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  • 1
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Internal cathodic protection of salt water pipelines with the aid of platinized titanium anodesIn petroleum production heavy corrosion occurs in the salt water injecting or flooding pipelines. This corrosion can be eliminated either with the aid of a passive protection (protective coating) or, better, by means of an active protection, i.e. cathodic protection with impressed current. While short pipelines can be protected economically with rod anodes, a continuous, partially platinized titanium wire anode has proven must successful for long pipelines. Particular attention must be devoted to the problem of the current feed. The current density required for the protection of bare pipeline surfaces is in the order of 150 mA/sq.m. It can be considerably reduced by combining the active protection with a passive protection by a coating. In connection with the problem of a suitable reference electrode for measuring the protective potential in high pressure pipelines, experiments have been carried out to determine the protective current requirements in a stagnant and a flowing electrolyte respectively. Finally the question of the economy of the process is shortly discussed.
    Notes: Bei der Erdölförderung treten in Salzwassereinpreß- und --flutungsleitungen starke Korrosionen auf. Dieser Korrosion kann man mit einem passiven Schutz (durch Aufbringen eines Schutzanstriches) oder besser mit einem aktiven Schutz, dem kathodischen Korrosionsschutz mit. Fremdstrom, begegnen. Während in kurzen Rohrleitungen einzelne Stabanoden eingesetzt werden können, hat sich bei langen Rohrleitungen eine partiell platinierte Titandrahtanode bewährt. Dabei ist der Stromeinspeisung besondere Aufmerksamkeit zu schenken. Bei blanker Rohroberfläche liegt der Schutzstrombedarf bei 150 mA/m2. Er kann durch Kombinieren des aktiven Schutzes mit einem passiven Schutz (Anstrich) stark reduziert werden. Im Zusammenhang mit dem Problem einer geeigneten Referenzelektrode für die Schutzpotentialmessung in Druckrohrleitungen wurde versucht, den Schutzstrombedarf bei ruhendem und fließendem Elektrolyten festzustellen. Zum Abschluß wird auf Fragen der Wirtschaftlichkeit des Verfahrens eingegangen.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 675-678 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 578-581 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 97 (1981), S. 161-169 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Imidazol enthaltende Polymere wurden durch polymeranaloge Reaktion von Poly(ethylen-methacrylat-arylsulfonaten) mit substituierten Imidazolderivaten hergestellt. Die Imidazolderivate mit exocyclischen funktionellen Gruppen wurden an die Polymermatrix über Seitenketten gebunden. Durch weitere polymeranaloge Reaktionen wurden die exocyclischen funktionellen Gruppen zu Imidazol enthaltenden Polymeren mit primären Aminogruppen oder Carboxylgruppen umgesetzt.
    Notes: Imidazole containing polymers were synthesized by polymer-analogous reactions of poly(ethylene methacrylate arylsulfonates) with substituted imidazole derivatives. The imidazole derivatives with exocyclic functional groups were bound to the polymer matrix via spacers. By further polymer-analogous reactions the exocyclic functional groups were modified, so as to give rise to imidazole containing polymers with primary amino groups or carboxyl groups.
    Additional Material: 3 Tab.
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  • 5
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Neue Imidazol enthaltende Polymere wurden durch nucleophile Substitutionsreaktionen von Poly(ethylen-methacrylatarylsulfonaten) mit Imidazol, Benzimidazol und einigen Derivaten hergestellt. Die Reaktionszeit und die verwendeten Lösungsmittel zeigten wechselnde Effekte auf die Geschwindigkeiten. Der Umsatz war am besten reproduzierbar bei hohen Reaktionsgeschwindigkeiten in Ethanol.
    Notes: New imidazole containing polymers were synthesized by nucleophilic substitution reactions of poly(ethylene methacrylate arylsulfonates) with imidazole, benzimidazole and some of their derivatives. The reaction time and the solvents used had varying effects on the binding rates. The conversion was best reproducible at high reaction speed in ethanol.
    Additional Material: 2 Tab.
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  • 6
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of 1,4-Pentadien-3-ones, 181).  -  Bromo Derivatives of 4-Oxo-1,2,6-triaryl-1-cyclohexanecarbonitriles and their Dehydrobromination ProductsStructure and strerochemistry of various bromo derivatives of 4-oxo-1,2,6-triaryl-1-cyclohexane-carbonitriles 1, 9, and 13 are reported. Dehydrobromination of these derivatives yields cyclohexadienones. Some steric effects of these reactions are discussed.
    Notes: Es wird über Struktur und Stereochemie verschiedener Bromierungsprodukte der 4-Oxo-1,2,6-triaryl-1-cyclohexancarbonitrile 1, 9 und 13 berichtet. Weiter wird die Dehydrobromierung dieser Derivate zu Cyclohexadienonen beschrieben, und sterische Einflüsse werden diskutiert.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 470-477 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In the plasma of electrical discharges polymer samples are subjected to oxidation causing reactive sites or to degradation. Further, a significant volume (depth) effect in a 5 to 10 μm surface layer was observed which was caused by plasma UV radiation. These photolytical effects result in changes of the polymer structure, as crosslinking, change of crystallinity, radical formation etc. Therefore, the etching patterns reflect the features of secondary structures formed by these processes.
    Notes: Polymere werden im Plasma einer elektrischen Entladung an der Oberfläche funktionalisiert (oxydiert) bzw. abgebaut. Daneben wurde jeweils ein signifikanter, auf eine 5 bis 10 μm starke Schicht an der Oberfläche beschränkter Volumeneffekt („Tiefeneffekt“) beobachtet, der durch die Plasma-UV-Strahlung verursacht wird. Diese photolytischen Erscheinungen führen zu Änderungen im Polymergefüge wie Vernetzung, Veränderung der Kristallinität, Radikalbildung usw. Abbildungen von Polymerätzstrukturen spiegeln deshalb in gewissem Umfang die solchermaßen veränderte Sekundärstruktur wider.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 15-18 
    ISSN: 0170-2041
    Keywords: Phosphorus ylides ; Ketenes ; Ketenimines ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Vinylketenimines.The title compounds 5 are generated in situ from N-vinyl-iminotriphenylphosphoranes 1 and ketenes 2 in a Wittig-type reaction. The phosphoranes are useful intermediates for the preparation of numerous heterocycles as illustrated by the formation of 1,3-oxazines 8, pyridinones 9, pyrimidinones 10 and 1,3-thiazines 11. Water adds readily to 5 to yield vinylacetamides 7, whereas thermal rearrangement gives rise to the isoquinoline 4 or the spiro system 6, respectively. Under very mild conditions, crystalline precursors (type 3) of the N-vinylketenimines, which still contain the triphenylphosphonio group, have been isolated. These react like the N-vinylketenimines generated in situ, giving however less byproducts.
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  • 9
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 14 (1993), S. 433-438 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 397-401 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: A model of the reaction between glycidylethers and aromatic cyanates is established. It was found that the trimerization of cyanates, the insertion of glycidylethers, the isomerisation of alkylcyanurates, the oxazolidinone build up, the abstraction of the phenols, and the phenol/glycidylether-addition are the main reactions.
    Notes: Ein Reaktionsmodell der Umsetzung von Glycidethern mit aromatischen Cyansäureestern wird begründet. Als Hauptreaktionen wurden die Trimerisierung der Cyansäureester, die Einschubreaktion der Glycidether in die Cyanuratstruktur, die Isomerisierung der Alkylcyanurate, die Oxazolidinonbildung, die Phenolabspaltung und die Phenol/Glycidether-Addition gefunden.
    Additional Material: 3 Ill.
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