ABSTRACT
The formation of hydrogen bonding in polyurethane is generally known to have a major effect on its morphology and overall properties (Yen et al. 1999, Luo et al. 1997, Yoon and Han 2000, Heintz et al. 2002, Teo et al. 1997). The primary bands in polyurethane, the N-H stretching as a proton donor, and the carbonyl stretching as a proton acceptor are sensitive to hydrogen bonding. Therefore, the formation of hydrogen bonds is characterized by the shift of the Fourier transform infrared (FTIR) absorbance peak to a lower frequency. The strength of hydrogen bonding can be quantižed by the magnitude of the shift (Yen et al. 1999, Luo et al. 1997, Yoon and Han 2000, Chen et al. 2000, Brunette et al. 1982).
