By courtesy of:
R. Scott McLean,* Marc Doyle, and Bryan B. Sauer
Macromolecules 2000, 33, 6541
and for both Nafion and Dow polymers:
A Fluorescent Probe Investigation of the Origin of Superselectivity in Perfluorinated Ionomer Membranes
M. A. F. Robertson and H. L. Yeager*
Macromolecules 1996, 29, 5166
and only for Dow polymer:
Small-Angle Scattering Study of Short Pendant Chain Perfuorosulfonated Ionomer Membranes
Gerard Gebel*, Robert B. Moore
Macromolecules 2000, 33, 4850
and an old paper about Nafion:
Physical Properties and Supermolecular Structure of Perfluorinated Ion-Containing (Nafion) Polymers
SWEE CHYE YEO* and A. EISENBERG
JOURNAL OF APPLIED POLYMER SCIENCE VOL. 21, 875-898 (1977)