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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, Leno Mascia, Jane Clarke, and Giulio Malucelli. 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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