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  • Polymer and Materials Science  (140)
  • 550 - Earth sciences  (17)
  • 1990-1994  (130)
  • 1970-1974  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Trägerkatalysatoren aus C12-allylnickel(II)-komplexen [Ni(C12H19)]X (X = SbF6, O3SCF3) und amorphem aluminiumfluorid in toluol als modell-katalysatoren für das technische katalysatorsystem Ni(octanoat)2/BF3·OEt2/AlEt3 zur 1,4-cis-polymerisation des butadiens39. Mitteilung über Komplexkatalyse, 38. Mitteilung vgl. Lit.15. (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1273-1288 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The η3, η2, η2-dodeca-2(E), 6(E), 10(Z)-trien-1-yl-nickel(II) complexes [Ni(C12H19)]X (X = SbF6, O3SCF3) were treated in toluene with amorphous aluminium trifluoride (which was prepared from AlEt3 and BF3 · OEt2) in a mole ratio 1 : 10 to 20, forming a highly active catalyst for the 1,4-cis polymerization of butadiene. This catalyst is comparable in its activity and selectivity, and in the molar mass distribution of the polybutadiene, with the technical nickel catalyst Ni(O2CR)2/BF3ċOEt2/AlE3 developed by Bridgestone Tire Company thirty years ago. The existence of the C12-allynickel(II) cation [Ni(C12H19)]+ on the AlF3 support could be proved by FAB mass spectroscopic measurements. In agreement with our reaction model for the allyl nickel complex catalyzed butadiene polymerization, it is concluded that the technical nickel catalyst in its effective structure can be described as a polybutadienylnickel(II) complex co-ordinated to a polymeric fluoroaluminate anion via a fluoride bridge.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940502
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  • 2
    Electronic Resource
    Electronic Resource
    Novel nonlinear optically active polymers with photocrosslinkable cinnamoyl groups (1992)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 13 (1992), S. 289-298 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1992.030130508
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  • 3
    Electronic Resource
    Electronic Resource
    Photocrosslinking of silicones. VI.For part V, see Reference 1 Photocrosslinking kinetics of silicone acrylates and methacrylates (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2755-2764 
    Details
    ISSN: 0887-624X
    Keywords: acrylated silicones ; radical photocrosslinking ; polymerization kinetics ; oxygen effect ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photoinduced radical crosslinking of silicones containing pendant acrylate and methacrylate groups has been investigated with calorimetric and ESR measurements. Oxygen very strongly influences this process, which leads to a prolonged induction period and a pseudo first-order termination reaction between polymer radicals and oxygen. Kinetically, such reaction steps are responsible for light intensity and monomer exponents, both of unity. In the absence of oxygen, second-order processes take place between polymer and primary radicals. The results of conversion-time and reaction-rate time measurements using stationary irradiations and postpolymerization experiments agree with the corresponding kinetic expressions. Long-lived polymer radicals and their decay have also been determined with ESR techniques. Long-chain spacer groups, which link the unsaturated ester moiety at the silicone backbone, increase the crosslinking rate. The final conversions of the double bonds exceed high values in each case. © 1992 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080301311
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  • 4
    Electronic Resource
    Electronic Resource
    Berichte über Tagungen und Messen (1972)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 3 (1972), S. 98-103 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19720030212
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  • 5
    Electronic Resource
    Electronic Resource
    Lichtbogen- und Plasmaspritzen von Sondermetallen (1970)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 1 (1970), S. 89-95 
    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: Arc and plasma spraying of special materials with high oxygen affinityWithin the framework of the research work dealt with in this paper, metallic coatings of titanium, tungsten, molybdenum, tantalum and zirconium were produced on steel base material by the spray-deposition process.  -  The affinity of the molten special metals to reactive gases (particularly oxygen) is high, therefore. The spraying operation was carried out in an inert gas chamber. The equipment used to produce these metallic coatings comprised a two-wire arc-gun designed by the authors and a commercially available plasma-gun adapted to suit the test conditions.  -  In the case of all the special metals sprayed in this way the principal mechanism effecting adhesion must be seen to reside in a metallurgical interaction between base und sprayed metal.  -  Observations are discussed concerning structural peculiarities and embrittlement effects depending on the kind of shielding gas employed.
