A new functionalized fullerene derivative [60]fullerene poly(3-azidomethyl-3-methyl oxetane) (C 60 -PAMMO) was synthesized for the first time using a modified Bingel reaction of [60]fullerene (C 60 ) and bromomalonic acid poly(3-azidomethyl-3-methyl oxetane) ester (BM-PAMMO). The product was characterized by Fourier transform infrared (FTIR), ultraviolet-visible (UV-vis), and nuclear magnetic resonance (NMR) spectroscopy analyses. Results confirmed the successful preparation of C 60 -PAMMO. Moreover, the thermal decomposition of C 60 -PAMMO was analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis coupled with infrared spectroscopy (TG-IR), and in situ FTIR. C 60 -PAMMO decomposition showed a three-step thermal process. The first step at approximately 150 °C was related to the cycloaddition of azido groups (-N 3 ) with [60]fullerene. The second step was ascribed to the remainder decomposition of the PAMMO main chain at approximately 230 °C. The final step was attributed to the burning decomposition of amorphous carbon, the main chain, N-heterocyclic and carbon cage at around 510 °C.