Premium
Preparation of novel sulfonated block copolyimides for proton conductivity membranes
Author(s) -
Nakano Takahiko,
Nagaoka Shoji,
Kawakami Hiroyoshi
Publication year - 2005
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.650
Subject(s) - membrane , conductivity , materials science , dielectric spectroscopy , block (permutation group theory) , proton , diamine , nafion , polymer chemistry , relative humidity , electrochemistry , chemical engineering , analytical chemistry (journal) , chemistry , chromatography , electrode , thermodynamics , biochemistry , physics , geometry , mathematics , engineering , quantum mechanics
In this article novel sulfonated block copolyimides with various diamine compositions and block chain lengths were synthesized by chemical imidization using a two‐pot procedure. The proton conductivities of the block copolyimide membranes were measured as functions of the relative humidity and temperature using four‐point‐probe electrochemical impedance spectroscopy. The proton conductivity of the membranes strongly depended on the block chain lengths and increased with an increase in the block chain lengths. The proton conductivity of NTDA‐BDSA‐b‐6FAP (112/48) as the block copolyimide membrane was approximately 0.35 S cm −1 which indicated a higher value when compared to that determined for Nafion®. Copyright © 2005 John Wiley & Sons, Ltd.