The attempt to prepare SF₅NOsO₃ by the reaction of OsO₄ and SF₅NH₂ in diethyl ether was not successful. The product obtained was a pale yellow crystalline substance which was identified as OsO₄ by infrared spectra and mass spectrometric data. No indication of SF₅NOsO₃ was observed. Several attempts to prepare Hg(NSF₂)₂ by the treatment of Hg(NCO)₂ with SF₄ in a solvent, such as THF, DMSO, (CH₃)PO₄ or CHCl₃, have failed, apparently due to interfering side reaction and decomposition. In THF and (CH₃)₃P0₄ systems, COF₂ was produced, but no Hg(NSF₂)₂ was produced in the solid product as shown by the infrared spectrum that there was no absorption band at 1313 cm⁻¹ as reported by Glemser for νS=N. No reaction was observed in CHC1₃ at room temperature or 100ºC. The reaction between Mo(CO)₆ and hot ethanol produced a green solution and a dark brown precipitate, for which the C and H analyses were not in agreement with the formula postulated by Buslaev as Mo(OC₂H₅)(OH)₃. The product of the reaction of the green solution and CsF was a light brown precipitate which showed no carbonyl group absorption in the. region at 2000 cm⁻¹. This should be observed for the compound to be postulated as Cs₃Mo₂(CO)₄F₄(OH)₃ by Buslaev. / Master of Science

Diels-Alder polyphenylenes (DAPPs) are chemically and thermally stable polymers, used for dielectric resins, gas separation membranes, and fuel cell proton exchange membranes. Highly fluorinated DAPPs are expected to have better thermal stability and chemical resistance, higher glass transition temperatures, improved compatibility with other fluorinated polymers (like NafionTM), and better adhesion to certain surfaces such as some metals. This thesis proposes a synthesis of highly fluorinated DAPPs by reacting novel, fluorinated bis-cyclopentadienone (CPD) monomers with known aromatic dialkynes. This thesis starts with an introduction to DAPP synthesis, properties, and applications. The second chapter focuses on the synthesis of 4,4′-bis[1,2,4-tris(perfluoro-4-tolyl)cyclopentadien-5-one-3-yl]octafluorobiphenyl (CPD monomer). In the first step, disodiumbis(cyclopentadieny)octafluorobiphenyl was combined with 6 equivalents of octafluorotoluene in HMPA to give 4,4′-bis[1,2,4-tris(perfluoro-4-tolyl)cyclopentadiene-3-yl]octafluorobiphenyl. Oxidation to the corresponding diketone was effected using selenium dioxide. The synthesis of CPD monomer presented several unexpected challenges that were ultimately overcome. The third chapter describes a series of initial polymerization experiments as well as some model reactions that were carried out to understand monomer reactivity. Finally the future research plan of synthesizing different polymers by Diels-Alder reaction and nucleophilic substitution reaction has been discussed. / Master of Science

