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  • Polymer and Materials Science  (6)
  • 51  (2)
  • Allyl cations  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Critical capture radius in single wire HGMS (1981)
    Springer
    Applied physics 24 (1981), S. 225-228 
    Details
    ISSN: 1432-0630
    Keywords: 51 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The observation of a large number of particle trajectories in a transversi single wire HGMS has made possible the experimental determination of the critical capture radius. Both the trajectories and the capture radius were found to be in good agreement with calculated values obtained by numerical means using a laminar flow model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899761
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  • 2
    Electronic Resource
    Electronic Resource
    Trajectories of para- and freeomagnetic particles in HGMS filters with axial configurations (1981)
    Springer
    Applied physics 24 (1981), S. 229-232 
    Details
    ISSN: 1432-0630
    Keywords: 51 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The trajectories of para-and ferromagnetic particles with velocities between 0.04 and 2.5 cm s−1 have been investigated in an HGMS model system with axial configuration. A single-wire system has been observed by a TV system. The trajectories were compared with the ideal (inviscid flow) and laminar (viscous flow) model. The results agree with laminar flow model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899762
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  • 3
    Electronic Resource
    Electronic Resource
    Röntgenographische Spannungsermittlung an einem PBTP-Glaskugel-Verbundwerkstoff (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 427-433 
    Details
    ISSN: 0933-5137
    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: It is the aim of the investigations on a PBTP-glass-spherecomposite to get experimental well-founded informations about the state of stress in the polymer matrix of the composite. The used method was the x-ray-lattice strain-stress measurement.The result of the measurements is the proof of a 3-axial state of tension stress in the polymer matrix in the unloaded state as well as under an uniaxial tension load. The reason are differences in the elastic properties of the two components in this heterogenous built up composite.
    Notes: Die Untersuchungen an einem PBTP-Glaskugel-Verbundwerkstoff haben das Ziel, experimentell begründete Aussagen über den Spannungszustand in der Polymermatrix des Verbundwerkstoffes zu gewinnen. Als Meßverfahren wurde die röntgenographische Spannungsmessung verwendet.Im Ergebnis der Messungen konnte in der Polymermatrix des Verbundwerkstoffes sowohl im unbelasteten Zustand als auch bei einachsiger äußerer Zugbeanspruchung ein mehrachsiger Zugspannungszustand nachgewiesen werden. Er ist durch die Unterschiede in den elastischen Eigenschaften der beiden Komponenten des heterogenen aufgebauten Verbundwerkstoffes bedingt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910221110
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  • 4
    Electronic Resource
    Electronic Resource
    Schwingungsrißkorrosion beschichteter Verdichterschaufel-Werkstoffe (1986)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 17 (1986), S. 413-418 
    Details
    ISSN: 0933-5137
    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: Corrosion Fatigue of Coated Compressor Blade MaterialsDamage of compressor blades due to corrosion fatigue constitutes a substantial fraction of the observed stationary gas turbine failures. Dependent on environmental conditions and filtering, these blades in addition may be exposed to mechanical erosion. For corrosion fatigue protection, coatings have been used since many years. However, recently the earlier used NiCd coatings have been substituted to an increasing extent by inorganic coatings containing dispersed aluminum particles as manufactured e.g. by SermeTel. Such coatings are designed to warrant improved corrosion resistance. Within the scope of a joint research project of the German gas turbine manufacturers AEG KANIS, BBC and KWU, some of these protective coatings were tested under simulated operating conditions in different corrosive media with respect to their corrosion fatigue protection capabilities.As a result, it was shown that the aluminum dispersed coatings offer good protection against corrosion in aqueous neutral media at room temperature. One of the coatings tested guarantees in strongly acidious media only a time-limited corrosion protection. At elevated temperatures and also after erosive pre-damage, the fatigue strengths are reduced heavily. In comparison with uncoated specimens, galvanically or chemically deposited nickel-coatings, which were tested concurrently, improved the corrosion resistance only unessentially.
