An infrared method for the analysis of composition in copolymers of ethylene with small amounts of propylene is described. It is based on the ratio between the absorbance of the 7.25 μ band and the product of the absorbance by the half‐width of the 6.85 μ band. Spectra are recorded on molten samples to minimize crystallinity effects. The results obtained by this method are in good agreement with those found by means of the near‐infrared method by BUCCI and SIMONAZZI.
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Tosi et al. (1973) studied this question.
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