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Synthesis and Characterization of Phosphonated Graphene Oxide and Sulfonated Poly(styrene-isobutylene-styrene) Composite Membranes

Published online by Cambridge University Press:  16 May 2018

Eduardo Ruiz-Colón  and
David Suleiman
Eduardo Ruiz-Colón*
Affiliation:
Chemical Engineering Dept., University of Puerto Rico, Mayagüez, PR 00681-9000
David Suleiman
Affiliation:
Chemical Engineering Dept., University of Puerto Rico, Mayagüez, PR 00681-9000
*
*(Email: eduardo.ruiz@upr.edu)
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Abstract

Graphene oxide (GO) and its phosphonated analogue (pGO) have been incorporated into sulfonated poly(styrene-isobutylene-styrene) (SO3H SIBS) to generate membranes with enhanced water retention. The polymer nanocomposite membranes (PNMs) were prepared per SIBS sulfonation level (i.e., 38, 61, and 90 mole %), filler type (i.e., GO and pGO) and filler loading (i.e., 0.1, 0.5 and 1.0 wt.%). FT-IR and TGA confirmed the functionalization and incorporation of the fillers into SO3H SIBS. No significant changes were observed in the thermal stability or FTIR spectra of the PNMs after addition of the fillers. Dissimilar behaviors were observed for the water absorption capabilities (i.e., swelling ratio and water uptake) after incorporation of the fillers. The nanofillers enhanced the water absorption of the sulfonated polymer, possibly due to interconnections between the ionic groups. Therefore, the PNMs could not only potentially function as proton exchange membranes (PEMs) for several applications such as direct methanol fuel cells (DMFCs).

Keywords

graphenemembranewatercompositepolymer
Type
Articles
Information
MRS Advances , Volume 3 , Issue 47-48: Nanomaterials , 2018 , pp. 2905 - 2912
Copyright
Copyright © Materials Research Society 2018 

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