Microstructures of a Hydrogenated Styrene-Butadiene Copolymer by 13C NMR |
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| Authors: | Nikhil K. Singha T. P. Mohandas |
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| Affiliation: | 1. Division of Polymer Chemistry, National Chemical Laboratory , Pune, 411008, India;2. DSM Research EP-NP , P.O. Box 18, 6160 MD, Geleen, The Netherlands;3. Division of Polymer Chemistry, National Chemical Laboratory , Pune, 411008, India |
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| Abstract: | Abstract The microstructure and sequence distribution of a styrene-ethylenebutene-1 copolymer obtained by quantitative hydrogenation of emulsion styrene-butadiene rubber (SBR) was determined using 13C NMR. The results show that the polymer has 82% (CH2)>6 units arising due to BBB', SBB and BBB triads (B = hydrogenated 1,4 butadiene, B' = butene-1 and S = styrene). The presence of long crystallizable methylene sequences results in a melting endotherm at 45°C for the hydrogenated SBR. |
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