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  • Polymer and Materials Science  (2,008)
  • Life and Medical Sciences  (577)
  • SPACE SCIENCES
  • Wiley-Blackwell  (2,585)
  • 1990-1994  (2,585)
  • 1
    Electronic Resource
    Electronic Resource
    Kunststoffe im Automobilbau - Anwendung und Wiederverwertung (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 275-278 
    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.19910220710
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  • 2
    Electronic Resource
    Electronic Resource
    High-active Ziegler-Natta catalysts on polymeric supports for the manufacture of injection moulding polyethylene (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 601-607 
    Details
    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: Die Immobilisierung von Ti-Mg-Ziegler-Natta-Katalysatoren auf polymeren Trägern aus linearem und vernetztem Polystyren wird beschrieben. Die Katalysatoren werden zur Homopolymerisation von Ethylene im Suspensionsproveß bei 0.84 MPa und 358 K eingesetzt. In Gegenwart von Wasserstoff als Molmassenregler wird Spritzgußpolyethylen in hoher Ausbeute erhalten. Der Einfluß verschiedener Trägerparameter auf katalytische Aktivität, Schmelzindex und Schüttdichte des Polymerisats wird untersucht.
    Notes: Polymeric supports on the base of linear and crosslinked polystyrenes have been used in this work for the immobilization of Ti-Mg Ziegler-Natta complexes. The resulting catalysts are tested in the homopolymerization of ethylene in a suspension process at 358 K and a total pressure of 0.84 MPa. By use of hydrogen for molecular weight control, injection moulding polyethylene in good yield is obtained. Influences of support parameters on a catalytic activity, melt flow index, and bulk density are studied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411203
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  • 3
    Electronic Resource
    Electronic Resource
    High-yield synthesis and characterization of 1,2-bis(p-vinylphenyl)ethane (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2023-2027 
    Details
    ISSN: 0887-624X
    Keywords: 1,2,-bis(p-vinylphenyl)ethane ; crosslinker ; network structure ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The quantitative synthesis and complete characterization of 1,2-bis(p-vinylphenyl)ethane (p,p-BVPE) and its meta-, para-mixed isomers are reported. These crosslinkers copolymerize randomly with p-methylstyrene, leading to random crosslink distributions. The crosslinkers are prepared by Grignard coupling of (m,p)-vinylbenzyl chloride in tetrahydrofuran at low temperature to give the statistical mixture of m,m-, m,p-, and p,p-isomers in quantitative yield. Pure p-vinylbenzyl chloride is converted to pure p,p-BVPE. p,p-BVPE has also been separated from the mixture of isomers. The isomers are characterized by elemental analysis, mass spectrometry, 1H-NMR, and 13C-NMR and by reversed-phase HPLC. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321103
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  • 4
    Electronic Resource
    Electronic Resource
    Novel polystyryl resins for size exclusion chromatography (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2029-2038 
    Details
    ISSN: 0887-624X
    Keywords: 1,2-bis(p-vinylphenyl)ethane ; divinylbenzene ; crosslinker ; network structure ; size exclusion chromatography resins ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New size exclusion chromatography (SEC) resins based on a crosslinker having independent vinyl groups have been produced and compared with SEC resins based on divinylbenzene-55 (DVB). 1,2-Bis(p-vinylphenyl)ethane (p,p-BVPE) and its meta-isomers were suspension-copolymerized with p-methylstyrene in the presence of different porogens to give particles of about 5 μm average diameter. The porous particles were slurry-packed into stainless steel columns for SEC evaluation. Calibration curves were obtained using narrow disperse polystyrene standards with molecular weights ranging from 580 to 3,040,000. The calibration curves for the new BVPE resins covered wider useful molecular weight ranges than those for comparable divinylbenzene resins. Particle size, surface morphology and the properties of pores were studied using a Coulter Multisizer II, scanning electron microscopy, nitrogen adsorption, and mercury porosimetry. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321104
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  • 5
    Electronic Resource
    Electronic Resource
    Redox behaviour of Cu2+/Cl- system at poly-4-(2-pyridylazo)resorcinol modified Glassy Carbon Electrodes (1992)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 243-249 
    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: Thin, adherent and stable polymeric films of 4-(2-pyridylazo)resorcinol (abbreviated as PPAR) were prepared by oxidative polymerization in 0.2 M NaOH solutions. PPAR films deposited on GC electrodes were found to inhibit the electron transfer reactions of the couple [Fe(CN)6]3-/4-. The redox behaviour of CuCl2 in 0.5 M KCl at bare and PPAR-covered GC electrodes was studied by cyclic voltammetry, RDE voltammetry and chronoamperometry. At PPAR-covered electrodes the peak potential of deposition of Cu occurs at ≃ 260 mV more cathodic potential than bare electrodes whereas the redox peaks of Cu2+/1+ and the oxidation of Cu → Cu1+ occur at the same potentials. Catalysis of thc redox processes of the couple Cu2+/1+ at PPAR-covered electrodes is attributed to incorporation of the redox species by chelation and electrostatic attraction. The diffusion coefficient of Cu2+ species (D = 0.29 × 10-5cm2 S-1) at PPAR-covered electrodes was found to be less than at bare electrodes (D = 0.95 × 10-5 cm2 S-1) whereas the effective bulk concentration (CO* = 28 mM) is higher than the used concentration: 10 mM.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19920230707
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  • 6
    Electronic Resource
    Electronic Resource
