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  • Polymer and Materials Science  (31,744)
  • Inorganic Chemistry  (8,805)
  • 1985-1989  (19,852)
  • 1975-1979  (17,061)
  • 1950-1954  (3,636)
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  • 1
    Electronic Resource
    Electronic Resource
    Die Beeinflussung der mechanischen Eigenschaften von gehärtetem Wälzlagerstahl 100 Cr6 durch hydrostatischen Druck (1977)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 8 (1977), S. 344-353 
    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: The Influence of Hydrostatic Pressure on the Mechanical Properties of Hardened Rolling Bearing Steel 100 Cr6The paper describes the influence of hydrostatic pressure on the mechanical properties of differently heat-treated rolling bearing steel 100Cr6 based on the triaxial stressing in elements in rolling contact. It is illustrated that hydrostatic pressure superposed on tension changes the data of the tension test depending on the state of the material. While the yield point is not influenced by the pressure, the resistance to fracture and the ductility considerably increase under pressure the increase under pressure being dependent on the heat treatment. The test results show that an optimum adjustment of the heat treatment is possible only if the test conditions reflect the real field conditions. Finally, the applicability of some of the results to the behaviour of material in rolling contact is discussed.
    Notes: Ausgehend von der mehrachsigen Beanspruchung in Wälzelementen durch den Überrollungsvorgang wird der Einfluß eines hydrostatischen Druckes auf die mechanischen Eigenschaften des unterschiedlich gehärteten Wälzlagerstahls 100Cr6 beschrieben. Es wird gezeigt, daß ein dem Zugversuch überlagerter Druck die Kenngrößen des Zugversuches je nach vorliegendem Werkstoffzustand unterschiedlich verändert. Während die Elastizitätsgrenze vom Druck unabhängig ist, steigen Bruchfestigkeit und plastische Verformbarkeit unter Druck erheblich an, wobei die Zunahme dieser Größen durch den Druck von der Wärmebehandlung abhängt. Die Versuchsergebnisse belegen, daß eine exakte Optimierung der Wärmebehandlung nur unter wirklichkeitsgleichen Versuchsbedingungen möglich ist. Abschließend wird versucht, einige der ermittelten Ergebnisse auf das Verhalten des Werkstoffs bei der Wälzbeanspruchung zu übertragen.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19770081008
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  • 2
    Electronic Resource
    Electronic Resource
    Longitudinal growth of polymer crystals from flowing solutions. IV. The mechanical properties of fibrillar polyethylene crystals (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 14 (1976), S. 339-346 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.130140605
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  • 3
    Electronic Resource
    Electronic Resource
    Einfluß des Gefügezustandes auf die mechanischen Eigenschaften von (α + β)- TitanlegierungenVortrag gehalten auf dem Werkstoff-Symposium „Titanlegierungen am 18.2.77, Ruhr-Universität Bochum, Institut für Werkstoffe (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 56-62 
    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: Influence of Microstructure on Mechanical Properties of (α + β)-Ti-AlloysThe amount of α- and β-phase in (α + β)-Titanium alloys for example in the alloy TiAl6 V4 may be altered to a large extend by annealing procedures. In the alloy TiAl6 V4 each temperature corresponds to a certain amount of each of these phases, the composition of which is also dependent on annealing temperature. Above about 970 °C the homogeneous β-phase appears. Additions of Iron, Oxygen, Nitrogen and Hydrogen have a great influence on the transition temperature and the distribution of the α- and β-phase. There is a great influence of the distribution of the phases on the mechanical properties. The β-phase and the α-solid solution can be quenched from high temperature and decomposed at a lower temperature, so that intermediate phases as ω from β and α2 from α may be precipitated. The α-solid solution is anisotropic so that texturized samples have different properties in various directions. Based on these fundamental aspects it is shown to what extend these microstructures may influence the mechanical properties especially the fatigue behaviour of (α + β)-Ti-alloys.
