Effect of Vulcanization System on Damping Properties of Natural Rubber

Natural rubber (NR) is vulcanized with three different systems, using sulfur, peroxide and a mixed system consisting of peroxide and sulfur. The viscoelastic behavior of rubbers is evaluated by Dynamic Mechanical Analysis (DMA), using constant or multiple frequencies. From both DMA analysis methods,...

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Veröffentlicht in:Macromolecular symposia. 2022-12, Vol.406 (1), p.n/a
Hauptverfasser: Baruel, Amanda Faria, Mello, Sandra Aparecida Coelho, Menezes, Fernanda, Cassu, Silvana Navarro
Format: Artikel
Sprache:eng
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Zusammenfassung:Natural rubber (NR) is vulcanized with three different systems, using sulfur, peroxide and a mixed system consisting of peroxide and sulfur. The viscoelastic behavior of rubbers is evaluated by Dynamic Mechanical Analysis (DMA), using constant or multiple frequencies. From both DMA analysis methods, it is possible to verify that the rubbers vulcanized with sulfur or with the mixed system presented superior storage modulus in the rubbery region, and higher Tg values compared to the rubber vulcanized with dicumyl peroxide. These results indicate a higher degree of crosslinking for the NR containing sulfur in its vulcanization system. The master curves show that the rubber vulcanized with sulfur presented relaxation at a lower frequency due to the higher hardness, which is a consequence of the higher degree of crosslinking.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.202200040