Download or read book The Synthesis and Characterisation of Perfluoroalkyl Substituted Poly aryl Ether Sulfone s written by and published by . This book was released on 1994 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Synthesis and Characterisation of Perfluoralkyl Substituted Poly aryl Ether Sulfone s written by David Wails and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Functionalized Poly arylene Ether Sulfone s Using ClickChemistry written by Kavitha Neithikunta and published by . This book was released on 2016 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poly(arylene ether sulfone)s with pendent aryl iodide group was successfully synthesized via Nucleophilic aromatic polycondensation of 1-(3,5-difluorophenyl sulfonyl)-4-iodobenzene using 4,4{u2019}-difluorodiphenylsulfone (DFDPS) and Bisphenol A in the ratio 25:75:100. Iodo monomer was prepared by reacting 3,5-difluorodiphenyl sulfone with N-iodo succinimide (NIS). Using GC/MS and NMR spectroscopy, the quantitative analysis was done to this monomer. Modification was done to iodo copolymer using sodium azide and copper sulfate as catalyst to form azide copolymer. Further modification of the azide copolymer to triazole copolymers via Click Chemistry using different alkynes such as 1-octyne, phenyl acetylene, propargyl alcohol and acetylenedicarboxylic acid. Polymers characterization was done using 1H, 13C NMR, IR spectroscopy and SEC. The highest molecular weight (Mw) was found to be 19,033 Da with a PDI 3.0 for iodo copolymer and the least was found to be 6,888 with a PDI 2.5 for acetylenedicarboxylic acid derivative copolymer. Thermal analysis of polymers was done using TGA and DSC. The Td5% values were ranging from 260{u00BA} to 476{u00BA}. The highest Tg was 191{u00BA} for phenyl derivative copolymer and the least was 174{u00BA} for alkyl derivative copolymer. TGA was not ran on azide copolymer as it may contain explosive copper azide traces. IR spectroscopy was used to confirm the structures of azide copolymer, propargyl alcohol derivative and acetylenedicarboxylic acid derivative copolymers.

Download or read book Facile Synthesis of Functionalized Poly arylene Ether Sulfone s written by Mehmet Tatli and published by . This book was released on 2012 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of poly(arylene ether sulfone)s, with a pendant aryl iodide, was achieved via nucleophilic aromatic substitution (NAS) polycondensation of 3-iodo-3',5'-difluoro-diphenylsulfone (2) with Bisphenol-A. Monomer 2 was prepared by the reaction of 3, 5-difluorodiphenylsulfone with N-iodosuccinimide (NIS). Model reactions indicated that the iodo group was stable to NAS conditions. Both GC/MS analysis and NMR spectroscopy indicated quantitative displacement of the two fluorine atoms while the iodo group remained untouched. Furthermore, the modification of the iodo polymer was achieved via Suzuki-Miyaura cross-coupling reaction with phenyl, naphthyl, and phenylacetyl boronic acids. The thermal properties of the polymers were evaluated via DSC and TGA. The iodo polymer possessed a glass transition temperature, Tg, of 144 °C while the corresponding phenyl derivative displayed a slight decrease in Tg to 131 °C. The much bulkier naphthyl derivative provided a higher Tg of 150 °C. The more polar acetyl derivative showed a much higher Tg of 165 °C. All the polymers exhibited high Td-5% values between 400 °C and 500 °C. Moreover, conversion of the iodo moiety to an azide group was achieved by using sodium azide in a straightforward manner with the structure being confirmed by IR and NMR spectroscopies. In addition, the iodo group was replaced with a phenyl group, at the monomer stage, in order to prove that the system not only could be functionalized via "post" but also "pre" modification processes.

Download or read book Synthesis and Characterization of Hyperbranched Poly arylene Ether Sulfone s Via AB2 and ABB Monomer Routes written by Patrick Himmelberg and published by . This book was released on 2005 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introducing Functionality to Poly arylene Ether s Via Modification of Diphenyl Sulfone Type Monomers written by Zahida Humayun and published by . This book was released on 2020 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of poly(arylene ether)s, with a pendent aryl iodide, was achieved via nucleophilic aromatic substitution (NAS) polycondensation of DI-DFDPS monomer. The platform diiodo-difluorodiphenyl sulfone monomer, DFDPS-DI (3), was prepared in one-step, via EAS chemistry. Structural characterization was provided by NMR spectroscopy, GC/MS, and elemental analysis. As "pre" approach didn't work here, so "post" approach was used to synthesize N-heterocycle functionalized copolymers. The DI-copolymers were subjected to copper-catalyzed C-N coupling reaction with carbazole, phenoxazine, and indole and the syntheses of chromophore based copolymer were successfully carried out. A series of PAEs containing carbazole, phenoxazine, and indole substituents were synthesized and characterized. The copolymers were characterized by a combination of NMR spectroscopy, UV/Vis spectroscopy. DI-copolymers displayed had sufficient molecular weight (Mn) and thermal stability with 5% weight loss temperature (Tg) above 388 0C and glass transition temperature, Tg, value above 193 0C. Optical analyses provided that all modified copolymer materials emitted in the light blue region.

