Abstract
Firstly, it was found that visualization of three-dimensional structure of rubber vulcanizate by 3D-TEM observation necessitated a removal of rubber-soluble zinc compounds, which was derived from ZnO annexed as a vulcanization reagent. The Zn compounds deteriorated the resolution to give enough good resolution for 3-dimensional image construction. Secondly, an experimental method how to remove them on silica-loaded natural rubber vulcanizates was reported. Lastly, the nearest distance (dp) between the silica aggregates in the high-loading region was found 1.3 nm. It was suggested that this dp corresponds to the thickness of the silica/NR interaction layer, i.e., more or less intrinsic bound rubber on particulate silica surface, and the silica network structure in the rubber matrix was clearly visualized. Furthermore, in the case of carbon black (CB), dp in the high loading region was found 3 nm, and the CB network was also visualized. CB network formation was explained by the gelation theory: in the region of CB loading ≦ 20 phr pregel states, and the transition to gel state occurred in the region of CB loading > 20 phr.
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Kohjiya, S., Kato, A., Ikeda, Y. (2020). Nanofiller Dispersion in Rubber as Revealed by 3D-TEM. In: Reinforcement of Rubber. Springer Series on Polymer and Composite Materials. Springer, Singapore. https://doi.org/10.1007/978-981-15-3789-9_4
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