NONDESTRUCTIVE QUANTITATIVE-ANALYSIS OF ETHYLENE-PROPYLENE BLEND POLYMER BY THE NIR/ATR/FT-IR METHOD

The attenuated total reflectance Fourier transform infrared (ATR/FT-IR) method in the near-infrared region was found to provide a novel opportunity for nondestructive analysis of ehtylene-propylene (EP) blend polymer. The absorption due to the overtone of the C-H stretching vibration at approximately 5900 cm-1 was utilized to determine the ratio of two monomer units, the ethylene and propylene units, of the blend polymer, since the overlapping of CH3- and -CH2- is not so probibitive as in the case of the fundamental C-H stretching vibration at approximately 2900 cm-1. The wellk-known disadvantage of the weak intensity of the overtone absorption, however, was overcome by the choice of the high-sensitivity FT-IR technique.