A Remarkably Thermally Stable, Polar Aliphatic Polysulfone

Schmidt‐Winkel, Patrick; Wudl, Fred

doi:10.1021/ma971799a

Cited by 19 publications

(13 citation statements)

References 23 publications

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“…Then, the sulfone intermediate II lost one molar of phenylsulfinic acid to give 5-arylidene thiohydantoin. This mechanism was very similar to Ei elimination observed by Jenks in the sulfone chemistry, in which sulfone groups act simultaneously as base and leaving group [25,26], an enone and conjugated olefin preparation via phenylsulfinic acid elimination of β-sulfone developed by Trost and Procopiou groups [27–29], and thermal decomposition pathway for polysulfones found by Wudl [30]. …”

Section: Resultssupporting

confidence: 78%

Facile Synthesis of 5-Arylidene Thiohydantoin by Sequential Sulfonylation/Desulfination Reaction

Han

Dong

et al. 2013

IJMS

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The sequential sulfonylation/desulfination reactions of 5-benzylthiohydantoin with excess arylsulfonyl chlorides in the presence of triethylamine have been developed to afford a wide range of 5-arylidene thiohydantoin derivatives in moderate to excellent yields. A plausible sulfonylation/desulfination mechanism was proposed. The bioassay showed that these compounds exhibit certain fungicidal activities with the 71.9% inhibition rate of 2K against B. cinerea, and 57.6% inhibition rate of 2m against A. solani, respectively.

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Section: Resultssupporting

confidence: 78%

Facile Synthesis of 5-Arylidene Thiohydantoin by Sequential Sulfonylation/Desulfination Reaction

Han

Dong

et al. 2013

IJMS

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“…In this study, we have for the first time prepared porous carbon nanofibers from PAN using polysulfone (PSF) as in situ activation agent. PSF is a thermoplastic polymer with a decomposition temperature of 480 °C and high chemical/thermal stability. − The addition of PSF was found to increase fiber–fiber interconnection, mesoporous structure, and graphitization degree but reduce fiber diameter. We found that the PAN/PSF derived carbon nanofibers were especially suitable for making supercapacitor as an electrode material.…”

Section: Introductionmentioning

confidence: 99%

High Performance Supercapacitor Electrode Materials from Electrospun Carbon Nanofibers in Situ Activated by High Decomposition Temperature Polymer

Wang

et al. 2018

ACS Appl. Energy Mater.

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Most previous works on in situ activation of electrospun carbon nanofibers have usually used a sacrificing polymer with a low decomposition temperature (e.g., less than 300 °C) as an activation agent, which leads to limited mesoporous structure and surface area in the carbon nanofibers. In this study, we have prepared carbon nanofibers by carbonization of electrospun polyacrylonitrile (PAN) in the presence of a high decomposition temperature polymer, polysulfone (PSF), which is homogeneously blended with PAN. The use of PSF as in situ activation agent largely increased mesopore content, specific surface area, graphitization degree, interfiber connection, and conductivity in the carbon nanofibers. The PAN/PSF ratio showed an effect on these properties, and 20% PSF within the precursor nanofibers (based on the polymer weight) had the best results. When using the PAN/PSF derived carbon nanofibers as an electrode material, the prepared supercapacitor showed a specific capacitance as high as 289 F/g at the scan rate of 10 mV/s and 257 F/g at the current density of 0.25 A/g. The device had excellent cycling stability (100% capacitance retention after 6000 cycles) and large energy capability (∼36 Wh/kg). Carbon nanofibers activated with PSF may serve as a high performance electrode material for supercapacitor applications.

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“…Aromatic polyether sulfones are some of the important engineering plastics, which are prepared by condensation polymerization and used in a wide range of application fields. Poly(vinyl sulfone)s, that is, poly(alkylene sulfone)s, are obtained by the free-radical copolymerization of olefins or cycloolefins with sulfur dioxide (SO 2 ). − Many kinds of vinyl monomers, such as styrene, vinyl chloride, and acrylic monomers, have been used for the synthesis of poly(vinyl sulfone)s. − The resulting poly(vinyl sulfone)s contain weak sulfur−carbon bonds, which are readily cleaved and induce a fast depolymerization (Scheme ). The copolymerization is usually performed at a low temperature below a ceiling temperature using a redox initiator to obtain a high-molecular-weight polymer.…”

Section: Introductionmentioning

confidence: 99%

Soluble and Thermally Stable Polysulfones Prepared by the Regiospecific and Alternating Radical Copolymerization of 2,4-Hexadiene with Sulfur Dioxide

et al. 2010

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We synthesized the alternating copolymers of 1,3-diene monomers with sulfur dioxide (SO 2 ) as a new class of thermally stable polymers by the radical copolymerization process and the subsequent hydrogenation. The copolymerizations of 2,4-hexadiene (HD), 1,3-butadiene (BD), and isoprene (IP) with SO 2 were carried out at -78 to 0 °C in toluene in the presence of tert-butyl hydroperoxide, which acts as one component in the redox initiating system in combination with SO 2 . The resulting poly(diene-alt-SO 2 )s were found to consist of highly controlled repeating units, that is, an alternating and 1,4-regiospecific repeating structure. Poly(HD-alt-SO 2 ) was soluble in several organic solvents, such as chloroform, nitromethane, tetrahydrofuran, acetone, and dimethyl sulfoxide. In contrast, poly(IP-alt-SO 2 ) was soluble only in dimethyl sulfoxide, whereas poly(BD-alt-SO 2 ) was insoluble in all of the solvents. The poly(diene-alt-SO 2 )s readily degraded upon heating because of the expected fast depolymerization. We have demonstrated that the thermal stability of the poly(diene-alt-SO 2 )s is modified by the hydrogenation of the double bond in the polymer main chain. The hydrogenation of poly(HD-alt-SO 2 ) resulted in a drastic increase in the 5% weightloss temperature from 135 to 317 °C.

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A Remarkably Thermally Stable, Polar Aliphatic Polysulfone

Cited by 19 publications

References 23 publications

Facile Synthesis of 5-Arylidene Thiohydantoin by Sequential Sulfonylation/Desulfination Reaction

Facile Synthesis of 5-Arylidene Thiohydantoin by Sequential Sulfonylation/Desulfination Reaction

High Performance Supercapacitor Electrode Materials from Electrospun Carbon Nanofibers in Situ Activated by High Decomposition Temperature Polymer

Soluble and Thermally Stable Polysulfones Prepared by the Regiospecific and Alternating Radical Copolymerization of 2,4-Hexadiene with Sulfur Dioxide

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