Nanostructure, Morphology, and Properties of Fluorous Copolymers Bearing Ionic Grafts

Tsang, Emily M. W.; Zhang, Zhaobin; Yang, Ami C. C.; Shi, Zhiqing; Peckham, Timothy J.; Narimani, Rasoul; Frisken, Barbara J.; Holdcroft, Steven

doi:10.1021/ma901740f

Cited by 119 publications

(150 citation statements)

References 87 publications

(186 reference statements)

Supporting

Mentioning

143

Contrasting

Order By: Relevance

“…This seems to suggest that in the context of synthesizing higher acid content graft copolymerbased PEMs, shorter graft chains present may be required as they appear to enhance the elastic forces of the matrix, thus hindering excessive swelling. [ 63 ] The μ ′ H + of 18 extrapolated to infi nite dilution ( X v = 1.0) is signifi cantly lower ( ≈ 1.7 × 10 − 3 cm 2 V − 1 s − 1 ) [ 63 ] than free protons presence of fl uorinated segments in a polymer will increase the degree of microphase separation of hydrophilic and hydrophobic domains in comparison to hydrocarbon analogues and, thus, normally lead to higher levels of proton conduction. SAXS data for the two copolymers shows that there is greater degree of order for PHMA-b -PSSA-b -PHMA than PFMA-b -PSSA-b -PFMA.…”

Section: Polystyrene-based Block and Graft Copolymersmentioning

confidence: 99%

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

2010

Self Cite

View full text Add to dashboard Cite

A fundamental understanding of structure-morphology-property relationships of proton exchange membranes (PEMs) is crucial in order to improve the cost, performance, and durability of PEM fuel cells (PEMFCs). In this context, there has been an explosion over the past five years in the volume of research carried out in the area of non-perfluorinated, proton-conducting polymer membranes, with a particular emphasis on exploiting phase behavior associated with block and graft copolymers. This progress report highlights a selection of interesting studies in the area that have appeared since 2005, which illustrate the effects of factors such as acid and water contents and morphology upon proton conduction. It concludes with an outlook on future directions.

show abstract

Section: Polystyrene-based Block and Graft Copolymersmentioning

confidence: 99%

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has been found that higher proton conductivity can be achieved if the size of the substructure is reduced or the graft chains are more homogeneously distributed as these factors allowed the membranes to retain more water under low humidity and high temperature conditions. 36,72 It is thus clear that a range of parameters linked to the morphology should be carefully considered for the development of efficient PEMs.…”

Section: Feature Articlementioning

confidence: 99%

Ion transport in sulfonated polymers

Park

Kim

2013

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

As the focus on proton exchange fuel cells continues to escalate in the era of alternative energy systems, the rational design of sulfonated polymers has emerged as a key technique for enhancing device efficiency. Although the synthesis and characterization of a wide variety of sulfonated polymers have been extensively reported over the last decade, quantitative understanding of the factors governing the ion transport properties of these materials is in its infancy. In this article, we describe the current understanding of the thermodynamics and ion transport in sulfonated polymers. Various strategies for accessing improved transport properties of sulfonated polymers are presented by focusing on their structure-property relationship. The major accomplishment of obtaining well-defined morphologies for these sulfonated polymers is highlighted as a novel means of controlling the transport properties. Recent studies on the thermodynamics, morphologies, and anhydrous transport properties of sulfonated block copolymers comprising ionic liquids, geared towards high temperature polymer electrolyte membranes as a prospective technology, are also expounded.

show abstract

“…Proton conductivity increased with increasing water uptake. The increase in proton conductivity will be due to two factors: the increase in the number and/or the effective area of proton permeable channels and the increase of proton mobility in a PEM [32,33]. will be due to two factors: the increase in the number and/or the effective area of proton permeable channels and the increase of proton mobility in a PEM [32,33].…”

Section: Water Uptake Proton Conductivity and Methanol Permeabilitymentioning

confidence: 99%

“…The increase in proton conductivity will be due to two factors: the increase in the number and/or the effective area of proton permeable channels and the increase of proton mobility in a PEM [32,33]. will be due to two factors: the increase in the number and/or the effective area of proton permeable channels and the increase of proton mobility in a PEM [32,33]. The PSF-g-PSSA PEMs prepared under conditions of c P CM = 15.3 mol % and EtSS = 2.2 mmol (SF-6) exhibited 103 mS•cm −1 of proton conductivity which is relatively lower than that of Nafion ® 117 (136 mS•cm −1 ) at 60 °C, though Nafion ® 117 has lower IEC (0.91 meq/g) than SF-6.…”

Section: Water Uptake Proton Conductivity and Methanol Permeabilitymentioning

confidence: 99%

“…SF-1 had much lower proton conductivity and methanol permeability than the other PEMs. This will be due to the fact that, in PEMs prepared from a graft copolymer, phase separation between the hydrophobic domains and the hydrophilic domains gives ionic aggregates (ionic clusters) of -SO3H inside the PEM [33]. A graft copolymer with longer Lav will give a lower density of the ionic clusters inside the PEM; hence, the number of ionic channels connected between the clusters will be lower than a PEM with shorter Lav, especially at low IEC.…”

Section: Water Uptake Proton Conductivity and Methanol Permeabilitymentioning

confidence: 99%

See 1 more Smart Citation

DMFC Performance of Polymer Electrolyte Membranes Prepared from a Graft-Copolymer Consisting of a Polysulfone Main Chain and Styrene Sulfonic Acid Side Chains

et al. 2016

View full text Add to dashboard Cite

Abstract:Polymer electrolyte membranes (PEMs) for direct methanol fuel cell (DMFC) applications were prepared from a graft-copolymer (PSF-g-PSSA) consisting of a polysulfone (PSF) main chain and poly(styrene sulfonic acid) (PSSA) side chains with various average distances between side chains (Lav) and side chain lengths (Lsc). The polymers were synthesized by grafting ethyl p-styrenesulfonate (EtSS) on macro-initiators of chloromethylated polysulfone with different contents of chloromethyl (CM) groups, and by changing EtSS content in the copolymers by using atom transfer radical polymerization (ATRP). The DMFC performance tests using membrane electrode assemblis (MEAs) with the three types of the PEMs revealed that: a PSF-g-PSSA PEM (SF-6) prepared from a graft copolymer with short average distances between side chains (Lav) and medium Lsc had higher DMFC performance than PEMs with long Lav and long Lsc or with short Lav and short Lsc. SF-6 had about two times higher PD max (68.4 mW/cm 2 ) than Nafion ® 112 at 30 wt % of methanol concentration. Furthermore, it had 58.2 mW/cm 2 of PD max at 50 wt % of methanol concentration because of it has the highest proton selectivity during DMFC operation of all the PSF-g-PSSA PEMs and Nafion ® 112.

show abstract

Nanostructure, Morphology, and Properties of Fluorous Copolymers Bearing Ionic Grafts

Cited by 119 publications

References 87 publications

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

Ion transport in sulfonated polymers

DMFC Performance of Polymer Electrolyte Membranes Prepared from a Graft-Copolymer Consisting of a Polysulfone Main Chain and Styrene Sulfonic Acid Side Chains

Contact Info

Product

Resources

About