Abstract
The Johari-Goldstein-(JG)-β process dominates some of the mechanical properties of polymeric systems. We studied the JG-β dynamics in a rubber nanocomposite, which is a model system of tire rubber, by quasi-elastic scattering experiments using time-domain interferometry. We observed that the time scale of the local motion of the polymer chain started to decouple from the time scale of the chain diffusion motion on cooling in deeply supercooled region. The temperature dependence of the local relaxation time follows the Arrhenius law down to the glass transition temperature. The JG-β process dominates the local polymer dynamics in the polymer nanocomposite system around the glass transition temperature, similar to the case of the neat polybutadiene system. The time scale of the JG-β process in the polymer nanocomposite system was two times longer than that of the neat polybutadiene system. These results suggest that the presence of silica nanoparticles slows down JG-β relaxations and provides a new clue for understanding the mechanical relaxation properties of polymeric products from a microscopic viewpoint.
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Acknowledgements
The experiments were performed with the approval of the Japan Synchrotron Radiation Research Institute (proposal nos. 2015A1397, 2016A3366, 2017B1397, 2018A1137, 2018B1105, 2018B1161, 2019A1514, and 2019B1442). This work was supported by JSPS KAKENHI (Grant-in-Aid for Young Scientists) Grant No. 19K20600. This work was also supported by the JST CREST Grant No. JPMJCR2095, Japan.
Funding
This work was supported by JSPS KAKENHI (Grant-in-Aid for Young Scientists) Grant No. 19K20600. This work was also supported by the JST CREST Grant No. JPMJCR2095, Japan.
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This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions (HYPERFINE 2021), 5-10 September 2021, Brasov, Romania.
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Saito, M., Mashita, R., Kanaya, T. et al. Effect of silica-nanoparticle fillers on the Johari-Goldstein-β process in polymer nanocomposites. Hyperfine Interact 242, 58 (2021). https://doi.org/10.1007/s10751-021-01784-w
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DOI: https://doi.org/10.1007/s10751-021-01784-w