ªí­±¤Æ¾Ç»â°ì¤¤¡A¬ã¨s¹L´çª÷Äݳ洹ªí­±¤W§lªþºA¤A°ò(C2H5)¤§¤ÏÀ³¡A¤w¦³¬Û·í¦hªº³ø¾É¡C¨ä¦@ÃѬ°£]-H®ø¥h(£]-elimination)§Î¦¨¤A²m(C2H4)²æªþ¬O¥D­n¤ÏÀ³¸ô®|¡C¥»¬ã¨s«h¥H¤£¦Pµ{«×¬t¨ú¥Nªº¤A°ò(ethyl)¡GCF3CF2-¡BCHF2CF2-¡BCF3CHF-¡BCF3CH2-¤ÎCH3CH2-§@¬°¹ï·Ó¡A§lªþ¦bCu(100)³æ´¹­±¤W¥Hµ{·Å¤ÏÀ³/²æªþ(TPR/D)¹êÅç±´°Q¤ÏÀ³¾÷ºc¡Aµ²ªGÅã¥Ü«e¨âºØ¼Ë«~¥ý¶i¦æ£\-F®ø¥h§Î¦¨Ethylideneªí­±¤¤¶¡Åé¡A«eªÌ¦A¦Û¨­°¸¦X©ó350K¥Í¦¨CF3-CF=CF-CF3¡A¦Ó«áªÌ°¸¦X©ó300K¥Í¦¨CHF2-CF=CF-CHF2¡C«á¤TºØ¼Ë«~«hµo¥Í£]®ø¥hª½±µ²£¥ÍCHF=CF2(310K)¡BCH2=CF2(225K)©MCH2=CH2(250K)¡C¥Ñ©ó­n¶i¦æ¸û§C·Å¤§£]®ø¥h¤ÏÀ³®É¡A¹L´çºA§e¥­­±¤ÎEclipsedºc«¬(¦p¥k¹Ï)¡CÂǥѦ¹¬Ý¥X«e¨âºØ¼Ë«~¤§£]¸ô®|¹L´çºA¬O¨ã¦³¨â¹ïF-F¤¬¥¸§@¥Î¡A³o¨Ï±o¹L´çºA¸û¤£Ã­©w¡A¯à»Ùª@°ª¾É­P¤ÏÀ³¸ô®|Â੹¬Û¹ï¯à»Ù¥i¯à¸û§C¤§£\®ø¥h¡C«á¤TºØ¼Ë«~¦æ£]®ø¥h¤§¹L´çºA¦]¦³¸û¤ÖF-F±Æ¥¸¡A©Ò¥H¦æ£]®ø¥h¤ÏÀ³¡C¨Ï¥Î¼ÒÀÀ­pºâªºµ²ªG¤]Åã¥Ü¡A·í©Mª÷ÄÝÁäµ²ªº£\ºÒ¤W¨ã¬t¨ú¥N®É°£³y¦¨ªºÁä¯àÅܱj¡A¥ç·|³y¦¨¦b¹L´çºA¦b¶i¦æª÷ÄÝ-ºÒÁäÂ_µõ®É¯à»Ù¤É°ª¦Ó¶}±Ò¬Û¹ï¯à»Ù¥i¯à¸û§C¤§£\®ø¥h³q¹D¡C¬ã¨sµ²ªG©Ò¤Ï¬M¤A°ò¤W¬t¨ú¥N¦ì¸m¤Îµ{«×¤£¦P©Ò³y¦¨ªº¤ÏÀ³¸ô®|ªº¿ï¾Ü©Ê¡A§¡¥i¥Ñ¤W­z¹L´çºA¤©¥H¦X²zªº¸ÑÄÀ¡C

Made available in DSpace on 2014-10-09T12:38:45Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:05:01Z (GMT). No. of bitstreams: 1 05829.pdf: 3993449 bytes, checksum: f55d718241e0482c76629c4d48cbb722 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

Made available in DSpace on 2014-10-09T12:26:13Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:10:09Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:38:45Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:05:01Z (GMT). No. of bitstreams: 1 05829.pdf: 3993449 bytes, checksum: f55d718241e0482c76629c4d48cbb722 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

Made available in DSpace on 2014-10-09T12:26:13Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:10:09Z (GMT). No. of bitstreams: 0 / O aumento da demanda no Brasil pelo radiofármaco [18F]FDG para exames de tomografia por emissão de pósitron (PET-CT) e sua meia-vida de 109,7 minutos exigem uma atenção especial para a cadeia produtiva deste radiofármaco. Desde a irradiação da água enriquecida em 18O até a passagem do paciente pelo tomógrafo, numa seqüência de procedimentos que pode durar até cerca de seis horas, todas as etapas da cadeia produtiva devem ter a maior confiabilidade possível, pois qualquer falha em uma das etapas será sentida na extremidade da cadeia produtiva. A falta de indicação de posição da válvula do Sistema de Carga e Descarga do Porta-alvo de 18F- no Centro de Aceleradores Cíclotron levou a perda de produção de 18F-, contaminação da Sala de Irradiação e aumento da dose dos trabalhadores envolvidos na operação e manutenção dos sistemas de irradiação. Este trabalho testou o comportamento de três tipos de sensores de posição (microswitch, reedswitch e sensor de proximidade indutivo) no ambiente da Sala de Irradiação 1.2 do Centro de Aceleradores Cíclotron, que está sujeito a altas taxas de radiação gama e nêutrons devido à produção rotineira de 18F- e 123I, através deste teste foi possível encontrar o sensor de posição mais adequado para trabalhar no porta-alvo de 18F-, e através da reprogramação do controlador lógico programável, foi possível evitar este tipo de falha durante a produção de 18F- no Centro de Aceleradores Cíclotron, e aumentar a confiabilidade na cadeia produtiva do [18F]FDG. / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

Call number: LD2668 .T4 1963 H37 / Master of Science

This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.

No description available.