.61 MPa and 2.33 MPa,for SPEEK/EB/Y2O3 and SPEEK/BS/Y2O3,respectively.Therefore it may be considered that the modification with ionic liquids and Y2O3 is a good potential method for improving the properties of SPEEK proton exchange membrane.

关 键 词：SPEEK PROTON exchange membrane IONIC liquids CONDUCTIVITY 

分 类 号：O614.322[理学—无机化学] TB383.2[理学—化学]