| Summary: | 碩士 === 國立中山大學 === 光電工程學系研究所 === 99 === Three aromatic poly(arylene ether)s P2、P3、P4 were synthesized from bis(fluoride)4,4””-Difluoro-3,3””-bsi-trifluoromethyl-n”-bisphenyl-[1,1’;4’,1”;4”,1”’;4”’,1””]-quinquephenyl(n”:2”,3”[G2];2”,3”,5”[G3];2”,3”,5”,6”[G4]) with 4,4''-(9-Fluorenylidene)diphenol. The molecular weight of the polymer (Mw: 105-1.6×105, PDI:1.5-2.2) was measured by gel permeation chromatography and the structure was confirmed by NMR spectra. Thermal stability was measured using Thermogravimetry and Thermomechanical Analysis. The polymer had a Td at 520℃ ~550℃, and soft point at 310℃. Young''s modulus of polymer was (1.25-2.5Gpa). This polymer has high strength, modulus of elasticity, and thermal stability. The polymer consists of polyaromatic groups with bisfluoride monomer, (5, 6, 7 aromatic). We hypothesized that sulfonation of the polymer will exhibit high conductivity and great mechanical properties. Ion exchange capacities (IECs) were evaluated by acid–base titration. We sulfonated the polymer in order to apply to the proton exchange membrane fuel cell. The results showed after sulfonation of P4, IEC is 3.3(meq/g), and sulfonation of P2 showed that its proton conductivity is 75% more than Nafion117 at 80℃ with 0.28(S/cm).
Keywords: proton exchange membrane, proton conductivity, Nafion, sulfonated, ion exchange capacity
|
|---|
