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Extra resources for Advances in Chemistry Research, volume 21
The y values thus evaluated would be a meaningful parameter to characterize CB aggregates. Similar Casson plots could be obtained for the other three suspensions. From the basic concept of the Casson model, such linearity provides a strong evidence of the presence of connected CB aggregate networks in the CB suspensions. 48 Yuji Aoki Figure 12. Flow curves of the CB-76/(PS/DBP) suspensions with different PS concentrations at 25C. Figure 13. Casson plots of the CB-76/(PS/DBP) suspensions with different PS concentrations at 25C.
Then, we discuss the properties in details. Lastly, we discuss the effects of the primary particle size and the aggregate structure of CB particles on the rheological properties. 2. 1. Samples Several kinds of CB samples supplied from Mitsubishi Chemical Corp. CB-76 (Furnace Black, mean particle size: 65 nm, average aggregate size (diameter): 230 nm, di-butyl phthalate (DBP) absorption value: 71 ml/100 g) was mainly used, because CB-76 has a relatively large primary particle size and low oil absorption value so that a rather small change in the medium affinity toward the CB particles can results in large changes in the agglomerate structure and rheology.
Thus the PS chains would have been partially adsorbed on the CB particles to increase moderately an affinity of the particle surface toward the PS/DBP matrix. Further details of this adsorption behavior will be explained in Section 4. Rheology of Carbon Black Suspensions 37 CB-76/(PS/DBP) 3 log tan δ 2 1 0 -1 -1 0 1 2 -1 log (ω/rad s ) Figure 4. Frequency dependence of the loss tangent, tan , of the CB-76/(PS/DBP) suspensions having various cCB. 11%; cf. Figure 3) at 30C. The symbols are the same as in Figure 3 .