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Resonance measurement of the complex flexural modulus of viscoelastic materials coupled with elastic materials

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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.

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.

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Author notes

  1. L. Szilágyi

    Present address: A.I.C.M.O. at the Polytechnic of Milan, Milan, Italy

  2. G. Locati

    Present address: National Center of Macromolecular Chemistry of C.N.R. Sect. I, Milan, Italy

  3. M. Pegoraro

    Present address: Institute of Industrial Chemistry of the Polytechnic, Milan, Italy

Authors and Affiliations

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    1. L. Szilágyi
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    2. G. Locati
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    3. M. Pegoraro
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    Szilágyi, L., Locati, G. & Pegoraro, M. Resonance measurement of the complex flexural modulus of viscoelastic materials coupled with elastic materials. Kolloid-Z.u.Z.Polymere 223, 97–104 (1968). https://doi.org/10.1007/BF01500504

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    • DOI: https://doi.org/10.1007/BF01500504

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