    Grundlagen zur Herstellung einer Poly-Legierung auf Basis von Chemisch-Nickel unter besonderer Betrachtung der KomplexbildungssystematikAuszug aus der Dissertation des erstgenannten Verfassers, Darmstadt, D 17, demnächst (1992)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 124-132 
    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: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19920230408
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  • 7
    Electronic Resource
    Electronic Resource
    Wirkungsmechanismen von Stabilisatoren in Chemisch-Nickel-Elektrolyten der dritten GenerationAuszug aus der Dissertation des zweitgenannten Verfassers, TH Darmstadt, D 17, demnächst (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 271-280 
    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: Stabilisatoren werden in Elektrolyten zur chemischen Vernickelung eingesetzt, um die Entladung von Nickelionen während der Metallabscheidung auf Abscheidungsniveau stabil zu halten und einer spontanen Elektrolytzersetzung entgegenzuwirken.Die Wirkungsweise von Stabilisatoren ist komplex, die eingesetzten Verbindungen gehorchen jedoch definierten Gesetzmäßigkeiten, welche im einzelnen z. T. noch nicht vollständig geklärt sind. Es ist möglich, mehrere verschiedene Stabilisatoren in einem Stabilisatorsystem zusammenzufassen.Dem jeweiligen Stabilisatorsystem kommt in Chemisch-Nickel-Elektrolyten eine besondere Aufgabe zu, dadurch, daß es in erster Linie reaktionsbestimmend/korrigierend in den katalytischen Prozeß eingreift. Dabei dürfen die erzielbaren Schichteigenschaften über die gesamte Lebensdauer des Elektrolyten nicht negativ beeinflußt werden.Ziel der vorliegenden Untersuchungen ist es, anhand eines definierten Stabilisatorsystems in einem Elektrolyten zur Abscheidung höher phosphorhaltiger ternärer oder quaternärer Nickellegierungen die reaktionsbestimmenden Mechanismen zu diskutieren und in einem Modell, soweit möglich, abzubilden.Dabei ist von besonderem Interesse, welche der beteiligten Teilreaktionen auf welche Weise an diesem Prozeß mitwirkten.Hintergrund dieser Maßnahmen ist die Generierung einer verläßlichen Kontrollmöglichkeit zur besseren Einschätzung von Elektrolytzuständen unter gegebenen Randbedingungen in der Praxis.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240804
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  • 8
    Electronic Resource
    Electronic Resource
    Korrelation der Elemente Zinn, Eisen und Cobalt in der Zusammensetzung außenstromlos abgeschiedener Nickel-Phosphor-Beschichtungen mit LegierungsanteilenAuszug aus der Dissertation des erstgenannten Verfassers, TH Darmstadt, D 17, demnächst (1992)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 352-359 
    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: Aus den Untersuchungen geht deutlich hervor, daß die Entwicklung des Eisengehaltes in einer chemisch-reduktiv hergestellten hoher phosphorhaltigen Beschichtung von äußeren Einflüssen, wie z. B. variierenden Oberflacheneintragen, unabhängig ist. Der jeweilige Arbeits-pH-Bereich bewegte sich dabei zwischen pH = 4,50 und pH = 5,0. Einzig der bei Einbringung der vorbehandelten Ware in den Elektrolyten eingeleitete Tauchabscheidungsvorgang ist bestimmend für die Eiseneinträge in einer solchermaßen hergestellten Chemisch-Nickel-Beschichtung. Die sich einstellenden Eisengehalte reduzieren sich dabei, aufgrund sinkender Schichtporositat, erst bei über 20 pm Überzugsdicke auf unter 0,50 Gew.-%.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19920231006
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  • 9
    Electronic Resource
    Electronic Resource
    Electron transfer mediation characteristics of conducting Polymer Films of 4(5-chloro-2-pyridyl)-1,3-diaminobenzene cobalt complex (1992)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 437-444 
    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: Stable electroactive polymer films of cobalt complex of 4(5-chloro-2-pyridylazo)-1,3-diaminobenzene (abbreviated as PCoL2) were prepared on glassy carbon electrodes by the oxidative polymerization of the complex in acetonitrile. Two pairs of reversible redox peaks for PCoL2 films were observed. The first pair is attributed to the electroactivity of the skeleton of the polymer and the other is attributed to the redox processes of the CO3+/2+ couple. The surface concentration of the electroactive Co sites was found to increase with increasing the film thickness. Mediation of reduction of [Fe(CN)6]3- by PCoL2 films was investigated by steady state measurements. The rate of the mediated reaction was found to be controlled by the rate of the charge propagation within the film & the rate of diffusion of the substrate through the film beside the rate of diffusion of the substrate to the electrode. Thin films were found to be potentially more efficient for the mediation than thicker films.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19920231212
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of tensile deformation on the electrical conductivity of SRF black-loaded SBR blend (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2879-2883 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Styrene butadiene rubber (SBR-1502) was mixed with 100 phr superreinforcing furnace (SRF) black. The obtained rubber vulcanizate was subjected to electrical conductivity measurements at different values of tensile deformation. The log V vs. log I graphs showed two distinct linear stages, the slope of which is nearly independent of the tensile deformation in the first stage and decreases with tensile deformation in the second stage. On the other hand, the tensile deformation was found to have an appreciable effect on the electrical conductivity. It decreases sharply as the sample is suddenly strained and then increases exponentially with time. An empirical formula describing this behavior is suggested.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070421103
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