Author/Authors :
Dae-Sik Kim، نويسنده , , Hyun Il Cho، نويسنده , , Dae Hoon Kim، نويسنده , , Byung Seong Lee، نويسنده , , Bo Sung Lee، نويسنده , , Suk Won Yoon، نويسنده , , Yu Seung Kim، نويسنده , , Go Young Moon، نويسنده , , Hongsik Byun، نويسنده , , Ji Won Rhim، نويسنده ,
Abstract :
Surface fluorination effectively reduced the water absorption of crosslinked polyvinyl alcohol (PVA)/poly(styrene sulfonic acid-co-maleic acid) (PSSA_MA) membranes. The crosslinked PVA membranes were prepared using PSSA_MA as a crosslinking agent as well as a donor of the hydrophilic group (–SO3H and/or –COOH). Surface treatment by gaseous fluorine treatment disrupted the C–OH bonds and generated C–F and C–F2 groups at the membrane surface where atomic percent of fluorine increased up to 5.4%. The membranes with highly hydrophobic fluorinated surface exhibited improved proton conductivity and methanol permeability at a relatively low water uptake.
Keywords :
Direct fluorination , Poly(styrene sulfonic acid-co-maleic acid) , Crosslinked poly(vinyl alcohol) membranes , Methanol permeability , Proton conductivity