Anomalous small-angle X-ray scattering analyses on hierarchical structures of rubber-filler systems

Figure 8

Rg,ZZ of ZnS plotted as a function of CB.

independent of CB, agreeing with the results of elemental

mapping in rubber by energy-filtering transmission electron

microscopy and SAXS (Dohi & Horiuchi, 2007). This result

suggests that the vulcanization is not greatly affected by the

presence of CB.

4. Conclusions

We applied the ASAXS method to SBR/CB systems vulcanized with sulfur and ZnO to investigate their hierarchical

structures. We successfully eliminated the effects of Zn on the

scattering intensity and obtained the structure factors of CB in

SBR/CB systems using the ASAXS method. We measured the

CB volume fraction dependence of the structure factor, and

estimated the particle structure factor of the CB aggregate by

extrapolating to the zero-volume fraction of CB. The CB

aggregates are found to consist of closely packed CB primary

particles. We also confirmed the presence of large particles of

ZnO and particles of ZnS on the order of 10 nm.

Acknowledgements

We express sincere thanks to Dr Naoya Amino and Dr Satoshi

Mihara; and The Yokohama-rubber Company Ltd, for the

sample preparation. The synchrotron USAXS/SAXS/WAXD

experiments were performed at BL03XU of SPring-8

(proposal Nos. 2020A7216; 2019B7267; 2019A7218)

constructed by the Consortium of Advanced Softmaterial

Beamline (FSBL) with the approval of the Japan Synchrotron

Radiation Research Institute (JASRI). The authors thank Dr

Taizo Kabe and Dr Hiroyasu Masunaga (JASRI, SPring-8) for

their assistance in the experiments on the BL03XU beamline.

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