Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation
This work describes the devulcanization of vulcanized SBR (Styrene Butadiene Rubber) based on controlled oxidation with nitric acid. IR, ¹H and 13C-NMR, CHN elemental analyses, TG, GPC and TPD-MS (Temperature Programmed Decomposition-Mass Spectrometry) experiments suggest that nitric acid promotes t...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2006-01-01
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| Series: | Journal of the Brazilian Chemical Society |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000300027 |
| _version_ | 1818130387455442944 |
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| author | Rios Rachel R.V.A. Gontijo Manuela Ferraz Vany P. Lago Rochel M. Araujo Maria Helena |
| author_facet | Rios Rachel R.V.A. Gontijo Manuela Ferraz Vany P. Lago Rochel M. Araujo Maria Helena |
| author_sort | Rios Rachel R.V.A. |
| collection | DOAJ |
| description | This work describes the devulcanization of vulcanized SBR (Styrene Butadiene Rubber) based on controlled oxidation with nitric acid. IR, ¹H and 13C-NMR, CHN elemental analyses, TG, GPC and TPD-MS (Temperature Programmed Decomposition-Mass Spectrometry) experiments suggest that nitric acid promotes two processes: (i) devulcanization by oxidation of the sulfide crosslinks and (ii) oxidation of the carbon framework leading to the formation of -COOH and -NO2 groups. Under aggressive conditions (HNO3, reflux) the polymer chain is strongly oxidized and fragmented to a highly oxygenated low molecular weight fraction, which is soluble in water. |
| first_indexed | 2024-12-11T08:04:14Z |
| format | Article |
| id | doaj.art-6c7711959ec34e429f97959dab88c73f |
| institution | Directory Open Access Journal |
| issn | 0103-5053 1678-4790 |
| language | English |
| last_indexed | 2024-12-11T08:04:14Z |
| publishDate | 2006-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Journal of the Brazilian Chemical Society |
| spelling | doaj.art-6c7711959ec34e429f97959dab88c73f2022-12-22T01:15:01ZengSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society0103-50531678-47902006-01-01173603608Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidationRios Rachel R.V.A.Gontijo ManuelaFerraz Vany P.Lago Rochel M.Araujo Maria HelenaThis work describes the devulcanization of vulcanized SBR (Styrene Butadiene Rubber) based on controlled oxidation with nitric acid. IR, ¹H and 13C-NMR, CHN elemental analyses, TG, GPC and TPD-MS (Temperature Programmed Decomposition-Mass Spectrometry) experiments suggest that nitric acid promotes two processes: (i) devulcanization by oxidation of the sulfide crosslinks and (ii) oxidation of the carbon framework leading to the formation of -COOH and -NO2 groups. Under aggressive conditions (HNO3, reflux) the polymer chain is strongly oxidized and fragmented to a highly oxygenated low molecular weight fraction, which is soluble in water.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000300027devulcanizationHNO3oxidation |
| spellingShingle | Rios Rachel R.V.A. Gontijo Manuela Ferraz Vany P. Lago Rochel M. Araujo Maria Helena Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation Journal of the Brazilian Chemical Society devulcanization HNO3 oxidation |
| title | Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation |
| title_full | Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation |
| title_fullStr | Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation |
| title_full_unstemmed | Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation |
| title_short | Devulcanization of styrenebutadiene (SBR) waste tire by controlled oxidation |
| title_sort | devulcanization of styrenebutadiene sbr waste tire by controlled oxidation |
| topic | devulcanization HNO3 oxidation |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000300027 |
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