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  • 1
    Electronic Resource
    Electronic Resource
    Correlations between gas permeation and free-volume hole properties probed by positron annihilation spectroscopy (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 2365-2371 
    Details
    ISSN: 0887-6266
    Keywords: positron annihilation ; positronium ; free volume ; hole ; gas permeation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Free-volume hole sizes, fractions, and distributions in a series of polycarbonate-based polymers are measured by using positron annihilation lifetime (PAL) spectroscopy. Correlations between the obtained free-volume hole properties and gas diffusion coefficients are observed. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090331708
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure and morphology of bromo-substituted fully aromatic liquid crystal polyesters (1996)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 290-302 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The bromo-substituted main chain liquid crystal polyesters poly(3-bromo-4-oxybiphenylene-4′-carbonyl) (PBOBC) and poly(5-bromo-6-oxy-2-naphthoyl) (PBONY) have been polymerized as lamellar single crystals using the confined thin film melt polymerization (CTFMP) technique. Electron diffraction indicates a triclinic (pseudo-orthorhombic) unit cell with a=12.71, b=3.85, c=10.50 Å, α=β=γ=90° for PBOBC and a monoclinic unit cell with a=13.02, b=4.06, c=17.15 Å, β=101° for PBONY. The crystal structures of the two polymers have been simulated by the Cerius2 program and are suggested to have space group P for PBOBC and space group P121/c1 for PBONY. DSC measurements indicate that these two bromo-substituted fully aromatic polyesters have crystal-mesophase transition temperatures (Tk-m=389°C for PBOBC and 429°C for PBONY) with TGA indicating the onset of degradation at similar temperatures (400 and 420°C). The Tk-m are between those of the corresponding non-substituted and phenyl-substituted aromatic polyesters. Possible reasons for the Tk-m differences are considered in detail.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1996.010470608
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of benzylic halides on cationic polymerization of 1,3-pentadiene (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1815-1818 
    Details
    ISSN: 0887-624X
    Keywords: 1,3-pentadiene ; cationic polymerization ; crosslinking ; chain transfer ; 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
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  • 4
    Electronic Resource
    Electronic Resource
    The particle size of latexes from dispersion polymerization of styrene using poly(ethylene oxide) macromonomer as a polymerizable stabilizer (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3575-3583 
    Details
    ISSN: 0887-624X
    Keywords: latexes ; dispersion polymerization ; styrene ; PEO macromonomer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The particle sizes and their size distributions of latexes from the dispersion polymerization of styrene using a small amount of ω-methoxy poly(ethylene oxide)n undecyl-α-methacrylate macromonomer (PEO-R-MA-40) as a polymerizable stabilizer in ethanol-water media have been studied. Monodisperse or/and nearly monodisperse latex particles from 0.1 to 1 μm in diameter were readily obtained. The diameter of latex particles follows the relationship Dvad ∝ θ0.33 [PEO-R-MA-40]-0.60 [styrene]01.02 [AIBN]o-0.09, where θ is the fractional conversion of styrene. Except for the styrene concentration dependency, this relationship is in excellent agreement with the model developed by Paine11 and modified by Kawaguchi et al.13 When the surface composition of the grafted PEO macromonomer on the latex particles exceeded 16% as analyzed by X-ray photoelectron spectroscopy (XPS), the particles were nearly monodisperse. In terms of polymerization, this occurred around 18% conversion of styrene. Beyond this critical state of polymerization, the latex particles grew bigger with more PEO macromonomer-styrene copolymers situated on the particle surface. The effect of various factors on the particle size distribution is also discussed. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3575-3583, 1997
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Cationic polymerization of 1,3-pentadiene in the presence of alkyl halides (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 2087-2090 
    Details
    ISSN: 0887-624X
    Keywords: 1,3-pentadiene ; Cationic Polymerization ; crosslinking ; chain transfer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080331216
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  • 6
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung  -  Teil 2 (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 296-303 
    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: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240808
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  • 7
    Electronic Resource
    Electronic Resource
    Selected ion monitoring mass spectrometry: Parameters affecting quantitative determination (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 633-637 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Instrumental parameters and possible correction procedures for hydrogen-transfer phenomena are studied, with emphasis on the improvement of quantitative measurements in selected ion monitoring mass spectrometry. The intensity ratio of the m/z 387 and 386 ions, derived from cholesterol, are measured by an HP-5995 mass spectrometer using different parameters, including calibration peak width, mass filter window size and ion monitoring dwell time. The intrinsic ratio of these two ions is calculated with a correction procedure accounting for the [M—H]+ and [M—2H]+ hydrogen-transfer phenomena.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200121102