    Notes: Im Rahmen neuerer Forschungsarbeiten wurden metallische Überzüge aus Titan, Wolfram, Molybdän, Tantal, Niob und Zirkon auf stählernem Grundwerkstoff spritztechnisch erzeugt.  -  Die Beschichtungen wurden mit einer 2-Draht-Lichtbogenpistole eigener Bauart und einer den Verhältnissen angepaßten handelsüblichen Plasmapistole durchgeführt. Bedingt durch die hohe Affinität der schmelzflüssigen Sondermetalle zu reaktiven Gasen, vor allem Sauerstoff, wurde das Beschichten in einer Inertgaskammer vorgenommen.  -  Mechanisch-technologische Untersuchungen der Spritzschichten in bezug auf ihre Haftfestigkeit und Mikrohärte sowie metallographische Untersuchungen konnten den Nachweis erbringen, daß es möglich ist, festhaftende dichte und oxidfreie Überzüge aus Sondermetallen durch thermisches Spritzen herzustellen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19700010206
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  • 6
    Electronic Resource
    Electronic Resource
    Beurteilung des Motorenverschleißes zur Bewertung von Motorenölen (1970)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 1 (1970), S. 117-124 
    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: Determination of wear in internal combustion engines for evaluating of motor oilsFor evaluating the wear performance of motor oils the objective determination of the actual extent of wear is especially difficult, for the process of wear is rather complex. This is above all applicable to cylinder wear, for often it is impossible to distinguish definitely between wear and deformation. Because the direction of maximum wear at several tests must not be maintained exactly and because it is difficult to find exactly the same point for measurement at comparison tests, there must as possible carried out circumferential measurements and generatrix measurements for the determination of maximum wear. For defining an allowable maximum wear in specifications there must stated some tolerances, otherwise in critical cases an unjustified classifying of several motor oils may not be excluded.
    Notes: Bei der Beurteilung des Verschleißverhaltens von Motorenölen ist infolge des komplexen Verschleißvorganges in Verbrennungsmotoren die objektive Bestimmung eines absoluten Verschleißmaßes besonders erschwert. Dies gilt vor allem für den Zylinderverschleiß, da es oft unmöglich ist, Verschleiß und Verformung eindeutig voneinander zu trennen. Da die Richtung des maximalen Verschleißes bei verschiedenen Versuchen nicht exakt gleich bleiben muß und es bei Vergleichsmessungen nicht leicht ist, stets die gleiche Meßstelle exakt einzuhalten, sollten möglichst Rundummessungen und Mantellinienmessungen vorgenommen werden, um daraus auf den Maximalverschleiß zu schließen. Deshalb sind bei der Festlegung eines zulässigen Maximalverschleißes in Spezifikationen Toleranzen anzugeben, da in Grenzfällen sonst eine ungerechte Einordnung der Öle nicht ausgeschlossen werden kann.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19700010302
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  • 7
    Electronic Resource
    Electronic Resource
    Oberflächenbeschichtung durch thermisches Spritzen (1973)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 4 (1973), S. 76-81 
    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: Thermal spraying. Thermal spraying in comparison with other coating techniques is characterized by a broad variability of base and spraying materials. After a brief description of actually used equipments some coating properties are summarized. Thermally sprayed special metal will become interesting in near future from commercial and technical point of view. With those metals homogeneous coatings can be produced without porosity.
    Notes: Das thermische Spritzen zeichnet sich gegenüber anderen Verfahren zur Oberflächenbeschichtung durch die Vielfältigkeit der verwendbaren Grund- und Spritzwerkstoffe aus. Neben einer Beschreibung gegenwärtig eingesetzter Geräte wird kurz auf den Schichtaufbau eingegangen. Wirtschaftlich und technisch von besonderem Interesse werden in naher Zukunft thermisch gespritzte Schichten aus Sondermetallen sein, die sich unter Schutzgas porenfrei und homogen erzeugen lassen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19730040206
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen des Verhaltens von zwangspositioniert gelöteten NiCr20TiAl/LNi-5 Verbindungen unter statischer und dynamischer Langzeitbelastung (1990)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 21 (1990), S. 371-377 
    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
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19900211004
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  • 9
    Electronic Resource
    Electronic Resource
    Korrosionsschäden an Rührreaktoren mit DoppelmantelHerrn Prof. Dr. Dr.-Ing. E. h. Heinz Spähn zum 65. Geburtstag gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 122-127 
    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
    Notes: Im Rahmen von wiederkehrenden inneren Prüfungen an mit Außenkesseln versehenen Rührreaktoren, in denen Polymerisationen mit exothermer Reaktion stattfinden, erfolgten Ultraschallwanddickenmessungen an den Innenkesseln.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910220404
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  • 10
    Electronic Resource
    Electronic Resource
    Auswahl von Fluorkunststoffen Diskussion zu “Veränderung von Stahloberflächen durch Reibung” (1972)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 3 (1972), S. 318-322 
    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
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19720030611
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