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Article

Effect of SiO2 Particles on the Relaxation Dynamics of Epoxidized Natural Rubber (ENR) in the Melt State by Time-Resolved Mechanical Spectroscopy

1
Department of Applied Science and Technology and local INSTM Unit, Politecnico di Torino, Viale Teresa Michel 5, 15121 Alessandria, Italy
2
Department of Materials, Loughborough University, Loughborough LE11 3TU, UK
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(2), 276; https://doi.org/10.3390/polym13020276
Received: 18 December 2020 / Revised: 7 January 2021 / Accepted: 12 January 2021 / Published: 15 January 2021
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
The rheological behavior of an epoxidized natural rubber (ENR) nanocomposite containing 10 wt.% of silica particles was examined by time-resolved mechanical spectroscopy (TRMS), exploiting the unique capability of this technique for monitoring the time-dependent characteristics of unstable polymer melts. The resulting storage modulus curve has revealed a progressive evolution of the elastic component of the composite, associated with slower relaxations of the ENR macromolecular chains. Two major events were identified and quantified: one is associated with the absorption of the epoxidized rubber macromolecules onto the silica surface, which imposes further restrictions on the motions of the chains within the polymer phase; the second is related to gelation and the subsequent changes in rheological behavior resulting from the simultaneous occurrence cross-linking and chain scission reactions within the ENR matrix. These were quantified using two parameters related to changes in the storage and loss modulus components. View Full-Text
Keywords: epoxidized natural rubber; ENR; silica nanocomposites; time-resolved mechanical spectroscopy; rheological behavior; gelation epoxidized natural rubber; ENR; silica nanocomposites; time-resolved mechanical spectroscopy; rheological behavior; gelation
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MDPI and ACS Style

Arrigo, R.; Mascia, L.; Clarke, J.; Malucelli, G. Effect of SiO2 Particles on the Relaxation Dynamics of Epoxidized Natural Rubber (ENR) in the Melt State by Time-Resolved Mechanical Spectroscopy. Polymers 2021, 13, 276. https://doi.org/10.3390/polym13020276

AMA Style

Arrigo R, Mascia L, Clarke J, Malucelli G. Effect of SiO2 Particles on the Relaxation Dynamics of Epoxidized Natural Rubber (ENR) in the Melt State by Time-Resolved Mechanical Spectroscopy. Polymers. 2021; 13(2):276. https://doi.org/10.3390/polym13020276

Chicago/Turabian Style

Arrigo, Rossella; Mascia, Leno; Clarke, Jane; Malucelli, Giulio. 2021. "Effect of SiO2 Particles on the Relaxation Dynamics of Epoxidized Natural Rubber (ENR) in the Melt State by Time-Resolved Mechanical Spectroscopy" Polymers 13, no. 2: 276. https://doi.org/10.3390/polym13020276

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