The presence of absorbance bands at 3368 and 1525 cm -1 confirmed IPDI incorporation (corresponding to stretching vibrations of N-H in urethane groups). The band at 1643 cm -1 corresponding to stretching vibration of C=C, confirmed the presence of HEMA. Additionally, the bands at 2921 and 2853 cm -1 correspond to stretching vibrations of C-H in -CH2 and -CH3. The band 1732 cm -1 is characteristic for stretching of C=O in ester bonds of the polyester diol, urethane and methacrylic groups.