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A Discussion for the dispersion/aggregation of silica or carbon black particles

Yamaguchi, Daisuke; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*

Using a combined ultra-small-angle and small-angle scattering (CSAS) method, we characterized hierarchical structures of silica and/or carbon black filler particles dispersed in solution polymerized poly(styrene-random-butadiene) rubber (SBR). Two types of SBR were employed for the preparation of filler/rubber compounds; one possesses a newly developed functionalized chain-end (f-SBR), which has an affinity for filler particles and the other is a conventional SBR (n-SBR) without any special interaction with fillers. CSAS measurements clarified that the average-size of aggregated fillers dispersed in f-SBR matrix is smaller than that dispersed in n-SBR matrix. In addition, those aggregated fillers either in f-SBR or in n-SBR exhibited their own mass-fractal dimensions in their higher-order structures.

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