polymers-13-00276-v2.pdf (12.73 MB)
Effect of SiO2 particles on the relaxation dynamics of epoxidized natural rubber (ENR) in the melt state by time-resolved mechanical spectroscopy
journal contributionposted on 2021-06-21, 16:04 authored by Rossella Arrigo, Leno Mascia, Jane Clarke, Giulio Malucelli
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.
- Aeronautical, Automotive, Chemical and Materials Engineering
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Publisher statementThis is an Open Access Article. It is published by MDPI under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/