Preparation and Characterization on Ionic Liquid 1-Buty-3-Methylimidazolium Hexafluorophosphate and the New Anhydrous Conducting Membranes Based on Polymers of Sulfonated Poly (Ether Ether) Ketone and Polyvinylidenefluoride
|Course||Physical and chemical|
|Keywords||High temperature proton exchange membrane Ionic liquid composite film Conductivity Mechanical behavior Crosslinking agent|
Proton exchange membrane (PEM) is a core component of the proton exchange membrane fuel cell (PEMFC) , such as the low temperature PEM : low conductivity water and heat management problems , the catalyst Pt vulnerable to CO poisoning and other technical issues , development in above 110 ℃ high temperature PEM has become a hot research field . Ionic liquids due to the advantages of having a low melting point , high electrical conductivity and good thermal stability, etc. , to be ideal for the development of high temperature PEM electrolyte . In this study, N-methyl imidazole, chlorobutane and hexafluorophosphate as the raw syngas room temperature ionic liquid 1 - butyl - 3 - methylimidazo the hexafluorophosphate ( BMIMPF6 ) . By a solution casting method , the BMIMPF6 respectively sulfonated polyetheretherketone (SPEEK) and poly vinylidene fluoride (PVDF) and composite film . By soaking method and prepared BMIMPF6/Nafion composite membrane . Research BMIMPF6 composite membrane BMIMPF6/SPEEK BMIMPF6/PVDF and BMIMPF6/Nafion conductivity and room temperature under anhydrous conditions in more than 110 ℃ , 25 ℃ and 110 ° C , 130 ° C high temperature mechanical performance . At 240 ℃ , BMIMPF6 the conductivity is 0.118 S / cm ; without humidification conditions at 200 ℃ BMIMPF6/Nafion composite membrane conductivity 0.0030 S / cm ; in 160 ℃ , BMIMPF6 of mass fraction of 60 % BMIMPF6/PVDF composite membrane conductivity was 0.023 S / cm. in BMIMPF6 mass fraction of 40%, the degree of sulfonation is a 70% BMIMPF6/SPEEK composite film were added trifluoromethane sulfonic acid (TFMSA) and the porous substance SiO2- P2O5 , the composite membrane conductivity increased by 0.0015 S / cm to 0.0136 S / cm and 0.0051 S / cm in the same conditions of temperature and ionic liquid mass fraction BMIMPF6/PVDF of mechanical properties superior to the mechanical performance of the BMIMPF6/SPEEK . When the mass fraction of the BMIMPF6 are 40% at 130 ℃ BMIMPF6/PVDF the maximum tensile strength was 3.7 MPa , and the degree of sulfonation of 45% BMIMPF6/SPEEK maximum tensile strength as compared to 0.45 MPa . BMIMPF6/SPEEK mechanical performance by glycerol and ethylene glycol increased SPEEK crosslinked . The study tested the of composite membrane ionic liquid mass fraction and temperature changes on the mechanical properties of composite film .