Summary
“Hard” elastic materials are oriented, highly crystalline polymeric products (fibers or films) which show remarkable, long range elastic behavior on single and multiple extension over a very wide range of temperatures. They show a high elastic recovery from 50–100% extension (for example: polypropylene 68 to 97% length recovery from −190°C to 140°C) with a low embrittling effect below the glass transition temperature. Repeated cycling of annealed materials leads to a stable extension-retraction curve with high elastic and work recoveries. Their physical structure is comparatively stable to stress-relaxation and is highly fatigue resistant. The model and its elastic extension mechanism as proposed on the basis of X-ray diffraction and electron microscopic evidence (13) is supported by characteristic sonic modulus and bire-fringence data.
Zusammenfassung
„Hart”-elastische Materialien sind orientierte, hochkristalline Produkte (Fasern und Filme), die außerordentliches, elastisches Verhalten bei sehr hoher einmaliger oder wiederholter Dehnung in einem sehr großen Temperaturintervall aufweisen. Sie haben diese hohe Elastizität für 50–100% Dehnung (z.B. Polypropylen hat 68–97% Längenelastizität von −190 bis 140°C) mit auffallend geringer Sprödigkeit unterhalb der Glastemperatur. Wiederholte Dehnung von getemperten Materialien führt zu einer stabilen Dehnugs-Entspannungskurve mit hohem Längenund Arbeitserholungsvermögen, guter Entspannungsstabilität und hohem Ermüdungswiderstand. Charakteristische Schallmodulus- und Doppelbrechungsmessungen stimmen mit dem Modell der molekularen Überstruktur und dem elastischen Dehnungsmechanismus, der auf Röntgen- und elektronenmikroskopischen Daten (13) basiert ist, überein.
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References
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Park, I.K., Noether, H.D. Crystalline “Hard” Elastic Materials. Colloid & Polymer Sci 253, 824–839 (1975). https://doi.org/10.1007/BF01452402
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DOI: https://doi.org/10.1007/BF01452402