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  • Articles  (12)
  • Articles: DFG German National Licenses  (12)
  • Wiley-Blackwell  (12)
  • Oxford University Press
  • Periodicals Archive Online (PAO)
  • Physics  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence and efficiency of Ce3+ in SrS powders (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 131-136 
    Details
    ISSN: 1057-9257
    Keywords: II-VI compound ; SrS : Ce ; Photoluminescence ; Concentration quenching ; Phosphorescence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The luminescence efficiency of SrS: Ce powders in the doping range from 0.01 to 1.0 at.% was investigated by photoluminescence decay studies. The radiative decay time of Ce3+ in SrS was determined to be 27 ns. The onset of concentration quenching at concentrations higher than about 0.7 at.% has been obtained. The photoluminescence spectrum of Ce3+ exhibits two emission bands as a consequence of the ground state splitting. The Huang-Rhys factor of the 5d-4f transition was estimated to be about 6. The inhomogeneous broadening of the emission band of samples with higher doping level has been investigated by site-selective and time-resolved spectroscopy.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030119
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  • 2
    Electronic Resource
    Electronic Resource
    Chemische synthese von polysaccharides (1961)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 49 (1961), S. 238-240 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1961.020490116
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  • 3
    Electronic Resource
    Electronic Resource
    Über die synthese unverzweigter polysaccharideHerrn Professor Dr. W. KERN zum 60. Geburtstag gewidmet (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 91 (1966), S. 212-230 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2,3,6-Glucose-tricarbanilate prepared by degradation of cellulosetricarbanilate in 1-hydroxy-2-methoxy-ethane in presence of p-toluenesulfonic acid was condensed with phosphorpentoxide in a mixture of chloroform-dimethyl sulfoxide. Light scattering measurements gave degrees of polymerization up to 640. Contrarily to cellulose- and amylosetricarbanilates there was no definite relation between the STAUDINGER-Indices and molecular weights. Also no angular dependence of the scattered light was found. The products therefore are branched. The side chains are bound to the carbanilate groups, for after alkaline saponification of the polyglucosans the degrees of polymerization decrease to about 60. Degradation experiments with α-amylase and cellulase, optical rotation in tetraethylammoniumhydroxide and viscosity measurements of polyglucosans compared with those of different cellodextrins showed clearly that only 1,4-β-glucosidic linkages are present in the synthetic polysaccharides and that the products are not branched.
    Notes: 2,3,6-Glucosetricarbanilat  -  aus Cellulosetricarbanilat durch Alkoholyse in 1-Hydroxy-2-methoxy-äthan in Gegenwart von p-Toluolsulfosäure hergestellt  -  wurde in Chloroform/Dimethylsulfoxid durch Phosphorpentoxid kondensiert. Streulichtmessungen der Polykondensate ergaben Polymerisationsgrade bis 640. Zum Unterschied von Cellulose- und Amylosetricarbanilaten wurde keine eindeutige Beziehung zwischen STAUDINGER-Indices und Molekulargewichten gefunden. Die Streulichtintensität ergab keine Winkelabhängigkeit. Die Produkte müssen daher verzweigt sein. Die Seitenketten sind an die Carbanilatgruppen gebunden, denn nach alkalischer Verseifung lagen die Polymerisationsgrade bei ca. 60. Aus Abbauversuchen mit α-Amylase und Cellulase, Drehwerten in Tetraäthylammoniumhydroxid und vergleichenden Viskositätsmessungen an den Polyglucosanen und verschiendenen Cellodextrinen geht hervor, daß nur 1,4-β-glucosidische Bindungen in den synthetischen Polysacchariden vorliegen und daß die Produkte unverzweigt sind.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020910114
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  • 4
    Electronic Resource
    Electronic Resource
    Novel model system to study the influence of rubber compound formulation on the structure and composition of the rubber-brass interphase (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 155-162 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A model system was developed to study the influence of the rubber formulation and/or the aging conditions on the adhesion between brass and rubber. The bonding compounds were vulcanized on thin, homogeneous brass layers that had been prepared by sputtering onto special polymeric substrates; some of these compounds were steam-aged under controlled conditions subsequently. After the separation of the polymeric film, combined analytical electron microscopy (transmission electron microscopy/energy dispersive spectroscopy; TEM/EDS) and sputter neutral mass spectrometry (SNMS) analyses were performed. While the TEM/EDS studies offer a detailed insight into the morphological structure of the interphase, the SNMS depth profiles allow a rapid and reliable differentiation between various rubber formulations. With these model samples the beneficial effect of boric acid esters on the adhesion of cobalt-containing bonding compounds, which is observed in a typical short-term adhesion test after steam-aging, can be explained: boric acid esters act with cobalt salts as corrosion inhibitors for brass, preventing the growth of a thick intermediate ZnO/Zn (OH)2 layer that is the starting point for delaminations.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740230306
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  • 5
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XIV. Betrachtungen zur Ermittlung von Verzweigungszahlen im Hochdruckpolyethylen aus dem CH3-DeformationsschwingungsspektrumXIII: Acta Polymerica 31 (1980) 26-30 (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 239-242 
    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: The extinction coefficients of the CH3 deformation vibrations of short chain branchings in saturated polymeric hydrocarbons was determined in dependence on the length of side chains in model substances. The number of CH2 groups arranged between the main chain and methyl group of alkyl branchings affects essentially the intensity of the absorption at 1378 cm-1. The results were applied in the quantitative evaluation of CH3 vibrations for the calculation of the number of branchings in high pressure polyethylene.
