INFRARED QUANTITATIVE STUDY OF ACETYLATION OF MICROSPHERES OF POLYSTYRENE

Fourier transform infrared spectroscopy has been used to study quantit atively the acetylation of monodisperse polystyrene microspheres with diameters ranging from 7 to 9 mu m. The CH2 stretching infrared vibrat ion mode at 2921 cm(-1) was used as the internal intensity standard. T he acetylation extent could be easily measured by comparing the relati ve intensities of the bands of acetyl group (1678, 1415, 1359 cm(-1)) or the bands due to the para-substituted benzene ring to the band at 2 921 cm(-1) from the calibration curve.