AbstractAn infrared band asymmetry method involving use of integrated infrared band intensities was devised for the measurement of stereoregularity differences in polypropylene resins. A simple digital readout apparatus was attached to a high resolution infrared spectrophotometer, and a computer program was written to calculate the integrated band intensities from the digital data. Comparison of this method with others based on crystallinity measurements of the isotactic portion and on solvent extraction techniques for measurement of the atactic portion demonstrated its sensitivity for the stereoblock portion of the polypropylene resin. A polypropylene resin which was fractioned by a temperature‐controlled sequential extraction was examined by this band asymmetry method and the results reporte
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