Synthesis and properties of highly sulfonated proton conducting polyimides from bis(3-sulfopropoxy)benzidine diaminesElectronic supplementary information (ESI) available: 1H NMR spectra of BSPB diamines and IR spectra of resulting polyimide membranes. See http://www.rsc.org/suppdata/jm/b3/b313276e/
Keyword(s):
1H Nmr
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