Monomer distributions and number‐average sequence lengths in hydrogenated butadiene–styrene copolymers from carbon‐13 nuclear magnetic resonance

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Abstract
Monomer distributions and number‐average sequence lengths are determined from 13C nuclear magnetic resonance (NMR) data for 1,4‐ and 1,2‐butadiene additions and styrene additions in a series of four hydrogenated butadiene–styrene copolymers. The monomer distribution is expressed in terms of the six unique days from which it is possible to calculate the number‐average sequence length of each monomer type. Carbon‐13 NMR spectral assignments are given and the techniques for making the assignments are discussed. The method presented could, in principle, be applied to any copolymer or terpolymer. Limitations that are encountered in the analysis of hydrogenated butadiene–styrene copolymers high in 1,2 additions are discussed.