The FT-IR spectra of the original crumb rubber and modified crumb rubber are shown in Fig. 6. It shows that multiple bands appear at 1650 1450 cm1 for the original crumb rubber, indicating the existence of C@C or benzene ring. Two strong bands appear at 800 900 cm1 represent C–H bond stretching connecting to carbon-carbon double bond. In the FT-IR spectra of the modified crumb rubber, there are some new bands appeared. Obvious bands appear near 3430 cm1 and 1730 cm1 for the O–H and C@O stretching vibration that are associated with the rubber surface