    Notes: Schäden an den Verdichterschaufeln von stationären Gasturbinen infolge von Schwingungsrißkorrosion stellen einen großen Teil der beobachteten Ausfallursachen dar. Zusätzlich sind diese Schaufeln je nach Umgebungsbedingungen mehr oder weniger starker Erosion ausgesetzt. Zum Schutz vor diesen Beanspruchungen werden seit Jahren Beschichtungen eingesetzt, wobei in letzter Zeit die zum Teil eingesetzten NiCd-Schichten vermehrt durch anorganische Schichten aus Chromat/Phosphat-Bindemitteln mit dispergierten Aluminiumpigmenten, z.B. der Firma SermeTel, ersetzt werden, die einen verbesserten Korrosionsschutz gewährleisten sollen. Im Rahmen eines gemeinsamen Forschungsprojektes der deutschen Gasturbinenhersteller AEG KANIS, BBC und KWU wurden einige dieser Schutzschichten in unterschiedlichen, betriebsnahen Korrosionsmedien auf ihre Schutzwirkung besonders gegen Schwingungsrißkorrosion hin untersucht.Als Ergebnis kann festgehalten werden, daß die aluminiumpigmentierten Schichten in neutralem Medium bei Raumtemperatur einen guten Korrosionsschutz bieten. Eine der Schichten gewährleistet in stark saurem Medium nur einen zeitlich begrenzten Korrosionsschutz. Bei höheren Temperaturen und auch nach erosiver Vorschädigung werden die ertragbaren Wechselamplituden dagegen sehr stark herabgesetzt. Parallel dazu geprüfte galvanisch oder chemisch abgeschiedene Nickelschichten verbesserten die Korrosionsbeständigkeit nur unwesentlich gegenüber unbeschichteten Proben.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19860171107
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  • 5
    Electronic Resource
    Electronic Resource
    Forschung in Hoechst, Jubiläumsjahr 1963. XVI, 727 Seiten mit 340, teils mehrfarbigen Abbildungen und 128 Tabellen. Verlag Chemie, GmbH., Weinheim/Bergstr. 1963. Ganzleinen DM 50, -  (1963)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 538-539 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19630140620
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  • 6
    Electronic Resource
    Electronic Resource
    Struktur-Wirkungs-Prinzipien von Korrosionsinhibitoren für die Rohöl- und ErdgasförderungHerrn Prof. Dr. W. Hilger zum 60. Geburtstag gewidmet (1989)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 40 (1989), S. 629-634 
    Details
    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: Structure efficiency relationships of corrosion inhibitors for oil and gas productionStructure efficiency relationships for quarternary ammonium compounds as corrosion inhibitors for oil and gas production were investigated in the system mild steel/aqueous NaCl solution (5 weight%, CO2 saturated) at T = 298 K and T = 343 K by Electrochemical Impedance Spectroscopy (EIS) and weight loss measurements. In-situ EIS measurements rapidly gave relatively accurate results on differential inhibitor efficiencies. Composition, thickness and inhibitor content of the inhomogeneous 3-D protecting layers formed on highly pure iron surfaces were determined by XPS measurements. The inhibition mechanism of the inhibitor used could be determined by its distribution within the 3-D protecting surface layer and is interpreted in terms of the interphase inhibition concept.
    Notes: Struktur-Wirkungs-Prinzipien von quartären Ammoniumverbindungen als Korrosionsinhibitoren für die Rohöl- und Erdgasförderung wurden anhand von Elektrochemischer Impedanz Spektroskopie (EIS) und Gewichtsverlustmessungen in Systemen C-Stahl/wäßrige NaCl-Lösung (5 Gew.%, CO2-gesättigt) bei T = 298 K und T = 343 K untersucht. Es konnte gezeigt werden, daß in-situ EIS Messungen rasch relativ genaue Resultate über differentielle Inhibitorwirksamkeiten liefern. Aus XPS Untersuchungen an Oberflächen aus Reinsteisen ließen sich Zusammensetzung, Dicke und Inhibitorgehalt der sich auf dem Substrat bildenden inhomogenen 3-D Deckschichten bestimmen. Der Wirkungsmechanismus des verwendeten Inhibitors konnte aus seiner Verteilung innerhalb der 3-D Deckschicht mit dem Konzept der Interphaseninhibition gedeutet werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19890401102
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  • 7
    Electronic Resource
    Electronic Resource
    Personalnachrichten (1956)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 432-432 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19560070716
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  • 8
    Electronic Resource
    Electronic Resource
    87. Selbstaggregierende Systeme: Komplexe Fluide mit einer Fließgrenze (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1213-1213 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330660988
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  • 9
    Electronic Resource
    Electronic Resource
    Syntheses of Seven- and Five-Membered Rings from Allyl Cations (1973)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 12 (1973), S. 819-835 
    Details
    ISSN: 0570-0833
    Keywords: Allyl cations ; Cyclization ; Cyclopentanes ; Cycloaddition ; Cycloheptanes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The cycloaddition of allyl cations to conjugated dienes offers an efficient and general tool for the construction of seven-membered carbocycles. The silver salt route is highly suitable for generating allyl cations and can be used even in most difficult cases, i. e. for elusive and intractable allyl cations such as 2-methylallyl, 2-methoxyallyl, and the parent allyl cation. Cycloadditions to the 2-methoxyallyl cation come very close to the prototype of a 6π, 7C reaction, since the carbonyl group introduced into the new ring can either be used for further transformations or be removed altogether. The combination of an allyl cation with π reactants, especially conjugated dienes, is a powerful and strongly convergent synthetic method since it permits one-step assembly, from a C3 and a C4 unit, of a cluster of up to four chiral centers in a ring which is larger than six-membered. Allyl cations combine with electron-rich 2π systems to form novel five-membered rings. The nature of the organometallic intermediates has been elucidated in many cases.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197308191
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  • 10
    Electronic Resource
    Electronic Resource
    The Cycloaddition of Allyl Cations to 1,3-Dienes: General Method for the Synthesis of Seven-Membered Carbocycles. New Synthetic Methods (40) (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 23 (1984), S. 1-19 
    Details
    ISSN: 0570-0833
    Keywords: Cycloaddition ; Allyl cations ; Cations ; Synthetic methods ; Cycloheptanes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of allyl cations and 1,3-dienes affords seven-, five-, and six -membered rings as well as products of electrophilic substitution and linear 1:1-adducts. In this review article, preparative and mechanistic advances are summarized with special emphasis on the synthesis of seven-membered carbocycles. For the first time, a comprehensive mechanistic description is presented: Three classes A, B, and C correlate product type and stereochemistry with the nucleophilicity of the diene, the electrophilicity of the allyl cation intermediate, and the donor capacity of the group Y attached to the central carbon of the allylic moiety. The problem “allylic resonance versus nucleophilic participation of Y” is discussed and experimental evidence is adduced for some participation of Y as a function of its nucleophilicity. For cyclopentenyl cations, enhanced charge separation and electrophilicity are postulated, even when Y is a good donor, due to the structurally enforced polarity of the π-allyl system.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198400013
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