Abstract

The importance of the correct polymer absorptivities for determining the microstructures of polybutadienes and polyisoprenes, particularly when one component is present in large amount, is shown. A method is described for determining both the major and minor polymer absorptivities and an application to the analyses of butadiene–isoprene copolymers is given. The absorptivities of <i>cis</i>- and <i>trans</i>-C(CH₃)=CH at 890 cm⁻¹, <i>cis</i>- and <i>trans</i>-C(CH₃)=CH at 1155 cm⁻¹ and 1130 cm⁻¹, and of <i>cis</i>-CH=CH at 967 cm⁻¹ are discussed.

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