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  • 8
    Electronic Resource
    Electronic Resource
    Direct mass spectrometric determination of 13C enrichment of organic compounds (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 638-642 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A direct mass spectrometric measurement method is developed for the determination of 13C enrichment and chemical purity of a labelled compound. The labelled compound is mixed with various amounts of unlabelled analogue to provide a series of mixtures containing different but comparable quantities of labelled and unlabelled species. Intensity ratios of selected isotopically anologous ions from these two species are determined using selected ion monitoring. Equations are established to relate measured intensity ratios to sample mixture weight ratios, chemical purities of the labelled and unlabelled compounds, ion composition and isotopic abundance of the enriched and unenriched carbons, A non-linear regression procedure, based on the measured intensity ratio, the mixture weight ratio and the known chemical purity of the unlabelled compound, is used to resolve the chemical purity and the isotopic abundance yielding results with standard errors of 1.0 and 0.4%, respectively. This procedure is suitable for compounds labelled with more than 60% of an isotope.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200121103
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  • 9
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit unter Berücksichtigung der spannungsmechanischen und statistischen Stützziffer (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 187-196 
    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: Fatigue Limit and Geometrical and Statistical Size EffectThe ratio of the fatigue limit of an unnotched specimen to that of a notched one, the fatigue notch factor Kf, is usually smaller than the theoretical stress concentration factor Kt. With the assumption of a plastic cyclic deformation ∊apW at the level of the fatigue limit the fatigue limit for a notched specimen can be calculated. According to formula (4) this fatigue limit σnaD is a function of Kt, ∊apW, the notch stress amplitude σa, the cyclic strengthening exponent n′ and the fatigue limit of a smooth specimen σW. Moreover, taking into account the statistical size effect with the known “weakest link concept”, see flow chart Fig. 9, the calculation is in a good agreement with 77 test results for steel.
    Notes: Wird eine plastische Wechselverformung im Kerbgrund auch in Höhe der Dauerfestigkeit angenommen, so kann mit Hilfe der Neuber-Formel und des zyklischen Spannungs-Dehnungs-Diagramms eine makroskopische Stützwirkung berechnet werden. Wird weiterhin der statistische Größeneinfluß nach dem Fehlstellenmodell berücksichtigt, so kann die Kerbwirkung bei Bauteilen mit ausreichender Genauigkeit abgeschätzt werden. Der Nachweis für die Treffsicherheit des Modells wird anhand von Versuchsergebnissen an Probestäben aus Stahl geführt.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910220602
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  • 10
    Electronic Resource
    Electronic Resource
    Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung  -  Teil 1 (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 240-249 
    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
    Description / Table of Contents: Estimation of Endurance Limit under Multiaxial LoadingMultiaxial criteria for endurance limit prediction of metallic materials will be discussed in this paper. The Shear Stress Intensity Hypothesis SIH is improved under consideration of the variable fatigue limit ratio τw/σw and mean stress effects. Fatigue behaviour under synchronous and nonsynchronous stresses and influences such as mean stresses, out-of-phase stresses, different frequencies, nonsinusoidal stress time function are analysed theoretically and verified with test results. The prediction according to SIH shows good agreement with the test results. Based on an extensive statistical investigation it can be recommended to use the SIH for „crack free materials“ and the normal stress hypothesis NSH for „materials with cracks“.For components the hypothesis SIH and NSH are developed under consideration of the notch effect. In this study a concept for the prediction of endurance limit under multiaxial loads has been developed.
    Notes: Behandelt werden Festigkeitshypothesen für die Dauerschwingfestigkeit metallischer Werkstoffe bei mehrachsiger Beanspruchung. Die Schubspannungsintensitätshypothese SIH wird hinsichtlich der Berücksichtigung des variablen Wechselfestigkeitsverhältnisses und des Mittelspannungseinflusses weiterentwickelt. Im einzelnen wird das Dauerschwingfestigkeitsverhalten metallischer Werkstoffe bei synchron schwingenden und komplexen zusammengesetzten Beanspruchungen dargestellt. Einflüsse wie Mittelspannung, Phasenverschiebung, Frequenzunterschied und Schwingungsform werden im einzelnen rechnerisch analysiert und experimentell verifiziert. Bei allen experimentell untersuchten Fällen trifft die SIH im allgemeinen zu. Durch die statistische Auswertung anhand von Versuchsergebnissen wird die Schubspannungsintensitätshypothese für „rißfreie Werkstoffe“ und die Normalspannungshypothese für „rißbehaftete Werkstoffe“ zur praktischen Anwendung empfohlen.Die empfohlenen Festigkeitshypothesen werden auf Bauteile erweitert. Aus der vorliegenden Untersuchung wird ein Konzept zur Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung abgeleitet.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240706
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