SEARCH Articles Figures Tables Acylium Cations in the Synthesis of Poly(arylether Ketone)s Poli s Poly ketone Poly(Ether Ketone)s (PEKs) Poly(aryl ether ketone)s Poly(arylene Ether Ketone)s Sulfonated Poly(Arylene Ether Ketone)s in DMFC