    Notes: Die Extinktionskoeffizienten der CH3-Deformationsschwingung von kurzen Kettenverzweigungen in gesättigten polymeren Kohlenwasserstoffen wurden in Abhängigkeit von der Seitenkettenlänge an Modellsubstanzen ermittelt. Die Zahl der CH2-Gruppen, die sich zwischen Hauptkette und Methylgruppe der Alkylverzweigung befinden, beeinflußt wesentlich die Intensität der Absorption bei 1378 cm-1. Die Ergebnisse werden auf die quantitative Auswertung der CH3-Schwingung zur Berechnung von Verzweigungszahlen im Hochdruckpolyethylen angewendet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310405
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  • 6
    Electronic Resource
    Electronic Resource
    Studien zur Verzwigung von Kettenmoleküulen. XVIII. Zur Separierung der Methylbande durch Zerlegung des Absorptionskomplexes bei 1330 bis 1400 cm-1 im IR-Spektrum des PolyethylensXVII. Mitt.: Acta Polymerica 31 (1980) 694. (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 270-276 
    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: Based on an appropriate line shape function the superposition of CH3 and CH2 absorptions of polyethylene between 1330 and 1400 cm-1 was separated into five constitutive bands, two of them being assigned to methyl vibrations. The different length of short branches in high pressure polyethylene enables this separation. Additional characteristics of the line shape and, thus, the fraction of contributing structures are discussed. As a result, the overall branchings and the fraction of ethyl branchings are discerned.
    Notes: Die überlagerten CH3/CH2-Absorptionen der Polyethylenkette im Bereich von 1330 bis 1400 cm-1 werden durch Vorgabe einer geeigneten Linienformfunktion in die Einzelkomponenten zerlegt. Der Komplex besteht aus fünf Teilbanden, zwei werden den Schwingungen der Methylgruppe zugeordnet. Ursache dafür ist die unterschiedliche Länge der kurzen Seitenketten im Hochdruckpolyethylen. Weitere spektrale Größen, die das Bandenprofil und damit auch die Konzentration der anteiligen Strukturen im Komplex bestimmen, werden mitgeteilt. Im Ergebnis der Untersuchungen erhält man neben der Aussage über die Gesamtverzweigung eine weitere Information über den Anteil an Ethylverzweigungen im Produkt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320508
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  • 7
    Electronic Resource
    Electronic Resource
    Surface and microanalytical studies on the corrosion of a Ti5Ta alloy in concentrated nitric acidIn this paper, % means always mass %. (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 16 (1990), S. 265-270 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Ti5Ta alloy shows interesting corrosion behaviour and is becoming technologically important, e.g. for chemical plant construction. Welding and further mechanical tests gave good mechanical properties. Therefore, the corrosion of this alloy was studied in comparison with the corrosion of unalloyed Ti and Ta. The samples were corroded for up to 24 days in hot 67.5% nitric acid.The resulting surface layers were investigated with SEM, transmission electron microscopy (TEM), energy dispersive x-ray microanalyses (EDX), AES and sputtered neutral mass spectrometry (SNMS). Under these conditions, the oxide growth seems to be dependent on the orientation of the crystallites at the surface, which was not observed under milder attack. When Ti5Ta samples were immersed for 5 days in boiling HNO3, the oxide layer was ∼300 nm thick and a particular crack pattern developed on some grains during drying in air at room temperature. This was observed only for oxide layers thicker than 300 nm.After corroding Ti5Ta in boiling HNO3 we observed a TaTi atomic ratio of up to 1:1 using ESCA and up to 5 μm thick Ta oxide-rich scales. The selected area diffraction pattern in the TEM indicates that the oxide film may contain mixed Ti/Ta oxides. The extraordinary Ta oxide enrichment, which is due to the selective dissolution process of Ti, is believed to cause the good corrosion resistance of the alloy. It was not observed after heat treatment in air up to 800 °C or after corrosion tests in HNO3 at room temperature.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740160156
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  • 8
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XV. Zur Linienformanalyse der Absorption der symmetrischen Deformationsschwingung der Methylgruppe bei 1378 cm-1 im IR-SpektrumXIV: Acta Polymerica 31, (1980) Heft 4, 239 (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 532-536 
    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: The wave number at maximum intensity, half width and integral absorption of model polyethylenes were determined. The line shape profiles of the δs(CH3)-vibration are statistically evaluated by momentum analysis. The measured and calculated spectral parameters are correlated with the kind of branching. The consequences for the analysis of the distribution of side chains having different length in high pressure polyethylene are discussed.
