3.7. DSC
Tg was measured according to the change in HNBR content. Tg decreased and low temperature character improved with an increase in HNBR content. In particular, Tg decreased sharply with the 60:40 blend, because of the synergistic effect as HNBR blend content was increased.
3.8. Surface dispersion
Figs. 13 and 14 show the surface dispersion image at 1000 according to changes in the HNBR blend content. Fig. 13 shows a phase separation phenomenon in the blended sample, whereas Fig. 14 does not, because the surface tension of FKM was higher than that of HNBR. The FKM and HNBR blend effect developed by adding a compatibilizer. Adding a reinforcing agent (VN2) increased dispersion than it was not added.