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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 4 (1966), S. 705-708 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 161-172 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The equilibrium binding constants of Cd++ and Cu++ to native and denatured calf thymus DNA were determined polarographically. The binding constants are an exponential function of the potential at the binding site and as such they vary with ionic strength and with the charge on the DNA molecule. The correlation between the fraction of sites occupied by heavy metal ions and between the thermal stability of DNA in solution is discussed.
    Additional Material: 7 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 18 (1967), S. 782-784 
    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: Corrosion research on niobium-tantalum alloysFollowing a discussion of the mechanical and electrical properties of niobium, tantalum and their alloys, the corrosion behaviour of these metals in different mineral acids and in potash lye is reported upon. It is shown that tantalum can be largely replaced by niobium through alloying without losing any of its high corrosion resistance to aqueous solutions. This knowledge should lead to a much wider application of the rare and expensive metal tantalum.
    Notes: Im Anschluß an eine Darstellung der mechanischen und elektrischen Eigenschaften von Niob, Tantal und deren Legierungen wird über das Korrosionsverhalten dieser Metalle in verschiedenen Mineralsäuren und in Kalilauge berichtet. Es wird gezeigt, daß Tantal durch Legieren weitgehend durch Niob ersetzt werden kann, ohne an seiner sehr guten Korrosionsbeständigkeit in wäßrigen Lösungen einzubüßen. Diese Erkenntnis dürfle zu einer erheblich breiteren Anwendung des seltenen und teueren Metalls Tantal führen.
    Additional Material: 3 Ill.
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  • 4
    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: The corrosion behaviour of IVa, Va and VIa metals as well as RheniumIn general, the non-alloyed metals of groups IVa, Va and VIa of the periodic system as well as Rhenium show a high resistance against corrosion by aqueous solutions, diluted acids and alkalis. Among the IVa metals, Hf shows the highest resistance; like the other IVa metals, it is liable to be strongly attacked by hydrofluoric acid only. Titanium however, which has a high resistance against media containing chlorine or chlorides, is liable to corrode slightly at high temperatures when exposed to diluted, nonoxidant acids or alkaline solutions. Titanum has a high resistance to nitric acid only.Among the Va metals, the corrosion resistance increases greatly from V via Nb to Ta. All three metals are liable to be attacked by hydrofluorid acid; but, with the exception of V, they show a high resistance to other acids and to alkalis.Among the VIa metals, Cr ist the only one to be resistant to nitric acid. On the other hand, nitric acid has a moderate effect on W, and a strong effect on Mo. Yet Mo and W have a high resistance to all other acids, including hydrofluoric acid. Alkalis are liable to attack all VIa metals.Rhenium is a metall with high corrosion resistance. It is only attacked by nitric acid a high temperatures, and by alkalis.
    Notes: Die unlegierten Metalle der Gruppen IVa, Va und VIa des Periodensystems sowie des Rheniums zeigen im allgemeinen gute Beständigkeit gegenüber dem Angriff durch wäßrige Lösungen, verdünnte Säuren und Alkalien. Von den IVa-Metallen ist Hf das beständigste; es wird nur, so wie auch die anderen IVa Metalle, von Flußsäure stark angegriffen. Das gegen chlor- und chloridhaltige Medien gut beständige Titan korrodiert jedoch geringfügig bei erhöhten Temperaturen in verdünnten, nicht oxidierenden Säuren und in alkalischen Lösungen. Hohe Beständigkeit hat Titan nur gegen Salpetersäure.In der Reihe der Va-Metalle steigt die Beständigkeit von V über Nb zu Ta stark an. Alle drei Metalle sind in Flußsäure unbeständig, gegen andere Säuren und Alkalien - mit Ausnahme des V - gut beständig.Von den VIa-Metallen ist Cr nur gegen Salpetersäure beständig: W wird dagegen von Salpetersäure mäßig, Mo stark angegriffen; Mo und W sind aber gegen alle anderen Säuren, einschließlich Flußsäure, gut beständig. Alkalien greifen alle VIa-Metalle an.Rhenium ist ein sehr korrosionsbeständiges Metall. Es wird nur won Salpetersäure bei erhöhter Temperatur und von, Alkalien angegriffen.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 16 (1985), S. 143-150 
    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: Thermometric Investigations for the Determination of the Effective Threshold ΔKthIn metallic materials crack propagation starts with local plastic deformation above the effective threshold for fatigue. Elastic deformation and beginning plastic deformation at a crack tip can be determined thermometrically due to the thermoelastic effect and dissipation of energy. Thus crack opening loads can be defined, and the effective threshold for fatigue may be determined as a constant of material.
    Notes: In metallischen Werkstoffen erfolgt die Ausbreitung eines Ermüdungsrisses mit örtlicher plastischer Verformung oberhalb des effektiven Schwellenwertes der zyklischen Spannungsintensität. Elastische Verformung sowie der Beginn plastischer Verformung an der Spitze eines Risses können unter Ausnutzung des thermoelastischen Effekts sowie der Dissipation der Verformungsarbeit thermometrisch erfaßt werden. Es gelingt auf diese Weise, die Rißöffnungslast und damit den effektiven Schwellenwert der zyklischen Spannungsintensität als Werkstoffkonstante zu bestimmen.
    Additional Material: 15 Ill.
