Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2018-04-01

Journal: HIGH PERFORMANCE POLYMERS

Included Journals: EI、SCIE

Volume: 30

Issue: 3

Page Number: 274-282

ISSN: 0954-0083

Key Words: Poly(aryl ethers); PEMs; fuel cell; oxadiazole; phthalazinone

Abstract: In this work, 2,5-bis(4-fluorophenyl)-1,3,4-oxadiazole (2F-Oz) is synthesized and successfully polymerized with 4-(4-hydroxyaryl)-phthalazin-1-one (DHPZ) through polycondensation to produce poly(ether 1,3,4-oxidiazole) containing phthalazinone units (PPEO) with intrinsic viscosity 1.54 dL g(-1). A series of sulfonated poly(ether-1,3,4-oxidiazole)s (SPPEOs) with different degrees of sulfonation are prepared via postsulfonation reaction. The chemical structure of PPEO and SPPEOs was characterized through FT-IR and proton nuclear magnetic resonance, respectively. SPPEOs have excellent film-forming properties and readily dissolve in polar aprotic solvents, such as dimethyl sulfoxide, N-methyl-2-pyrrolidone (NMP), and so on. The water uptake of these SPPEO membranes with measured ion-exchange capacity of 1.13-1.61 mmol g(-1) was 15.7-34.1% at 25 degrees C and 17.9-59.8% at 60 degrees C, and swelling ratio was 5.9-14.2% at 25 degrees C and 6.6-18.1% at 60 degrees C, respectively. The proton conductivity of SPPEO-1.61 is 0.045 S cm(-1) at 30 degrees C and 0.065 S cm(-1) at 80 degrees C, and the tensile strength of the SPPEO-1.61 is 48 MPa, and its elongation at break was 21%. The thermal and chemical stability of the SPPEOs is also examined.