- POLYBENZIMIDAZOLES AND METHODS OF MAKING AND USING THEREOF
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Disclosed are polybenzimidazoles containing sulfonyl groups. The polymers can be synthesized in Eaton's reagent from 3,3′,4,4′-tetraaminodiphenylsulfone, which itself can be synthesized from 4,4′-dichlorodiphenylsulfone. Methods of synthesizing the polymers are disclosed. The disclosed polymers can be used for high temperature H2/CO2 separation membranes and other uses.
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Paragraph 0016; 0128
(2017/04/11)
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- Synthesis and characterization of polybenzimidazoles derived from tetraaminodiphenylsulfone for high temperature gas separation membranes
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Abstract A series of polybenzimidazoles containing sulfonyl groups were synthesized in Eaton's reagent for high temperature H2/CO2 separation membranes. The key monomer, 3,3′,4,4′-tetraaminodiphenylsulfone, was prepared via a novel and economical synthetic route starting from 4,4′-dichlorodiphenylsulfone. These polybenzimidazoles with sulfonyl moieties had enhanced solubilities in dipolar aprotic solvents relative to the commercial Celazole that is prepared from diaminobenzidine. Thermal gravimetric analysis showed that the materials were stable at elevated temperatures with 5% weight loss values of at least 485 °C in either air or N2. Glass transition temperatures of three polybenzimidazoles in this series were ascertained by dynamic mechanical analysis to be 438-480 °C. These sulfonyl-containing polybenzimidazoles exhibited excellent gas separation properties for H2/CO2. Polymers from tetraaminodiphenylsulfone and either terephthalic or isophthalic acid crossed Robeson's upper bound for H2/CO2.
- Borjigin, Hailun,Stevens, Kevin A.,Liu, Ran,Moon, Joshua D.,Shaver, Andrew T.,Swinnea, Steve,Freeman, Benny D.,Riffle,McGrath, James E.
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p. 135 - 142
(2015/07/28)
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- Synthesis and curing of bissulphone
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A new acetylene terminated nitrophenyl sulphone (ATNPS) has been synthesized by nucleophilic displacement reaction between bis(4-chloro-3-nitrophenyl)sulphone and 3-ethynyl aniline.ATNPS is characterized by elemental analysis, IR and 1H-NMR spectroscopies.On heating at ca. 250 deg C or above ATNPS becomes crosslinked due to the presence of the acetylenic end group.The thermal behaviour has been studied by DSC and DTA techniques.The kinetic study of the curing has been carried out by both differential and integral methods by use of a computational programing.
- Dutta, Pradip K.,Maiti, Sukumar
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p. 1023 - 1028
(2007/10/02)
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- Process for preparing of 3,3'-diamino diphenylsulfones
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3,3'-diamino diphenylsulfones are prepared by catalytically reducing and dehalogenating, in the presence of a reduction catalyst and a dehydrohalogenation agent, a diphenylsulfone compound of the general formula STR1 in which X is a halogen atom and Y is hydrogen or a halogen atom.
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