Poly(styrene-co-acrylonitrile) based proton conductive membranes

Silva, Adney L.A.; Takase, Iracema; Pereira, Robson Pacheco; Rocco, Ana Maria

doi:10.1016/j.eurpolymj.2008.02.025

Cited by 33 publications

(27 citation statements)

References 48 publications

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“…Considering the deviations, the membranes exhibit a mean conductivity of approximately (2.05±0.26)×10 -5 S.cm -1 at 80 °C. These values, even inferior to others described in the literature, can be optimized by structural (chemical) modifications in the system, such as sulfonation [14] . The temperature dependence of conductivity was studied using the Arrhenius model, and is represented in Figure 6.…”

Section: Proton Conductivitymentioning

confidence: 71%

Proton conductive membranes based on poly(styrene-co-allyl alcohol) Semi-IPN

Loureiro¹,

Marins²,

Anjos³

et al. 2014

Polímeros

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Abstract:The optimization of fuel cell materials, particularly polymer membranes, for PEMFC has driven the development of methods and alternatives to achieve systems with more adequate properties to this application. The sulfonation of poly(styrene-co-allyl alcohol) (PSAA), using sulfonating agent:styrene ratios of 2:1, 1:1, 1:2, 1:4, 1:6, 1:8 and 1:10, was previously performed to obtain proton conductive polymer membranes. Most of those membranes exhibited solubility in water with increasing temperature and showed conductivity of approximately 10 -5 S cm -1. In order to optimize the PSAA properties, especially decreasing its solubility, semi-IPN (SIPN) membranes are proposed in the present study. These membranes were obtained from the diglycidyl ether of bisphenol A (DGEBA), curing reactions in presence of DDS (4,4-diaminodiphenyl sulfone) and PSAA. Different DGEBA/PSAA weight ratios were employed, varying the PSAA concentration between 9 and 50% and keeping the mass ratio of DGEBA:DDS as 1:1. The samples were characterized by FTIR and by electrochemical impedance spectroscopy. Unperturbed bands of PSAA were observed in the FTIR spectra of membranes, suggesting that chemical integrity of the polymer is maintained during the synthesis. In particular, bands involving C-C stretching (1450 cm -1 ), C=C (aromatic, ~ 3030 cm .

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Section: Proton Conductivitymentioning

confidence: 71%

Proton conductive membranes based on poly(styrene-co-allyl alcohol) Semi-IPN

Loureiro¹,

Marins²,

Anjos³

et al. 2014

Polímeros

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“…Another set of membranes with the same composition were sulfonated in order to obtain the SIPN 47 -SO 3 H membranes, using different sulfonating ratios 1:4, 1:2, 1:1 and 2:1, according to the experimental procedures described in a previous work (6).…”

Section: Materials and Samples Preparationmentioning

confidence: 99%

Polyethyleneimine-Based Semi-Interpenetrating Network Membranes for Fuel Cells

Loureiro¹,

Pereira²,

Rocco³

2013

ECS Trans.

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In the present work, Semi-interpenetrating polymer networks (SIPN) based on polyethyleneimine (PEI) were synthesized and characterized, aiming their future application in fuel cell devices. The membranes were acidified by two methods: (i) absorption of H 3 PO 4 from aqueous solutions and (ii) sulfonation, forming covalently bonded -SO 3 H. The thermal stability exhibited by the SIPN membranes, above 270 o C, is sufficient for their application in PEMFC and the membranes doped with H 3 PO 4 at 20% show higher conductivity values (of about 0.08 Ω -1 cm -1 ) than those obtained for the best sulfonated sample (10 -3 Ω -1 cm -1 ).

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“…However in some combinations (with cellulose acetate, or butadiene) SAN copolymer have been proven as useful membrane material (in dialysis, ultrafiltration, enzyme-immobilization, molecular imprinting and pervaporation) (Joshi et al, 2001;Fritzsche, 1986;Radha et al, 2009Radha et al, , 2014Silva et al, 2008;Murthy et al, 2012). From the best of our knowledge SAN was not yet exploited in electrodialysis, despite its optimal profile in terms of chemical resistance, thermal resistance, high strength, dimensional stability, processability and durability (Murthy et al, 2012).…”

Section: Introductionmentioning

confidence: 96%