Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 17, Issue 3, Pages 603-608Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532006000300027
Keywords
devulcanization; HNO3; oxidation
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This work describes the devulcanization of vulcanized SBR (Styrene Butadiene Rubber) based on controlled oxidation with nitric acid. IR, H-1 and C-13-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.
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