Infrared Analysis of Butadiene Polymers

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Abstract
Whereas older methods for the determination of 1,2-, cis-1,4 and trans-1,4 units in high polymers require pure olefins as calibration substances, this is no longer necessary with the newly developed method which is described in this paper. From 3 different polymer samples 3 dilution series are prepared and the infrared spectra are recorded. The extinction coefficients are extrapolated to c=0 by a modified base line procedure and the resulting operational extinction coefficients are coupled mathematically (determinants) to yield the actual extinction coefficients of the pure isomers. These may be expressed as mole per cent of the isomeric units for the individual polymer samples. The procedure described may also be applied to other chemical mixtures without the need for pure calibration substances.

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