Abstract
AbstractThe microstructures of solution styrene − butadiene copolymer (S‐SBR) vulcanizates were analyzed using liquid H NMR spectroscopy and transmission Fourier transform IR spectroscopy, and the results were compared with the raw S‐SBRs. The microstructures of the cured and raw S‐SBRs were different because of the pendent group formed by the cure accelerator and cis − trans isomerization. The styrene and trans‐1,4‐unit contents of the cured S‐SBRs were larger than those of the raw S‐SBRs, whereas the 1,2‐unit contents of the cured S‐SBRs were on the whole smaller than those of the raw S‐SBRs. The results of NMR and IR spectroscopy were also compared. Considering the analytical error ranges and consistency of the analysis results, a proper analytical method and process are suggested. NMR analysis results had narrower error ranges and better correlation than IR spectroscopy results. It was was found to be acceptable that the cis‐1,4‐unit contents were obtained by subtracting the trans‐1,4‐unit contents from the 1,4‐unit contents determined by NMR analysis. © 2017 Society of Chemical Industry
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