Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9953416 | Polymer Degradation and Stability | 2018 | 18 Pages |
Abstract
Thermal degradation of deproteinized natural rubber (DPNR) was investigated by heating at 70â¯Â°C and 150â¯Â°C for 24â¯h, which was compared with thermal oxidative degradation of natural rubber (NR). The DPNR was prepared by incubation of the NR latex with urea and sodium dodecyl sulfate at room temperature for an hour followed by centrifugation. FT-IR, 1H NMR and 13C NMR measurements revealed significant differences between DPNR and NR after degradation at 150â¯Â°C; that is, cis-1,4-isoprene units of the DPNR isomerized to trans-1,4-isoprene units and vinyl groups, whereas those of NR reacted with oxygen radical and hydroxyl radical generated functional groups. The difference was attributed to an existence of proteins present in the nanomatrix structure, which adsorbed oxygen and water.
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Authors
Yoshimasa Yamamoto, Siti Nadiah Binti Norulhuda, Phan Trung Nghia, Seiichi Kawahara,