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  • 1
    Electronic Resource
    Electronic Resource
    Rheology of Lyocell Solutions from Different Cellulose Sources (2000)
    Springer
    Journal of polymers and the environment 8 (2000), S. 151-154 
    Details
    ISSN: 1572-8900
    Keywords: Lyocell ; cellulose ; rheology ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Rheological measurements were used to characterize the behavior of lyocell solutions, i.e., cellulose dissolved in N-methymorpholine-N-oxide. Cellulose sources included dissolving pulp, kraft pulp, sugar cane fibers, and kenaf fibers. The dominance of viscous behavior, G′ values, over elastic behavior, G″ values, is affected by cellulose concentration and molecular weight. At lower concentrations and degrees of polymerization (DP), dissolving pulp solutions show viscous, inelastic behavior at low frequencies. At higher concentration and DP, dissolving pulp solutions are more elastic at higher frequencies. Solutions prepared with kenaf and sugar cane fibers show similar properties to those using pure dissolving pulp, and comparisons suggest the molecular weight and/or the presence of other substances such as lignin in the cellulose from these alternative sources affect the rheology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1014881901010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimizing the tensile strength of polyvinyl chloride with a benzidine additive (1980)
    Springer
    Mechanics of composite materials 15 (1980), S. 664-668 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Diamine added to a PVC mixture treated for 15 min on rollers promotes a strength, gain due to a knitting together of structural elements using macroradicals mat form during mechanical destruction. 2. An increase in treatment temperature above 160°C results in deactivation of the diamine by retaining it in the hydrochloride form of hydrochloric acid liberated in the process of thermal destruction; the latter is predominant under these conditions. 3. The maximum mechanical strength of articles formed from PVC and worked on rollers for 15 min occurs with an additive of 4.25% diamine and at a temperature of 170°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605409
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polymer blends. III. Processing optimization (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 719-724 
    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: Die bei der Untersuchung der Möglichkeiten zur Prozeßoptimierung bei der Verarbeitung von Polymermischungen aus Polyethylen, Polystyren und Polyvinylchlorid mit Ethylen-Vinylacetat-Copolymer als Verträglichkeitsvermittler erhaltenen Ergebnisse werden dargelegt. Es wurde gefunden, daß die Drehzahl der Extruderschnecke der wichtigste Parameter für die Festlegung der Fließgeschwindigkeit der Schmelze und für den Energieverbrauch ist. Die maximalen Durchflußmengen bei Festlegung des spezifischen Energieverbrauchs wurden bestimmt.
    Notes: The paper presents a part of the data obtained in a study on the possibilities of processing optimization of some polymer blends containing polyethylene, polystyrene, poly(vinyl chloride) and ethylene vinylacetate copolymer as compatibility agent. It was found that the screw speed is the most important parameter which influences the melt flow rate and the energy consumption. The maxima of melt flow rate energy consumption at determined energy consumption were determined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010351203
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Optimization of some compounds of polyvinylchloride with 2-ethyl-hexyl-phthalate and an acrylic polymer (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 70-75 
    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: Der Einfluß von Zusammensetzung und Prozeßparametern auf die elektrotechnischen Eigenschaften von Polyvinylchlorid-Acrylpolymer-Mischungen wurde untersucht. Dabei wurden mathematische Modelle aufgestellt, die zur Vorherbestimmung der Eigenschaften der Gemische dienen können.
    Notes: The influence of composition and processing parameters of polyvinylchloride-acrylic polymer blends on the electrotechnical properties has been studied. Mathematical models were obtained, which can be used to predict the properties of the blends.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330112
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  • 5
    Electronic Resource
    Electronic Resource
    Polyethylene-rubber blends. II. Rheological properties (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 704-708 
    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: Die Ergebnisse einiger rheologischer Messungen an Hochdruckpolythylen, das 2,5 bis 10% Polyisopren, Poly(butadien-α-methylstyren) bzw. Poly(butadien-acrylnitril) enthielt, werden beschrieben. Größere Änderungen wurden bei den Mischungen mit Poly(butadien-acrylnitril) festgestellt, was auf die höhere Polarität der Elastomerphase in diesem System zurückzuführen ist. Die Mischungen zeigen ein nicht-newtonsches, pseudoplastisches Verhalten.
    Notes: The paper presents the results of some rheological measurements with high pressure polyethylene, containing 2.5 to 10% polyisoprene, poly(butadiene-α-methylstyrene) or poly(butadiene-acrylonitrile). More important changes are recorded in case of polyethylene-poly(butadiene-acrylonitrile) blends, due to the higher polarity of the rubbery phase from this system. The blends show a non-Newtonian pseudoplastic behaviour.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010321107
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Application of rheological models for the description of the flow characteristics of some polymer systems (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 214-218 
    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: Die Parameter eines verallgemeinerten rheologischen Modells zur Beschreibung der Fließcharakteristik einiger flüssiger Polymersysteme wurden bestimmt. Die Anpassung der experimentellen viskosimetrischen Meßwerte erfolgte durch nichtlineare Regressionsanalyse. Das Verhalten der untersuchten Polymerschmelzen, -suspensionen und -lösungen folgt der allgemeinen Gleichung \documentclass{article}\pagestyle{empty}\begin{document}$ \sigma ^{1/n} = \sigma _o^{1/n} + (\mu \dot \gamma )^{1/m} $\end{document}, worin n, σo, μ und m Parameter darstellen, die die unterschiedlichen Arten des Fließverhaltens charakterisieren.
    Notes: The parameters of a generalized rheological model for the description of the flow characteristics of some fluid polymeric systems are determined. Nonlinear regression analysis is used for the fitting of the experimental viscosimetric data. The behaviour of the investigated polymer melts, suspensions and solutions obeys the general equation \documentclass{article}\pagestyle{empty}\begin{document}$ \sigma ^{1/n} = \sigma _o^{1/n} + (\mu \dot \gamma )^{1/m} $\end{document}, where n, σo, μ and m are parameters which characterize the different types of flow behaviour.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430406
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    Paper (German National Licenses)
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