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Effect of Branching-agent Content on the Electrochemical Properties of Partially Fluorinated Poly(Arylene Ether Sulfone) Block Ionomer Membranes  

Jeon, Seong-Hoon (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Chang, Bong-Jun (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Kang, Ho-Cheol (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Kim, Jeong-Hoon (Environment & Resources Research Center, Korea Research Institute of Chemical Technology)
Joo, Hyeok-Jong (Department of Polymer Engineering, Chungnam National University)
Publication Information
Membrane Journal / v.21, no.1, 2011 , pp. 1-12 More about this Journal
Abstract
Partially fluorinated poly(arylene ether sulfone) block ionomer membranes with different branch degree for fuel cell applications were investigated. A sulfonable monomer, a non-sulfonable monomer and a trifunctional branching agent were synthesized and the sulfonable monomer was oligomerized to obtain block structures. The oligomer was then further polymerized with the non-sulfonable monomer and the branching agent. The mole ratio of oligomer : non-sulfonable monomer was fixed at 4:6 and the content of the branching agent was varied from 0 to 2 mol% (BBC-40Bx). Post-sulfonation of BBC-40Bx was carried out using chlorosulfonic acid (CSA) (SBBC-40Bx). All the synthesized compounds were characterized by $^1H$-NMR, $^{19}F$-NMR and FT-IR. It was confirmed that the ion exchange capacity (IEC), water uptake and ion conductivity of SBBC-40Bx increased with the increment of branching agent content.
Keywords
branched block copolymer; partially fluorinated; fuel cell membrane; sulfonated poly(arylene ether);
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