    Notes: Von methyl-, ethyl-, butyl- und hexylverzweigten Modellpolyethylenen werden die Wellenzahlen am Intensitäts-maximum, die Halbwertsbreiten und die integralen Absorptionen gemessen. Die Linienformprofile der δs(CH3)-Schwingung werden auf der Grundlage einer Momentanalyse einer statistischen Auswertung unterzogen. Der Verlauf der gemessenen und berechneten spektralen Parameter wird mit der entsprechenden Verzweigungsart korreliert. Die Konsequenzen für eine Analyse der Verteilung der im Hochdruckpolyethylen enthaltenen unterschiedlich langen Seitenketten werden diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310812
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  • 9
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des HochdruckpolyethylensIX: Faserforsch. u. Textiltechnik/Z. Polymerforsch. 29 (1978) 521-525. (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 557-562 
    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: The short chain branching in low density polyethylene obtained under various conditions were determined by γ-irradiation followed by gaschromatography of the gaseous scission products. The pressure and temperature of polymerization were found to affect the kind and number of branchings. The branching structure and reaction parameters are related and discussed on a kinetic concept.
    Notes: Die Kurzkettenverzweigung von unter verschiedenen Bedingungen synthetisierten Hochdruckpolyethylenen wurde mit Hilfe der γ-Bestrahlung und nachfolgender gaschromatographischer Analyse der Spaltgase bestimmt. Es wurde experimentell belegt, daß Reaktionsdruck und Polymerisationstemperatur Art und Anzahl der Seitenzweige beeinflussen. Verzweigungsstruktur und Reaktionsparameter werden zueinander in Beziehung gesetzt und auf der Grundlage kinetischer Überlegungen diskutiert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300905
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  • 10
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XXI. Zum Einfluß der Comonomere auf die Bildung von Kurzkettenverzweigungen bei der HochdruckpolyethylensyntheseXX. Mitt.: Acta Polymerica 32 (1981) 10, 620. (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 151-155 
    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: The effect of propylene and vinyl acetate used as comonomers in the synthesis of high pressure ethylene copolymers on the hydrogen transfer is discussed. The structural changes caused by the comonomers in the chain segments and possibly enabling transfer reactions did really not result in measurable differences of the number of short chain branchings by intramolecular transfer. The differences in the potential and rotational energy in these structures and that of the unsubstituted CH2 chain is suggested to be small with respect to kT, thus the hindrance of rotation being unimportant. The number and kind of short chain branchings depend decisively, as in the homopolymerization of polyethylene, on the reaction parameters pressure and temperature.
    Notes: Der Einfluß der Comonomere Propylen und Vinylacetat auf die intramolekulare Wasserstoffübertragung bei der Hochdrucksynthese der Ethylen-Copolymere wird diskutiert. Es wird gezeigt, daß die durch den Einbau der Comonomere bedingten strukturellen Unterschiede in den zur Übertragung befähigten Kettensegmenten keine meßbaren Änderungen der Zahl der durch intramolekulare Übertragung gebildeten Kurzkettenverzweigungen hervorrufen. Es wird angenommen, daß die Differenz zwischen dem Rotationsenergiepotential dieser Strukturen und dem der unsubstituierten CH2-Kette klein bezüglich kT sein muß, so daß das Rotationsbehinderungspotential nur eine gering fügige Änderung erfährt. Entscheidend für die Zahl und Art der Kurzkettenverzweigungen sind wie bei der Homopolymerisation des Ethylens die Reaktionsparameter Druck und Temperatur.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330210
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