Molecular basis of the β-transition in poly(arylene ether sulfones)

Dumais, Joseph J.; Cholli, Ashok L.; Jelinski, Lynn W.; Hedrick, J. L.; McGrath, J. E.

doi:10.1021/ma00161a017

Cited by 65 publications

(46 citation statements)

References 7 publications

(10 reference statements)

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“…3,4 In searching for new polymer electrolytes for use in PEM fuel cells, it is a common practice to functionalize aromatic polymers with proton conducting groups. Promising candidates for an alternative hightemperature and low-humidity PEMs are derived from poly͑arylene ether sulfone͒s, 5 well-known engineering thermoplastic materials ͑particularly when devoid of aliphatic units͒ that display excellent thermal and mechanical properties. Sulfonated poly͑arylene ether sulfone͒s are synthesized by attaching sulfonic acid groups in polymer modification reactions ͑postsulfonation route͒ and have been investigated since the pioneering work of Noshay and Robeson, 6 who developed a mild sulfonation procedure for the commercially available bisphenol-A-based-poly͑ether sulfone͒.…”

mentioning

confidence: 99%

Durability of Perfluorosulfonic Acid and Hydrocarbon Membranes: Effect of Humidity and Temperature

Sethuraman

Weidner

Haug³

et al. 2008

J. Electrochem. Soc.

181

107

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The effect of humidity on the chemical stability of two types of membranes ͓i.e., perfluorosulfonic acid type ͑PFSA, Nafion 112͒ and biphenyl sulfone hydrocarbon type, ͑BPSH-35͔͒ was studied by subjecting the membrane electrode assemblies ͑MEAs͒ to open-circuit voltage ͑OCV͒ decay and potential cycling tests at elevated temperatures and low inlet-gas relative humidities. The BPSH-35 membranes showed poor chemical stability in ex situ Fenton tests compared to that of Nafion membranes. However, under fuel cell conditions, BPSH-35 MEAs outperformed Nafion 112 MEAs in both the OCV decay and potential cycling tests. For both membranes, ͑i͒ at a given temperature, membrane degradation was more pronounced at lower humidities and ͑ii͒ at a given relative humidity operation, increasing the cell temperature accelerated membrane degradation. Mechanical stability of these two types of membranes was also studied using relative humidity ͑RH͒ cycling. Due to decreased swelling and contraction during wet-up and dry-out cycles, Nafion 112 lasted longer than BPSH-35 membranes in the RH cycling test.

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confidence: 99%

Durability of Perfluorosulfonic Acid and Hydrocarbon Membranes: Effect of Humidity and Temperature

Sethuraman

Weidner

Haug³

et al. 2008

J. Electrochem. Soc.

181

107

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“…In polysulfone this transition has been shown by NMR studies to involve 180" flips of the phenyl rings. 21 With water present, a distinct y transition appears at -100°C superimposed over the existing p transition. PEI exhibits a broad p transition at 70°C when dry and in addition a rather large y transition appears at -105°C with water present.…”

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confidence: 99%

Miscible blends of poly(aryl ether ketone)s and polyetherimides

Harris

Robeson

1988

J of Applied Polymer Sci

170

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SynopsisA new class of high performance engineering resins, poly(ary1 ether ketone)s, has emerged with a property balance not offered by existing polymeric materials. Blends of poly(ary1 ether ketone)s with other polymers have not been described in the open literature, although several patents have revealed interesting and important properti& of certain blend combinations. Ultem polyetherimide has been found to be miscible over the entire composition range and as a consequence is a very effective heat distortion temperature builder, particularly if the poly(ary1 ether ketone) is allowed to crystallize. Crystallization kinetics and mechanical properties were studied as a function of blend composition and poly(ary1 ether ketone) melting point. The blends exhibited a maximum in toughness at intermediate compositions along with an accompanying maximum in poly(ary1 ether ketone) crystallinity. The chemical resistance of the polyetherimide is significantly improved with the addition of a poly(ary1 ether ketone). In organic chemicals, the improvement was expected when tensile stress was plotted vs. log time to rupture. However, in aqueous bases, the resistance of the blends was much greater than anticipated. This property profile suggests that these blends will be useful as thermoplastic composite matrix resins.

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“…The yield was 1.32 g (66%). 1 Synthesis of 4-chloro-4 0 -(4-hydroxyphenyloxy)diphenyl sulfone (monomer C)…”

Section: Synthesis Of 4-chloro-4 0 -Hydroxydiphenyl Sulfone (Monomer A)mentioning

confidence: 99%

“…1,2 Owing to their amorphous nature, PESs are usually soluble in organic solvents in contrast to semicrystalline poly(ether ketone)s. The solubility of PESs enables the preparation of coatings and thin films via a solvent-casting method for advanced technologies. 3 In general, PESs are synthesized via a nucleophilic aromatic substitution (S N Ar) reaction between dihalogenated diphenylsulfones (A 2 ) and bisphenols (B 2 ) in the presence of a weak base such as potassium carbonate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of poly(ether sulfone)s by self-polycondensation of AB-type monomers

Matsumoto

Komuro

Kai

et al. 2013

Polym J

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Self-polycondensation of AB-type monomers is an advantageous route to produce high-molecular-weight polymers without considerable adjustment in the mole ratio of the functionalities. Furthermore, the resulting polymers incorporate two different functional groups at the chain ends that enable the preparation of AB-and ABC-type block copolymers. In this study, poly(ether sulfone)s (PESs) were prepared via self-polycondensation of four AB-type monomers. The reactivity of the AB-type monomers was systematically investigated through model reactions and nuclear magnetic resonance measurements, which suggested that the novel AB-type monomers, 4-chloro-4 0 -(hydroxyphenyloxy)diphenylsulfone (monomer C) and 4-fluoro-4 0 -(hydroxyphenyloxy)diphenylsulfone (monomer D), are highly susceptible to nucleophilic aromatic substitution (S N Ar) reactions. High-molecular-weight PESs (M w 4110 000) were obtained via the self-polycondensation of monomers C and D. The resulting PESs exhibited excellent thermal properties comparable with PESs prepared from A 2 -and B 2 -type monomers.

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Molecular basis of the β-transition in poly(arylene ether sulfones)

Cited by 65 publications

References 7 publications

Durability of Perfluorosulfonic Acid and Hydrocarbon Membranes: Effect of Humidity and Temperature

Durability of Perfluorosulfonic Acid and Hydrocarbon Membranes: Effect of Humidity and Temperature

Miscible blends of poly(aryl ether ketone)s and polyetherimides

Synthesis of poly(ether sulfone)s by self-polycondensation of AB-type monomers

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