Table 3. For unmodified SBR and samples containing poly(methyl methacrylate),
SBR-12M, SBR-25M, SBR-50M, the Tg was −52 °C and
−50 °C, respectively. The samples containing both poly(methyl
methacrylate) and silica, showed Tg values ranging from −56 °C to
−50 °C. The results do not show significant variations of Tg that can
be attributed to alteration in themobility of the rubber chain segments