Alkali metal ion conductors based on sulfonated poly(<i>p</i>‐phenylene terephthalamide)

Foo, Conrad; Kwei, T. K.; Okamoto, Y.; McBreen, J.; Lee, H. S.

doi:10.1002/pola.1994.080321602

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…The competition between them often causes complicated structures, which are related to not only the local structural formation along the polyelectrolyte chain , but also the self-assembly among the polyelectrolyte chains. On the other hand, some well-ordered structures were observed for a rigid polyelectrolyte. − We think that this unique behavior of a rigid polyelectrolyte is the key to elucidate the hidden mechanism of spontaneous self-assembly to form well-ordered structures in living organisms.…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembling Structure in Solution of a Semirigid Polyelectrolyte

et al. 2008

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We investigated the self-assembling structure in aqueous solution of polyelectrolyte poly(2,2′disulfonyl-4,4′-benzidine terephthalamide) (PBDT), which has a rigid chemical structure of polyaramide in the main chain. It is found that PBDT exhibits a stretched semirigid conformation in solution, regardless of PBDT concentration, C P , or salt addition. PBDT in water exhibits both a very low overlap concentration, C*, and a lower critical concentration of nematic liquid crystal, C LC *. In the intermediate region of C* < C P < C LC *, PBDT forms cluster-like isotropic self-assembly. Moreover, in the intermediate region of C* < C P < C LC *, the addition of NaCl induces the alternation of structure from a cluster-like isotropic self-assembly to a fiber-like anisotropic one. Further addition of NaCl induces a network-like huge self-assembling structure, as the stoichiometric molar ratio of [NaCl] to [NaSO 3 -] increases beyond 1. The semirigid polyelectrolyte probably has hidden potential for structural polymorphism in aqueous solutions in the presence of salt.

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Section: Introductionmentioning

confidence: 99%

“…On the other hand, some well-ordered structures were observed for a rigid polyelectrolyte. [9][10][11][12][13][14][15][16][17][18][19] We think that this unique behavior of a rigid polyelectrolyte is the key to elucidate the hidden mechanism of spontaneous self-assembly to form well-ordered structures in living organisms.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembling Structure in Solution of a Semirigid Polyelectrolyte

et al. 2008

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Synthesis of sulfonated aromatic poly(ether amide)s and their application to proton exchange membrane fuel cells

Ozawa

Eagar

et al. 2008

J. Polym. Sci. A Polym. Chem.

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A series of wholly aromatic sulfonated poly(ether amide)s (SPEAs) containing a sulfonic acid group on the dicarbonyl aromatic ring were prepared via a polycondensation reaction of sulfonated terephthalic acid (STA), terephthalic acid (TA), and aromatic diamine monomers. The degree of sulfonation was readily controlled by adjusting the monomer feed ratio of STA and TA in the polymerization process, and randomly sulfonated polymers with an ion exchange capacity (IEC) of 1.0–1.8 mequiv/g were prepared using this protocol. The chemical structures of randomly sulfonated polymers were characterized using NMR and FT‐IR spectroscopies. Gel permeation chromatography analysis of SPEAs indicated the formation of high‐molecular‐weight sulfonated polymer. Tough and flexible SPEA membranes were obtained from solution of N,N‐dimethylacetamide, and thermogravimetric analysis of these membranes showed a high degree of thermal stability. Compared with previously reported sulfonated aromatic polyamides, these new SPEAs showed a significantly lower water uptake of 10–30%. In proton conductivity measurements, ODA‐SPEA‐70 (IEC = 1.80 mequiv/g), which was obtained from polycondensation of 4,4′‐oxydianiline and 70 mol % STA, showed a comparable proton conductivity (105 mS/cm) to that of Nafion 117 at 80 °C. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 485–496, 2009

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Cylindrical Micelles of Wormlike Polyelectrolytes

1999

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We report on a study of the association behavior in solution of semirigid polymers consisting of a poly(p-phenylene) backbone with alternation of negatively charged and hydrophobic moieties. Small-angle X-ray scattering data of aqueous solutions of sulfonated poly(p-phenylene)s show aggregated polymer chains in the form of cylindrical micelles, in which the phenylene backbone is oriented parallel to the long axis of the micelle. The charge density and the length of the alkyl side chains influence the diameter and aggregation number of the micelles. Micelles with strand aggregation numbers between 3 and 11 are formed depending on the hydrophobic−hydrophilic balance. The observed behavior resembles the formation of supermolecular structures by biogenic semirigid polyelectrolytes.

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Alkali metal ion conductors based on sulfonated poly(p‐phenylene terephthalamide)

Cited by 3 publications

References 12 publications

Self-Assembling Structure in Solution of a Semirigid Polyelectrolyte

Self-Assembling Structure in Solution of a Semirigid Polyelectrolyte

Synthesis of sulfonated aromatic poly(ether amide)s and their application to proton exchange membrane fuel cells

Cylindrical Micelles of Wormlike Polyelectrolytes

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