3.3.3. The Thermal Gravimetric Analysis. All samples are measured in nitrogen environment, which means no
oxygenolysis of polymer molecules and that it well proves the effect of the bridge molecule, PMMA. Adding SiO2-
PMMA nanoparticles can enhance the thermal stability of composites. The main thermal decomposition of NR
matrix is at about 360◦C (Figure 8) where C–C chain bonds ruptured and hydrogen transferred [35]. The degradation
curve of NR-PMMA/SiO2-PMMA is slightly shifted to a higher temperature, compared with the other samples, due
to the intertwining between one PMMA chain on the surface of nanosilica and another PMMA chain grafted on NRmolecules