Graft polymerization in radiation processing is a remarkable technique for both chemical and physical properties modification of a polymer chain to the desired function-based polymer. In this study, modification of waste tire dust (WTD) by radiation-induced graft polymerization (RIGP) of tri-(propylene glycol) diacrylate (TPGDA) monomer was successfully prepared using electron beam irradiation at a varying amount of absorbed dose ranging from 20 kGy to 100 kG. Conventionally, the grafting yield of the monomer onto the polymer is measured by the difference of initial and final weight of the monomer during the grafting process. However, in this paper, Fourier Transform Infrared Spectroscopy (FTIR) was used to quantify the amount of TPGDA successfully grafted onto WTD. The results obtained were in correlation with Beer-Lambert's equation. The highest relative amount of grafted monomer achieved (39.14) at an absorbed dose of 60 kGy. The existence of grafted TPGDA monomer on WTD was confirmed by the presence of the carbonyl group at adsorption band of 1725 cm-1
