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Radiolytical Preparation of a Poly(Vinylbenzyl Sulfonic Acid)-Grafted FEP Membrane and Characterization as Polymer Electrolytes for Direct Methanol Fuel Cells

Abstract

In this study, a novel polymer electrolyte membrane, poly(vinylbenzyl sulfonic acid)-grafted poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP-g-PVBSA), has been successfully prepared by simultaneous irradiation grafting of vinylbenzyl chloride(VBC) monomer onto a FEP film and taking subsequent chemical modification steps to modify the benzyl chloride moiety to the benzyl sulfonic acid moiety. The chemical reactions for the sulfonation were carried out via the formation of thiouronium salt with thiourea, base-catalyzed hydrolysis for the formation of thiol, and oxidation with hydrogen peroxide. Each chemical conversion process was confirmed by FTIR, elemental analysis, and SEM-EDX. A chemical stability study performed with Fenton's reagent (3% H{sub 2}O{sub 2} solution containing 4 ppm of Fe{sup 2+}) at 70 deg. C revealed that FEP-g-PVBSA has a higher chemical stability than the poly(styrene sulfonic acid)-grafted membranes (FEP-g-PSSA). An EDX analysis was also used to observe the cross-sectional distribution behaviors of the hydrophilic sulfonic acid groups and hydrophobic fluorine groups. The characteristics of an ion-exchange capacity (IEC), water and methanol uptake, methanol permeability, and proton conductivity as a function of the degree of grafting were also studied. The IECs and water uptakes of membranes with different degrees of grafting (36-102%) were measured to be in the range of 0.8-1.62 meq/g, and 10-30%,  More>>
Authors:
Nho, Y -C; Shin, J; Sohn, J -Y; Fei, G [1] 
  1. Radiation Research Division for Industry and Environment, Korea Atomic Energy Research Institute, 1266 Sinjeong-dong, Jeongeup-si, Jeollabuk-do 580-185 (Korea, Republic of)
Publication Date:
Sep 15, 2012
Product Type:
Book
Resource Relation:
Other Information: 20 figs, 1 tab, 43 refs; Related Information: In: Development of Novel Adsorbents and Membranes by Radiation-induced Grafting for Selective Separation in Environmental and Industrial Applications| 290 p.
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY; CHLORIDES; DIRECT METHANOL FUEL CELLS; FLUORINE; FOURIER TRANSFORMATION; HYDROGEN PEROXIDE; HYDROLYSIS; INFRARED SPECTRA; MEMBRANES; METHANOL; OXIDATION; PERMEABILITY; POLYMERS; PROTON CONDUCTIVITY; SCANNING ELECTRON MICROSCOPY; STABILITY; STYRENE; SULFONATION; SULFONIC ACIDS; THIOLS; UPTAKE
Sponsoring Organizations:
Ministry of Education, Science, and Technology, Korea Science and Engineering, R and D Program (Korea, Republic of)
OSTI ID:
22012228
Research Organizations:
International Atomic Energy Agency, Industrial Applications and Chemistry Section, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 2225-8833; ISBN 978-92-0-134010-8; TRN: XA12N1788099329
Availability:
Also available on-line: http://www-pub.iaea.org/MTCD/Publications/PDF/P1572_web.pdf; Enquiries should be addressed to IAEA, Marketing and Sales Unit, Publishing Section, E-mail: sales.publications@iaea.org; Web site: http://www.iaea.org/books
Submitting Site:
INIS
Size:
page(s) 132-151
Announcement Date:
Jan 03, 2013

Citation Formats

Nho, Y -C, Shin, J, Sohn, J -Y, and Fei, G. Radiolytical Preparation of a Poly(Vinylbenzyl Sulfonic Acid)-Grafted FEP Membrane and Characterization as Polymer Electrolytes for Direct Methanol Fuel Cells. IAEA: N. p., 2012. Web.
Nho, Y -C, Shin, J, Sohn, J -Y, & Fei, G. Radiolytical Preparation of a Poly(Vinylbenzyl Sulfonic Acid)-Grafted FEP Membrane and Characterization as Polymer Electrolytes for Direct Methanol Fuel Cells. IAEA.
Nho, Y -C, Shin, J, Sohn, J -Y, and Fei, G. 2012. "Radiolytical Preparation of a Poly(Vinylbenzyl Sulfonic Acid)-Grafted FEP Membrane and Characterization as Polymer Electrolytes for Direct Methanol Fuel Cells." IAEA.
@misc{etde_22012228,
title = {Radiolytical Preparation of a Poly(Vinylbenzyl Sulfonic Acid)-Grafted FEP Membrane and Characterization as Polymer Electrolytes for Direct Methanol Fuel Cells}
author = {Nho, Y -C, Shin, J, Sohn, J -Y, and Fei, G}
abstractNote = {In this study, a novel polymer electrolyte membrane, poly(vinylbenzyl sulfonic acid)-grafted poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP-g-PVBSA), has been successfully prepared by simultaneous irradiation grafting of vinylbenzyl chloride(VBC) monomer onto a FEP film and taking subsequent chemical modification steps to modify the benzyl chloride moiety to the benzyl sulfonic acid moiety. The chemical reactions for the sulfonation were carried out via the formation of thiouronium salt with thiourea, base-catalyzed hydrolysis for the formation of thiol, and oxidation with hydrogen peroxide. Each chemical conversion process was confirmed by FTIR, elemental analysis, and SEM-EDX. A chemical stability study performed with Fenton's reagent (3% H{sub 2}O{sub 2} solution containing 4 ppm of Fe{sup 2+}) at 70 deg. C revealed that FEP-g-PVBSA has a higher chemical stability than the poly(styrene sulfonic acid)-grafted membranes (FEP-g-PSSA). An EDX analysis was also used to observe the cross-sectional distribution behaviors of the hydrophilic sulfonic acid groups and hydrophobic fluorine groups. The characteristics of an ion-exchange capacity (IEC), water and methanol uptake, methanol permeability, and proton conductivity as a function of the degree of grafting were also studied. The IECs and water uptakes of membranes with different degrees of grafting (36-102%) were measured to be in the range of 0.8-1.62 meq/g, and 10-30%, respectively. When the degree of grafting reached 60% the proton conductivity was higher than that of a Nafion (registered) 212 membrane (6.1E-02 S/cm). The methanol permeability and uptake of the FEP-g-PVBSA membrane was significantly lower than that of the Nafion (registered) 212 membrane, and even the degree of grafting reached 102%. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}