2014
DOI: 10.1039/c4ra03682d
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Microstructural analysis and cis–trans isomerization of BR and SBR vulcanizates reinforced with silica and carbon black using NMR and IR

Abstract: SBR is composed of styrene, 1,2-unit, cis-1,4-unit, and trans-1,4-unit. Rubber chains were extracted from cured butadiene rubber (BR) and styrene-butadiene rubbers (SBRs) reinforced with silica and carbon black using o-dichlorobenzene, followed by coagulation to analyze their microstructures by nuclear magnetic resonance spectroscopy (NMR) and infrared spectroscopy (IR). Microstructures of the raw and cured samples were compared and their differences were discussed. The styrene contents of cured samples were g… Show more

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Cited by 21 publications
(19 citation statements)
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“…The principal peaks related to the hydrogens bonded to the carbon − carbon double bond (C = C) are marked in the H NMR spectra. Three regions of 4.3 − 5.0 (1,2‐unit, H 2 C = C∼), 5.0 − 6.1 (∼C H = C H ∼ of 1,4‐unit and ∼ C = C H ∼ of 1,2‐unit) and 6.1 − 7.7 ppm (aromatic hydrogens of styrene and CHCl 3 ) were integrated for determination of the 1,2‐unit, 1,4‐unit and styrene contents . The peaks at 0.5 − 3.0 ppm correspond to hydrogens of saturated hydrocarbons such as ∼ CH 3 , ∼CH 2 ∼ and ∼ CH∼.…”
Section: Resultsmentioning
confidence: 99%
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“…The principal peaks related to the hydrogens bonded to the carbon − carbon double bond (C = C) are marked in the H NMR spectra. Three regions of 4.3 − 5.0 (1,2‐unit, H 2 C = C∼), 5.0 − 6.1 (∼C H = C H ∼ of 1,4‐unit and ∼ C = C H ∼ of 1,2‐unit) and 6.1 − 7.7 ppm (aromatic hydrogens of styrene and CHCl 3 ) were integrated for determination of the 1,2‐unit, 1,4‐unit and styrene contents . The peaks at 0.5 − 3.0 ppm correspond to hydrogens of saturated hydrocarbons such as ∼ CH 3 , ∼CH 2 ∼ and ∼ CH∼.…”
Section: Resultsmentioning
confidence: 99%
“…Figure shows the IR spectra of the raw and cured S‐SBR10 as representative. The peaks at 699, 724, 911 and 967 cm −1 were assigned to the styrene, cis ‐1,4‐unit, 1,2‐unit and trans ‐1,4‐unit, respectively …”
Section: Resultsmentioning
confidence: 99%
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“…For cured SBRs (SBR vulcanizates), however, organic materials remaining in a sample must be eliminated, and crosslinked rubber chains have to be decrosslinked and extracted for NMR analysis. Also, NMR analysis results of cured SBRs show different microstructure from the raw SBRs because of formation of pendent groups and cis-trans conversion [18]. Pyrolysis techniques such as pyrolysis-gas chromatography (Py-GC) and prolysis-gas chromatography/mass spectrometry (Py-GC/MS) are also useful techniques for polymer analysis [19e26].…”
Section: Introductionmentioning
confidence: 99%