    Notes: Die Anteile des α- und β-Titanmischkristalls in (α + β)-Titanlegierungen können z. B. bei der Legierung TiAl6 V4 in großen Bereichen durch Wärmebehandlung variiert werden. Bei jeder Temperatur stellt sich z. B. bei TiAl6 V4 ein bestimmtes Verhältnis zwischen α und β ein, wobei sich die Legierungskonzentration in den einzelnen Phasenanteilen ändert, bis oberhalb etwa 970 °C die reine β-Phase vorliegt. Beimengungen wie Eisen, Sauerstoff, Stickstoff und Wasserstoff verändern die Umwandlungstemperatur und auch die Anteile der jeweiligen Phasen. Die mechanischen Eigenschaften werden durch das Gefüge entscheidend beeinflußt. Sowohl der β-Mischkristall wie auch der α-Mischkristall können von hoher Temperatur abgeschreckt und bei tiefen Temperaturen zum Zerfall gebracht werden, so daß dadurch weitere Zwischenphasen, wie die ω-Phase im β-Mischkristall und die α2-Phase im α-Mischkristall ausgeschieden werden. Der α-Mischkristall weist eine starke Anisotropie auf, so daß mit Textur behaftete Proben eine Richtungsabhängigkeit der mechanischen Eigenschaften aufweisen. Ausgehend von diesen Grundlagen wird gezeigt, wie sich diese Gefügezustände auf die mechanischen Eigenschaften insbesondere bei schwingender Beanspruchung auswirken.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090205
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Bestimmung der Dispersität von reinem α-Al2O3 für die Herstellung von vakuumdichter Keramik (1977)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 49 (1977), S. 669-669 
    Details
    ISSN: 0009-286X
    Keywords: Porosimetrie ; Porenvolumen ; Zwischenkontakträume ; Porenstruktur ; vakuumdichte Keramik ; Aluminiumoxid ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330490819
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  • 5
    Electronic Resource
    Electronic Resource
    Singlet oxygen and polymer photooxidations. I. Sensitizers, quenchers, and reactants (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 717-736 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study designed to ascertain the role of singlet molecular oxygen in the photodegradation of plastics established that most classes of dye chromophores are sensitizers in polymer films, absorbing light and transferring the absorbed energy to ambient triplet ground state molecular oxygen, generating metastable reactive singlet molecular oxygen. Unsaturated polymers containing polybutadiene, polyisoprene, etc. are highly reactive to singlet oxygen produced through photosensitization, generating hydroxylic and carbonyl derivatives and losing their rubbery properties as consequences of such reactions. Many types of transition metal chelates are singlet oxygen quenchers. The relationships of the structures and spectroscopic properties of these chelates to their efficiency in quenching singlet oxygen are examined and discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130314
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  • 6
    Electronic Resource
    Electronic Resource
    Singlet oxygen and polymer photooxidations. II. Photodegradation of an olefinically unsaturated polymer (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 993-1014 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method based on infrared spectral changes in thin films was devised and used to evaluate the relative effectiveness of various types of additives on photodegradative processes in an olefinically unsaturated polymer. Nickel chelates of the thiobisphenol-amine complex type are shown to be quantitatively more effective in retarding the photodegradation of these polymers than other additives having greater singlet oxygen quenching efficiencies, ultraviolet absorption, or radical antioxidant properties. Photosensitization with a singlet oxygen sensitizer (fluoranthene) rapidly produces degradative effects in the polymer which are identical with those of its direct degradation by light. The sensitized effects are also retarded by the nickel chelates. Photosensitization by a hydrogen atom-abstracting sensitizer (a benzophenone) proved considerably less effective. The effectiveness of the nickel complexes appears to be due to a combination of their ability to quench singlet oxygen and precusor excited states and their relative stability under photoexposure conditions.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130417
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  • 7
    Electronic Resource
    Electronic Resource
    Collagen as a biomaterial: Modulus jump and degradation of collagen gelsPresented before the American Institute of Chemical Engineers 80th National Meeting, Boston, 1975. (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2871-2878 
