Effect of acidification treatment and morphological stability of sulfonated poly(arylene ether sulfone) copolymer proton‐exchange membranes for fuel‐cell use above 100 °C

Journal of Polymer Science, Part B: Polymer Physics - Tập 41 Số 22 - Trang 2816-2828 - 2003
Yu Seung Kim1, Feng Wang1, Michael A. Hickner1, Stephan Mccartney1, Young Taik Hong1, William Harrison1, Thomas A. Zawodzinski2, James E. McGrath1
1Department of Chemistry and Materials Research Institute, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
2MST-11: Electronic Materials and Devices, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Tóm tắt

AbstractDirectly copolymerized wholly aromatic sulfonated poly(arylene ether sulfone) copolymers derived from 4,4′‐biphenol, 4,4′‐dichlorodiphenyl sulfone, 3,3′‐disulfonated, and 4,4′‐dichlorodiphenyl sulfone (BPSH) were evaluated as proton‐exchange membranes for elevated temperature operation (100–140 °C). Acidification of the copolymer from the sulfonated form after the nucleophilic step (condensation) copolymerization involved either immersing the solvent‐cast membrane in sulfuric acid at 30 °C for 24 h and washing with water at 30 °C for 24 h (method 1) or immersion in sulfuric acid at 100 °C for 2 h followed by similar water treatment at 100 °C for 2 h (method 2). The fully hydrated BPSH membranes treated by method 2 exhibited higher proton conductivity, greater water absorption, and less temperature dependence on proton conductivity as compared with the membranes acidified at 30 °C. In contrast, the conductivity and water absorption of a control perfluorosulfonic acid copolymer (Nafion 1135) were invariant with treatment temperature; however, the conductivity of the Nafion membranes at elevated temperature was strongly dependent on heating rate or temperature. Tapping‐mode atomic force microscope results demonstrated that all of the membranes exposed to high‐temperature conditions underwent an irreversible change of the ionic domain microstructure, the extent of which depended on the concentration of sulfonic acid sites in the BPSH system. The effect of aging membranes based on BPSH and Nafion at elevated temperature on proton conductivity is also discussed. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 2816–2828, 2003

Từ khóa


Tài liệu tham khảo

Savadogo O., 1998, J New Mater Electochem Syst, 1, 47

10.1016/S0376-7388(00)00635-9

10.1016/S0378-7753(01)00812-6

Leung L., 1987, Polym Commun, 28, 20

Schneller S.;Ritter H.;Ledjeff K.;Nolte R.;Thorwirth T.EP 0574791 A2 1993.

10.1016/S0376-7388(00)00345-8

Gunduz N., 2000, Polym Prepr (Am Chem Soc Div Polym Chem), 41, 1565

Hong Y. T., 2002, Polym Prepr (Am Chem Soc Div Polym Chem), 43, 666

10.1016/S0032-3861(00)00384-0

Wang F., 2000, Polym Prepr (Am Chem Soc Div Polym Chem), 40, 180

10.1002/pol.1984.170220320

10.1016/0376-7388(93)85268-2

10.1016/S0376-7388(01)00620-2

10.1002/1521-3900(200110)175:1<387::AID-MASY387>3.0.CO;2-1

Harrison W., J Polym Sci Part A: Polym Chem

10.1016/S0376-7388(02)00507-0

Kim Y. S.;Wang F.;Hickner M.;Hong Y. T.;Zawodzinski T. A.;McGrath J. E.8th International Symposium on Polymer Electrolytes May 19–24 Santa Fe 2002.

10.1149/1.2056194

10.1016/S0376-7388(00)00632-3

Bauer B., 2000, J New Mater Electochem Syst, 3, 93

pKadatabase 4.0 by Advanced Chemistry Development Inc. (Toronto) http://www.acdlabs.com/products/phys_chem_lab/pKa.

10.1016/S0360-3199(97)00113-4

10.1149/1.1393417

10.1016/S0167-2738(01)00912-2

10.1016/0013-4686(94)E0051-Z

10.1149/1.2220749

10.1149/1.1393354

Moore R. B., 1998, Macromolecules, 21, 1234

10.1021/la000332h

Kim Y. S., 2003, Polymer

10.1149/1.1445431

Costamagna P., 2002, Electrochim Acta, 47, 103

Thông tin
Thông tin xuất bản

Journal of Polymer Science, Part B: Polymer Physics

Tập 41 Số 22

2816-2828

Thông tin tác giả