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  • 1
    Electronic Resource
    Electronic Resource
    Studies of the toughness of polycarbonate of bisphenol a in light of its secondary transition
    Amsterdam : Elsevier
    Advances in Molecular Relaxation Processes 1 (1970), S. 375-408 
    Details
    ISSN: 0001-8716
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0001-8716(70)80002-5
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of the toughness of polycarbonate of bisphenol a in light of its secondary transition
    Amsterdam : Elsevier
    Advances in Molecular Relaxation Processes 1 (1970), S. 375-408 
    Details
    ISSN: 0001-8716
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0001-8716(70)80002-5
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  • 3
    Electronic Resource
    Electronic Resource
    Copolymerization of styrene and acrylonitrile in the presence of ethylene-propylene copolymer (1980)
    Springer
    Polymer bulletin 3 (1980), S. 103-110 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The degree of conversion, intrinsic viscosity, composition and particle average size distribution of styrene (S)- acrylonitrile (AN) copolymer, formed mainly under heterogeneous conditions and in the presence of EPM, were investigated as function of the reaction time. An induction period, characterized by unstable preferential solvatation phenomena, is followed by a regular copolymerization period which can be described by apparent S and AN reactivity ratios. The regular copolymerization at high conversion is ascribed to the formation of EPM-g-SAN which acts as an emulsifier in the reaction system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263212
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular weight distribution from rheological measurements (1974)
    Springer
    Rheologica acta 13 (1974), S. 278-282 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Es wird eine einfache und zuverlässige Relativmethode vorgeschlagen, um die Uneinheitlichkeit linearer Polymere abzuleiten. Es wird gezeigt, daß alle beide, Nullschergradient-viskositätη 0, und Grenzviskositätszahl [η], einfach logarithmisch vom Gewichtsmittel des Molekulargewichts $$\bar M_w $$ , und vom Polymolekularitätsindex $$Q = \bar M_w /\bar M_n $$ , abhängig sind. Die Koeffizienten dieser Beziehungen können mit statistischer Analyse festgesetzt werden, wenn $$\bar M_w $$ undQ einer Probenreihe bekannt sind. Mit den zwei vorher festgesetzten Beziehungen besteht die Bestimmung von $$\bar M_w $$ undQ einer gegebenen Polymersprobe nur aus den experimentellen Massen seinerη 0- und [η]-Werte. Eine Analyse wurde ausgeführt, um die Bedeutung des experimentellen Irrtums über die berechnete Uneinheitlichkeit zu wissen. Es wurde gefunden, daß ein experimenteller Irrtum betreffs [η] schwer an endlichem Irrtum der Uneinheitlichkeit teilnimmt.
    Notes: Summary A simple and reliable relative method to derive the molecular weight distribution of linear polymers is proposed. It is shown that both the zero-shear viscosity,η 0, and the intrinsic viscosity, [η], have a logarithmic dependence on the weight average molecular weight, $$\bar M_w $$ , and the polydispersity, $$Q = \bar M_w /\bar M_n $$ . The coefficients of these relationships can be determined by applying a multiple regression analysis to a series of samples for which $$\bar M_w $$ andQ are known. By making use of the two established relationships, the determination of $$\bar M_w $$ andQ for a given polymer sample reduces to the experimental measurement of itsη 0 and [η]. An analysis has been performed to estimate to what extent experimental errors onη 0 and [η] affect the calculated molecular weight distribution. It has been found that only the experimental error on [η] contributes heavily to the final error on the polydispersity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01520889
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  • 5
    Electronic Resource
    Electronic Resource
    Resonance measurement of the complex flexural modulus of viscoelastic materials coupled with elastic materials (1968)
    Springer
    Colloid & polymer science 223 (1968), S. 97-104 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Um den Elastizitätsmodul und den Verlustmodul von Hochpolymeren aus Biegeschwingungen auch im weichen Bereich hoher Dämpfung zu erhalten, wird eine Methode angegeben, in der die Auswertung für eine auf ein ideal elastisches Material (Stahl) aufgeklebte Polymerschicht gebracht wird. E-Modul und mechanischer Verlustfaktor, sowie Aktivierungsenergiewerte am Polystyrol, gewonnen nach dieser Methode, werden mit Ergebnissen nach den üblichen bekannten Verfahren verglichen. Messungen von elastischen Äthylen-Propylen-Copolymerisaten über einen weiten Temperaturbereich (bis weit über die Glasumwandlung) werden berichtet. Die Methode, offenbar einfach anzuwenden, erlaubt viele Möglichkeiten, besonders für die Umwandlungsbereiche und im gummielastischen Bereich.
