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Analytical considerations for determination of the microstructures of sulfur‐cured solution styrene − butadiene rubbers
Author(s) -
Choi SungSeen,
Kim Yeowool,
Kwon HyukMin
Publication year - 2017
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5318
Subject(s) - styrene butadiene , spectroscopy , fourier transform infrared spectroscopy , microstructure , copolymer , raw material , styrene , infrared spectroscopy , materials science , nuclear magnetic resonance spectroscopy , isomerization , proton nmr , analytical chemistry (journal) , polymer chemistry , chemistry , organic chemistry , chemical engineering , composite material , physics , polymer , catalysis , quantum mechanics , engineering
The 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