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  • 1
    Electronic Resource
    Electronic Resource
    Pumping characteristics of self-wiping twin-screw extruders - A theoretical and experimental study on biopolymer extrusion (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 433-440 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 flow of Newtonian and non-Newtonian fluids which obeys a power law relationship between shear stress and shear rate has been modeled in the melt conveying section of a self-wiping co-rotating twin-screw extruder using a finite element analysis of an unwound channel section. Predictions of throughput against pressure gradient are compared with experimentally obtained results for maize grits which is represented as a power law material. Rheological data applicable to extrusion simulation were obtained from capillary rheometry. Comparisons are reasonable with predicted characteristic showing similar behavior.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760290702
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure losses in the packing stage of injection molding (1986)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 26 (1986), S. 1282-1289 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 pressure loss between the mold and the nozzle in the injection molding of bar and box moldings has been monitored. The pressure drop observed during filling of the mold is reduced during the packing stage but remains finite. This has been attributed in the literature to solidification of polymer across the cavity transducer and to melt relaxation phenomena. Experiments have been carried out with hot molds to prolong the packing stage at the expense of the ‘cooling’ stage. Under these circumstances the pressure drop is reduced but not eliminated. The observed pressure drop may be related to the viscosity of the melt and its dependence on pressure and temperature although strain-induced crystallization and the pressure dependence of the melting point can confer effects similar to the cooling stage.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760261808
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Herstellung und physiologischen Eigenschaften einiger Acetylenverbindungen und verwandter Stoffe. 2. Mitteilung. Über die Umlagerung von 3,4-Di-p-anisyl-3-ol-hexin-(1) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1949-1955 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Attempts to remove water from 3,4-di-p-anisyl-1-hexyn-3-ol in acid medium resulted in rearrangement according to Meyer-Schuster principally and to Rupe to a minor extent. None of the derivatives of these rearrangement products reached the oestrogenicity of stilboestrol. The dehydration of 3,4-di-p-anisyl-3-hexen-2-ol does not lead to the expected diene but to the corresponding methylether of the known 1-ethyl-2-p-hydroxyphenyl-3-methyl-5-hydroxyindene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360734
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stable isotope ratio analysis of leucine and ketoisocaproic acid in blood plasma by gas chromatography/mass spectrometry. Use of tertiary butyldimethylsilyl derivatives (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 14-16 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290020105
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  • 5
    Electronic Resource
    Electronic Resource
    Über einige β-Dialkylaminobuttersäureamide mit anästhetischer Wirkung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1698-1705 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of some β-alkylaminobutyric-acid-amides from the corresponding crotonic acid amides and dimethyl or diethylamine under pressure at 100-150° is described. Two diethylamino acetic acid amides were prepared by reacting N-benzyl-chloracetamide or N-(pethoxybenzyl)-chloracetamide with diethylamine. All these β-dialkyl-aminobutyric and dialkylaminoacetic acid amides show local anaesthetic activity. Two of them (β-diethylaminobutyric acid anilide and β-diethylamino-butyric acid-p-phenetidide) show promise as long acting anaesthetics of low toxicity for nerve block anaesthesia, and are under clinical investigation.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360703
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Herstellung und physiologischen Eigenschaften einiger Acetylenverbindungen und verwandter Stoffe. 1. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1706-1710 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of 3-p-methoxyphenyl-1-pentyne-3-ol,3-p-methoxyphenyl-2-pentene-4-yne, 3,4-bis(p-methoxyphenyl)-1-hexyne-3-ol, some reaction products and the physiological properties of these substances are described. 3,4-Bis(p-methoxyphenyl)-hexyne-ol is practically non-toxic and possesses sedative properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360704
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    New observations on the small-angle x-ray diffraction of synthetic fibers (1950)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 5 (1950), S. 737-738 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1950.120050612
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  • 8
    Electronic Resource
    Electronic Resource
    Observations on small-angle interference maxima in synthetic organic polymersContribution No. 286 from the Chemical Department. Presented at Eighth Annual Pittsburgh Conference on X-Ray and Electron Diffraction, November 2, 1950. (1951)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 449-456 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Off-meridian small-angle x-ray interference maxima and multiple orders of small-angle interference maxima have been observed for certain synthetic high polymer fibers including polythene, polyamides, polyethylene terephthalate, and polyvinyl alcohol. The observations indicate that the ordering of the structures responsible for small-angle diffraction may be two- or three-dimensional rather than one-dimensional and that such ordering must extend over larger volumes of space than previously published data would indicate. The fibers must be given relaxation treatments to form the structures that result in small-angle maxima except for polythene in which they appear merely on orientation. The relaxation treatments increase the crystallite size as shown by large-angle pictures and modify the positions and shapes of the small-angle maxima. An increase in the degree of relaxation increases the intensity of the interference and increases the magnitude of the interplanar spacing except for polyvinyl alcohol, in which the interplanar spacing is not affected. Samples of 66 nylon, which varied in molecular weight from 26,000 to 200,000 gave identical small-angle interference patterns within the limits of accuracy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1951.120070501
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Some features of the injection molding of short fiber reinforced thermoplastics in center sprue-gated cavities (1987)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 8 (1987), S. 16-21 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper describes an investigation into the fiber orientation in a number of center sprue fed cavities in short glass fiber filled polypropylene and nylon. The data have been interpreted in terms of a generalized five-layer structure resulting from the frozen skin formation and the high and low shear levels in the flowing melt. The implications for scaling up the mold size are discussed from the results obtained with different shot volumes. The fiber structure was observed to depend on location in the molding, local injection time, and injection rate. In addition the occurrence of fiber-free layers within the moldings using the filled polypropylene increases with an increase in shot volume, which produces an inherent ‘scale-up’ problem. Notwithstanding the mold geometry subtleties, the fiber orientation in all the moldings follows similar patterns and trends.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750080104
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    Paper (German National Licenses)
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