    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: The effect of temperature on the storage modulus G′ of UV crosslinked collagen has been investigated. Collagen solutions, 0.5%, at pH 2.2 were irradiated at 4°C to a maximum modulus, after which they were stored at 4°C. In order to study the effect of temperatures above 4°C, the gels were placed in a constant-temperature bath and the change in modulus with time was recorded using a torsion pendulum. The temperatures studied ranged from 25° to 60°C. The results show an initial jump in modulus immediately on heating presumably due to the helix-coil transition. The modulus goes through a maximum value. There is then a decay of modulus with time which is linear on a semilog plot. This could indicate a first-order chain-scission reaction, since the storage modulus is directly proportional to the number of crosslinks. A simple kinetic expression can be written for which the value of the rate constant can be determined from the data.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070201021
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  • 8
    Electronic Resource
    Electronic Resource
    Backbone-assisted reactions of polymers. VII. Kinetics of isomerization of poly[(chloromethyl)thiirane] in the absence of solvent (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 313-319 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the repeating unit isomerization of poly[(chloromethyl)thiirane] have been determined at four temperatures in the absence of solvent. The reaction can be treated as a reversible first-order process with rate constants and activation energies similar to those observed in analogous reactions of β-chlorosulfides of low molecular weight. These observations are consistent with a mechanistic scheme that involves rate determining cyclization to a thiiranium ion intermediate, followed by rapid ring opening by chloride ion attack.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260130
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  • 9
    Electronic Resource
    Electronic Resource
    Modification of polyimide coatings by high energy ion bombardment (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 2183-2191 
    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: Exposure of 25-μm films of polyimide and polyamideimide to high doses (〉 1015/cm2) of energetic ions (energy ≥ 100 keV) resulted in physical and chemical modification of the film surface. Cross-section microscopy revealed damaged layers extending beyond the projected ion range; conductivity in this damaged layer was found to be as high as 103ω-1 cm-1. Surface conductivity was found to be a function of ion energy and dose, with an exponential energy dependence from 200 to 900 keV. The temperature dependence and thermal stability of the surface conductivity were determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350818
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  • 10
    Electronic Resource
    Electronic Resource
    Radical copolymerization and terpolymerization of 1,1,2,3,4,4-hexafluoro-1,3-butadiene with alkylvinyl ethers, alkenes, and methyl-2,3,3-trifluoroacrylate (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 155 (1987), S. 101-115 
    Details
    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: Copolymers of 1,1,2,3,4,4-hexafluoro-1,3-butadiene (HFB) with n-alkylvinyl ethers (AVE) (alkyl being butyl, propyl, ethyl, and glycidyl) or alkenes of the type isobutylene, ethylene, and propylene were synthesized by the solution radical copolymerization using low-temperature peroxide initiators. The reaction proceeded by radical mechanism and was fully inhibited by the addition of 1,1-diphenyl-2-picryl-hydrazyl.
    Notes: Copolymere von 1,1,2,3,4,4-Hexafluor-2,3-butadine (HFB) mit n-Alkylvinylethern(AVE) (Alkyl = Butyl, Propyl, Ethyl and Glycidyl) order mit Alkenen wie isobuten, Ethylen and Propylen wurden durch radikalische Lösungscopolymerisation unter Verwendung von peroxidischen Neidertemperatureinition synthesiert. Die Polymerisation verlief nach radikalischem Mechanismus and wurse durde durch die Zugable vo 1,2-Diphenyl-2-pikryl-hydrazyl völling inhibiert. Die Anfangsgeschwindigkeit der Copolymerisation hing von der Gesamtkozentration der Monomeren and von von dem Verhältnis [HFB] zu [AVE] ab; die maximale Reaktiongeschwindigkeit wurde bei etea äquimolaren Konzentrationsverhältnissen der monomeren erzielt.Durch die untersuchung der Struktur der copolymeren HFB-AVE wurde die alter-neirende Anordnung der Hexafluorobutadien-and Vinylethereinheinten in der Copolymerkette nachgewiesen. Durch die radikalische Lösungsterpolymerisation des Monomerensystems HFN-AVE Methyl-2,3,3,-trifluoracrylet (MTFA) wurden Terpolymere des Typus-[HFB]x-[AVE]y-[MTFA]z -synthetisirt, deren Struktur einer alternierrenden Anordnung von Perfluor- (HFB and MTFA) and Vinylethereinheiten entspricht. Durch alkalische hydrolyse der Trifluoracrylateinheiten wurden die entsprechenden Terpolymeren der Triflurocrylsäure synthesiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051550109
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