Download or read book Polymer Membranes for Fuel Cells written by Javaid Zaidi and published by Springer Science & Business Media. This book was released on 2010-07-15 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the late-1960’s, perfluorosulfonic acid (PFSAs) ionomers have dominated the PEM fuel cell industry as the membrane material of choice. The “gold standard’ amongst the many variations that exist today has been, and to a great extent still is, DuPont’s Nafion® family of materials. However, there is significant concern in the industry that these materials will not meet the cost, performance, and durability requirementsnecessary to drive commercialization in key market segments – es- cially automotive. Indeed, Honda has already put fuel cell vehicles in the hands of real end users that have home-grown fuel cell stack technology incorporating hydrocarbon-based ionomers. “Polymer Membranes in Fuel Cells” takes an in-depth look at the new chem- tries and membrane technologies that have been developed over the years to address the concerns associated with the materials currently in use. Unlike the PFSAs, which were originally developed for the chlor-alkali industry, the more recent hydrocarbon and composite materials have been developed to meet the specific requirements of PEM Fuel Cells. Having said this, most of the work has been based on derivatives of known polymers, such as poly(ether-ether ketones), to ensure that the critical requirement of low cost is met. More aggressive operational requi- ments have also spurred the development on new materials; for example, the need for operation at higher temperature under low relative humidity has spawned the creation of a plethora of new polymers with potential application in PEM Fuel Cells.

Download or read book British Reports Translations and Theses written by British Library. Document Supply Centre and published by . This book was released on 1996 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Poly phenylene Oxide s Containing Perfluoroalkyl Groups written by Xiaoqian Liu and published by . This book was released on 1999 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characteristics of Polyarylene Ether Sulfones written by Ravi Viswanathan and published by . This book was released on 1981 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Routes to N heterocycle Functionalized Poly arylene Ether Sulfone s written by Jesse L. Picker and published by . This book was released on 2014 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of poly(arylene ether sulfone)s, with a pendant aryl iodide, was achieved via nucleophilic aromatic substitution (NAS) polycondensation of 3-iodo-3’,5’-difluoro-diphenylsulfone. The polymer series was subjected to amino acid promoted, copper catalyzed coupling reactions with various N-heterocycles. The resulting polymers became crosslinked and insoluble in any organic solvents. The iodo monomer was then subjected to an amino acid promoted, copper catalyzed coupling reaction with carbazole. The successful synthesis of 3’-(9-carbazole) 3,5-difluorodiphenylsulfone is reported. A series of PAES containing a carbazole substituent were synthesized and characterized. The polymers were characterized by a combination of NMR spectroscopy, SEC, TGA, DSC, UV-Vis spectroscopy. NMR spectroscopy was used to confirm that the carbazole monomer was successfully polymerized. SEC was used to find polymer molecular weights and dispersity. Several polymers in the series showed high thermal stability, and formed tough flexible films when solution cast from N-methyl pyrrolidinone.

Download or read book Synthesis and Characterization of Alkylsulfonylmethyl Substituted Poly oxyalkylene s written by Jong-Chan Lee and published by . This book was released on 1997 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2566 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Poly aryl Ether N substituted Benzimidazoles by Nucleophilic Aromatic Substitution written by Jian Lin and published by . This book was released on 1992 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Arylmethyl Sulfone Dendrimers and Hyperbranched Poly phenylene Sulfide poly sulfone written by Qiuxia Zhao and published by . This book was released on 2007 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Perfluorocyclobutyl PFCB Aryl Ether Polymers for New Fuel Cell Membranes written by Dirk Ewald and published by . This book was released on 2006 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Poly arylene Ether s Containing Phosphorus Sulfur and Heterocyclic Pendant Moieties written by Duane B. Priddy and published by . This book was released on 1994 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: