Effect of Functionalization of Carbon Black on Rubber Properties

hydrocarbon polymers can be obtained by comparing the adsorption energies <strong>of</strong> polymer
analogs on the filler surfaces. Shown in Figure 7 are the adsorption free energies <strong>of</strong>
heptane, a model compound for hydrocarbon polymers, measured by inverse gas
chromatography (IGC).
The results for both CSDPF 2000 and 4000 are presented along with those <strong>of</strong> blends <strong>of</strong>
carbon black N234 and silica. Regardless <strong>of</strong> the difference in surface areas, at the same
silica contents, the silica-containing fillers give significantly higher adsorption energies.
The lower filler-filler interaction <strong>of</strong> CSDPF 2000 and 4000 can be demonstrated by the
Silica
N234
60
50
40
30
20
10
0
-∆ G°, kJ/mol
9
Section A-A
Figure 6. General views <strong>of</strong> CSDPF 2000 and CSDPF 4000
CSDPF 2000
CSDPF 4000
Heptane, 180°C
CB+Silica
CSDPF 4000
CSDPF 2000
0 20 40 60 80 100
100 80 60 40 20 0
Figure 7. adsorption energies <strong>of</strong> heptane at 180°C on a variety <strong>of</strong> fillers
%