Dissertation > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Heterocyclic compounds > Containing five pairs or more different atoms of heterocyclic > Between the two nitrogen -mao ( imidazole) and its derivatives

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

Author CheQuanTong
Tutor HeRongHuan
School Northeastern University
Course Physical and chemical
Keywords High temperature proton exchange membrane Ionic liquid composite film Conductivity Mechanical behavior Crosslinking agent
CLC O626.23
Type Master's thesis
Year 2008
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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 .

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