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  • 6
    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: The physical and corrosion-chemical behaviour of IVa metal alloysThe stability of titanium in respect of non-oxidant acids can be considerably increased by alloying it with Zr, Hf, Nb, Mo or Re. In the case of Zr, Hf, Nb and Ta, a decisive improvement of the corrosion behaviour can only be attained if the At-percentage of these metals in the alloys exceeds 50 pC. In the case of molybdenum, a content from 20 pC upwards has already a markedly passivating effect. But the improvement in corrosion properties must be bought at the price of poorer machinability. A particularly effective alloying metal, even in small quantities, is Rhenium. An excellent corrosion resistance and, at the same time, good machinability can be attained with ternary Ti-Mo-Ta alloys (with Mo + Ta accounting for some 20 At-pC) and with a Ti-12Mo-1Re alloy.The alloying of titanium with Zr, Hf, V, Cr or Mo is apt to cause, in some cases, a considerable deterioration in the scaling resistance of titanium. Improvements can be obtained by using small quantities of Nb, W and particularly Ta. Ti-Ta alloys with Ta contents up to 10 At-pC still have a good scaling resistance at 900° C.
    Notes: Die Beständigkeit des Titans gegenüber nichtoxidierenden Säuren läßt sich durch Zulegieren von Zr, Hf, Nb, Mo und Re z.T. beträchtlich steigern. Bei Zr, Hf, Nb and Ta wird eine entscheidende Verbesserung des Korrosionsverhaltens erst bei Gehalten von mehr als 50 At.-% dieser Metalle in den Legierungen erreicht. Molybdän wirkt schon bei Gehalten ab 20% stark passivierend; die Verbesserung der Korrosionseigenschaften muß aber durch schlechtere Verarbeitbarkeit erkauft werden. Ein besonders wirksamer Legierungszusatz, schon in geringen Mengen, ist das Rhenium. Als ganz hervorragend korrosionsbeständig und gleichzeitig gut verarbeitbar erwiesen sich ternäre Ti-Mo-Ta-Legierungen (Mo + Ta 20 At.-%) bzw. eine Ti-12Mo-1Re-Legierung.Die gute Zunderbeständigkeit des Titans wird durch Zulegieren von Zr, Hf, V, Cr und Mo z. T. ganz wesentlich herabgesetzt. Verbessernd wirken Nb, W und vor allem Ta in geringen Mengen. Ti-Ta-Legierungen mit Ta-Gehalten bis 10 At.-% sind noch bei 900° C gut zunderbeständig.
    Additional Material: 10 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 169-179 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polarographically determined binding constants of Cu++ and Cd++ to DNA were found to decrease with the degree of binding. The binding causes a reduction in the electrostatic potential ψ on the DNA molecule. The binding constant conforms to the relation K = K0 exp {-zeψ/kT}. The binding constant at zero potential K0 depends on the nature of the competing counterfoils to the phosphate group of the DNA; it is apparently smaller when Na+ rather than the ethylpyridonium residue of polyvinylpyridine serves as the competing counterfoil. The specific interact ion between the ethylpyridonium residues of the polybase and the DNA is very weak, even though the polyelectrolytic interaction induced by the decrease of the electrostatic free energy is spectacular. The intereaction is reversible and equilibrium is maintained between the different interaction products. A reshuffling of the interacting partners can be effected by spontaneous or induced (by centrifugal forces) precipitation of the least soluble interaction products participating in the equilibrium.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1825-1832 
    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 wavelength dependence of photodegradation of three “high temperature” aromatic polyamide polymers has been very accurately determined by means of a fast grating spectrograph used in conjunction with a high pressure xenon arc. One of these polymers, the poly-(isophthalamide) of 4,4′-bis(p-aminophenyl)-2,2′bithiazole, was found to be degraded significantly by visible light, especially that of 4140 Å, wavelength. Both the poly-terephthalamide of 1,3-bis(3-aminobenzamide) benzene and Du Pont Nomex, also an aromatic polyamide, were damaged primarily by radiation in the near ultraviolet region. Degradation band maxima for these polymers were observed at 3700 Å, and 3600 Å, respectively. All three thermally resistant polymers were thus found to be degraded by light of much longer wavelength than that which is harmful to other common polymers.
    Additional Material: 3 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 59 (1987), S. 882-883 
    ISSN: 0009-286X
    Keywords: Katalyse ; Oxosynthese ; Hydroformylierung ; wasserlösliche Liganden ; 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.
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  • 10
    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: Im ersten Teil der vorliegenden Arbeit werden die chemischen Aspekte des Ozonangriffs auf verschiedene Polybutadiene in Lösung und als Feststoff untersucht. Die Ozonisierung von Polybutadien-lösungen führt zu einem starken Abfall der Grenzviskosität. Das Verhalten von festen Polymerproben wurde mit Hilfe der Elektronen-spinresonanz verfolgt.Die Einwirkung von Ozon auf Solpren 406, ein SBS-Elastomeres, und auf ein kautschukmodifiziertes Polystyrol (HIPS) bewirkt ein starkes Ansteigen der Spannungsrelaxation. Die Abhängigkeiten der Spannungsrelaxation von der Deformation, der Ozonkonzentration und der Temperatur werden untersucht.
    Notes: The effect of ozone exposure on several polymers is investigated. From the chemical point of view the consequence of ozone attack on several polybutadienes in solution and as solid polymers is studied. Ozonization of polybutadiene solutions causes a strong decay in the intrinsic viscosity. The behavior of solid polymers was investigated by electron paramagnetic resonance. In the second part of the paper the influence of ozone on Solprene 406, a SBS-elastomer, and a rubber modified polystyrene on the stress strain behavior is studied. In both cases ozone causes a strong increase of the magnitude of stress relaxation. The dependence of the stress relaxation on the deformation, on the ozone concentration, and on the temperature is described.
    Additional Material: 10 Ill.
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