Synthesis and characterization of sulfonated copolyethersulfones

Samperi, Filippo; Battiato, Salvatore; Puglisi, Concetto; Asarisi, Vincenzo; Recca, A.; Cicala, Gianluca; Mendichi, Raniero

doi:10.1002/pola.24079

Cited by 13 publications

(4 citation statements)

References 48 publications

(94 reference statements)

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“…and lower production cost. A number of sulfonated aromatic polymers, such as poly(arylene ether sulfone)s,6–9 poly(arylene ether ketone)s,10–12 poly(phenylene)s,13–15 polyimides,16–19 and polybenzimidazoles,20 have been developed. Nevertheless, further improvement of ionomers properties, especially proton conductivity at low water content, is required.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of multiblock copoly(arylene ether)s containing superacid groups for fuel cell membranes

Mikami

Miyatake

Watanabe

2010

J. Polym. Sci. A Polym. Chem.

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A series of block copoly(arylene ether)s containing pendant superacid groups were synthesized, and their properties were investigated for fuel cell applications. Two series of telechelic oligomers, iodo-substituted oligo(arylene ether ketone)s and oligo(arylene ether sulfone)s, were synthesized. The degree of oligomerization and the end groups were controlled by changing the feed ratio of the monomers. The nucleophilic substitution polymerization of the two oligomers provided iodo-substituted precursor block copolymers. The iodo groups were converted to perfluorosulfonic acid groups via the Ullmann coupling reaction. The high degree of perfluorosulfonation (up to 83%) was achieved by optimizing the reaction conditions. Tough and bendable membranes were prepared by solution casting. The ionomer membranes exhib-ited characteristic hydrophilic/hydrophobic phase separation with large hydrophilic clusters (ca. 10 nm), which were different from that of our previous random copolymers with similar molecular structure. The block copolymer structure was found to be effective in improving the proton-conducting behavior of the superacid-modified poly(arylene ether) ionomer membranes without increasing the ion exchange capacity (IEC). The highest proton conductivity was 0.13 S/cm at 80 C, 90% relative humidity, for the block copolymer ionomer membrane with IEC ¼ 1.29 mequiv/g. V C 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [452][453][454][455][456][457][458][459][460][461][462][463][464] 2011

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of multiblock copoly(arylene ether)s containing superacid groups for fuel cell membranes

Mikami

Miyatake

Watanabe

2010

J. Polym. Sci. A Polym. Chem.

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“…Poly(arylene ether sulfone)s materials are a family of high‐performance engineering plastics with excellent properties, such as film formation, thermal and dimensional stability. Functional poly (arylene ether sulfone)s have been well studied as proton exchange membranes, gas‐separated membranes, adhesives and optical materials 33–35. Herein, we describe the synthesis of a new monomer, 2,6‐difluorobenzoyl aniline tetramer (DFAT) and its facile incorporation into poly(arylene ether sulfone) backbones, yielding copolymers with oligoaniline side chains.…”

Section: Introductionmentioning

confidence: 99%

Patterns of adaptation in patients living long term with advanced cancer

Rose

Kypriotakis

Bowman

et al. 2009

Cancer

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BACKGROUND:With improved treatment, increasing proportions of patients with advanced cancer are surviving longer with their disease: into a second year after diagnosis and beyond. These longer term survivors face continuing challenges in selecting and shifting personal life goals and goals of care over years (rather than months) of life with incurable cancer. Studies are needed to explore adaptation over time in patients who are living longer term with late‐stage cancer, including anxiety, depression, and spiritual well being, which are conceptualized as indicators of psychospiritual well being in patients with advanced cancer.METHODS:Psychospiritual well being and adaptation were explored in a study of middle‐aged and older patients with advanced cancer (N = 142) who survived into a second year after diagnosis and were assessed in interviews across 4 time points. Examining patterns of adaptation over time called for in depth analytical techniques to identify variation in key outcome trajectories. General growth mixture modeling was used to explore heterogeneity in adaptation using a multivariate parallel model of anxiety, depression. and spiritual well being.RESULTS:Modeling revealed 3 distinct group trajectories of psychospiritual well being and adaptation (low‐worsening, moderate‐improving, and high‐stable). Age and education were correlated with group membership. Advanced cancer survivors who were older and had more years of education were more likely to be members of the high‐stable group in psychospiritual adaptation throughout the study.CONCLUSIONS:The current findings suggested that psychospiritual adaptation, as measured in this study, is not uniform but is characterized by heterogeneous trajectories. The results contribute to the development of better hypotheses regarding the processes of adaptation in longer term survivors with advanced cancer and to the identification of potential subgroups at greatest risk for poor outcomes. Cancer 2009;115(18 suppl):4298–310. © 2009 American Cancer Society.

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“…TGA curves of the SPAEB and SPAEB oleum (SO 3 %65) copolymer membranes are shown in Figure 9. The first decomposition step around 300 ∘ C is attributed to the decomposition of the sulfone groups according to the literature [37,38]. Second thermal degradation steps occurring in temperature ranges 450-500 ∘ C should be due to polymer main chain.…”

Section: Ftir Analysis and Thermal Behavior Of Spaeb Membrane Ftir Smentioning

confidence: 87%

Polymer Electrolyte Membrane Fuel Cell Performance of a Sulfonated Poly(Arylene Ether Benzimidazole) Copolymer Membrane

Gerçel

Tosun

Akyalçın

2016

Advances in Materials Science and Engineering

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Disodium-3,3′-disulfonate-4,4′-dichlorodiphenylsulfone (SDCDPS) and 5,5′-bis[2-(4-hydroxyphenyl)benzimidazole] (HPBI) monomers were synthesized. Binding these monomers via nucleophilic aromatic polycondensation reaction, a sulfonated poly(arylene ether benzimidazole) copolymer was synthesized. Structures of monomers and copolymer were confirmed by proton nuclear magnetic resonance spectroscopy (1H NMR) and Fourier transform infrared (FTIR) spectroscopy analyses. Proton exchange membrane was prepared by dissolving copolymer in dimethylacetamide (DMAc) and casting onto a glass plate. Copolymer membrane was doped with sulfuric acid to ensure proton exchange character. Single cell performance of the copolymer membrane was tested in a polymer electrolyte membrane fuel cell test station. The highest power density of the membrane was measured as 23.7 mW cm−2 at 80°C. Thermogravimetric analysis (TGA) showed that as the degree of disulfonation is increased thermal stability of the copolymer is increased.

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Synthesis and characterization of sulfonated copolyethersulfones

Cited by 13 publications

References 48 publications

Synthesis and properties of multiblock copoly(arylene ether)s containing superacid groups for fuel cell membranes

Synthesis and properties of multiblock copoly(arylene ether)s containing superacid groups for fuel cell membranes

Patterns of adaptation in patients living long term with advanced cancer

Polymer Electrolyte Membrane Fuel Cell Performance of a Sulfonated Poly(Arylene Ether Benzimidazole) Copolymer Membrane

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