    Notes: Summary A method is proposed to obtain storage and loss moduli of high polymers from flexural dynamic measurements on composite specimens consisting of high polymers coupled with adhesive to a purely elastic material (steel). Storage modulusE′, loss factorQ −1 and activation energy values obtained with this method on well known polystyrene samples were successfully compared with analogous results obtained by other different methods. Measurements on the elastic copolymer ethylenepropylene were carried out throughout a large temperature region (including temperatures well above the glass transition). The method, which appears easy to apply, presents many possibilities; it allows the use of equations of linear viscoelasticity in transition regions and, particularly, offers great advantage in the study of the rubbery state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500504
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  • 6
    Electronic Resource
    Electronic Resource
    A new method for measuring the complex shear modulus of a viscoelastic material coupled with an elastic material (1970)
    Springer
    Rheologica acta 9 (1970), S. 535-541 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Summary In the mechanical-dynamic characterization of viscoelastic materials as a function of temperature, considerable difficulties are encountered, due to the change of joint, to the strong variation of the modulus of elasticity and the increase ofQ −1. This paper deals with a theoretical and experimental method for the determination of the shear modulusG′2 and of the internal lossQ 2 −1 of a viscoelastic material by measurements at torsional vibration of a composite test-piece. Experimental measurements were carried out on composite test-pieces by gluing of polystyrene and of pinchbeck. The results obtained are in good agreement with the values found by other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985464
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  • 7
    Electronic Resource
    Electronic Resource
    A model for interpreting die swell of polymer melts (1976)
    Springer
    Rheologica acta 15 (1976), S. 525-532 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Es wird ein neues Modell zur Erklärung der wesentlichsten Züge der Strahlaufweitung bei Polymerschmelzen vorgeschlagen. Dieses Modell, das auf kurze Kapillaren beschränkt ist, basiert auf der Beobachtung, daß die von der Schmelze beim Einströmen aus dem Reservoir in die Kapillare ausgeführte Deformation im wesentlichen elastisch, die Deformation beim Durchgang durch die Kapillare dagegen im wesentlichen viskos ist. Unter diesen Voraussetzungen wird eine Gleichung für die Deformation des aus der Kapillare austretenden Polymers angegeben, welche ein Maß für die Aufweitung liefert. Zur Prüfung dieser Gleichung werden Strahlaufweitungsexperimente mit hochdichtem Polyäthylen ausgeführt, wobei das Extrudat in Siliconöl getempert wird. Zwischen Theorie und Experimenten wird eine recht befriedigende Übereinstimmung gefunden, vorausgesetzt daß die charakteristische Relaxationszeitτ in angepaßter Weise bestimmt wird. Es stellt sich heraus, daßτ von der Größenordnung derjenigen Zeit ist, bei der die Schubspannung nach voraufgegangener stationärer Scherströmung vollständig relaxiert ist.
    Notes: Summary We propose here a new model to interpret the most peculiar characteristics of die swelling of polymer melts. The model, which applies to short capillaries, is based on the observations that the deformation undergone by the melt entering the capillary from the reservoir is essentially elastic and that the deformation within the capillary is essentially viscous. Under these assumptions we can derive an equation for the deformation of the polymer emerging from the capillary, which is a measure of swelling. In order to check the validity of this equation swelling experiments were performed on high density polyethylene by using a technique of annealing the strands in silicon oil after extrusion. Quite satisfactory agreement between theory and experiments was found, provided that the characteristic relaxation time,τ, was properly evaluated. In fact it turned out thatτ is of the order of magnitude of the time at which the shear stress fully relaxes in an experiment of stress relaxation after steady state shear flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01515875
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  • 8
    Electronic Resource
    Electronic Resource
    The operation of the rheovibron in the shear mode (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 793-798 
    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: This paper describes the use of the Rheovibron visco-elastometer in the shear mode. A new self-centering sample holder was designed allowing the evaluation of the real and imaginary parts of the shear modulus on low modulus materials such as polymer melts, uncrosslinked and slightly crosslinked elastomers, and elastoplastics.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760181010
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  • 9
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    Resonance measurement of the complex flexural modulus of viscoelastic materials coupled with elastic materials (1968)
    Springer
    Details
    Publication Date: 1968-04-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
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    Copolymerization of styrene and acrylonitrile in the presence of ethylene-propylene copolymer (1980)
    Springer
    Details
    Publication Date: 1980-01-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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