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|Title:||Proton-sweeping role of oligomeric electrolyte chains grown on silica nanospheres|
|Source:||Xinhui, Z.,Liang, H.,Zhaolin, L. (2006). Proton-sweeping role of oligomeric electrolyte chains grown on silica nanospheres. Materials Research Society Symposium Proceedings 923 : 7-12. ScholarBank@NUS Repository.|
|Abstract:||Oligomeric ionmer-grafted silica nanoparticles were synthesized via atom transfer radical polymerization (ATRP) and applied to dope Nafion to investigate proton-sweeping effect of these hybrid nanoparticles. Two types of vinyl monomers, sulfopropyl acrylate, potassium (SPA) and N,N′-methyl-(6- hexylcarbamatoethylmethacrylate) imidazolonium bromide (EMACI), were employed to construct the grafted ionmer chains. The ionmer-grafted silica particles present a thick polymer layer surrounding the SiO2 core according to TEM investigation. The DSC analysis shows that the grafted ionmer oligomers (DP̄ < 10) exhibit a stronger ionic attractive interaction than the corresponding long chain counterparts. The other structural characterizations of the ionmer-grafted SiO2 nanoparticles also include FT-IR and EDX. The most interesting feature of the grafted ionmer shrub lies in its proton-conduction enhancing effect when combined with Nafion® polymer. A series of such composite membranes were prepared through dispersing the ionmer-grafted SiO2 nanoparticles in Nafion solution and followed by casting. The grafted copolymer (SPA-co-EMACI) demonstrated a greater promoting effect on proton conduction than its homopolymer counterparts of either (SPA) or (EMACI) in the matrix of Nafion. This outcome could be attributed to the adjacent proton-sweeping effect of the pendant imidazolonium group. © 2006 Materials Research Society.|
|Source Title:||Materials Research Society Symposium Proceedings|
|Appears in Collections:||Staff Publications|
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