Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene
CNSL is a mixture of meta-alkylphenols with variable degree of unsaturation attached to the benzene ring. The kinetic study of the thermal degradation at 140 degreesC of synthetic cis-1,4-polyisoprene film, in the presence of technical CNSL and some derivatives (cardanol, hydrogenated cardanol and a...
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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 |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000200008 |
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| author | Rodrigues Francisco Helder A. Feitosa Judith P. A. Ricardo Nágila M. P. S. França Francisco Célio F. de Carioca José Oswaldo B. |
| author_facet | Rodrigues Francisco Helder A. Feitosa Judith P. A. Ricardo Nágila M. P. S. França Francisco Célio F. de Carioca José Oswaldo B. |
| author_sort | Rodrigues Francisco Helder A. |
| collection | DOAJ |
| description | CNSL is a mixture of meta-alkylphenols with variable degree of unsaturation attached to the benzene ring. The kinetic study of the thermal degradation at 140 degreesC of synthetic cis-1,4-polyisoprene film, in the presence of technical CNSL and some derivatives (cardanol, hydrogenated cardanol and alkylated hydrogenated cardanol) was carried out by FTIR. The amount of OH/OOH and C=O formed and also of C=C consumed during the degradation was determined. All materials increase the induction period and decrease the apparent rate constants of thermal-oxidation. Based on kinetic parameters, the order of antioxidant activity was: CNSL >> cardanol <FONT FACE=Symbol>@</FONT> hydrogenated and alkylated cardanol > hydrogenated cardanol. The effect of CNSL could be attributed to the extra contribution of the other components besides cardanol and to the unsaturation on the long side chain. This greater activity is important because CNSL is much more cost effective than its derivatives. |
| first_indexed | 2024-04-12T07:47:39Z |
| format | Article |
| id | doaj.art-5855199eb8394444981a865662253b58 |
| institution | Directory Open Access Journal |
| issn | 0103-5053 1678-4790 |
| language | English |
| last_indexed | 2024-04-12T07:47:39Z |
| publishDate | 2006-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Journal of the Brazilian Chemical Society |
| spelling | doaj.art-5855199eb8394444981a865662253b582022-12-22T03:41:40ZengSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society0103-50531678-47902006-01-01172265271Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisopreneRodrigues Francisco Helder A.Feitosa Judith P. A.Ricardo Nágila M. P. S.França Francisco Célio F. deCarioca José Oswaldo B.CNSL is a mixture of meta-alkylphenols with variable degree of unsaturation attached to the benzene ring. The kinetic study of the thermal degradation at 140 degreesC of synthetic cis-1,4-polyisoprene film, in the presence of technical CNSL and some derivatives (cardanol, hydrogenated cardanol and alkylated hydrogenated cardanol) was carried out by FTIR. The amount of OH/OOH and C=O formed and also of C=C consumed during the degradation was determined. All materials increase the induction period and decrease the apparent rate constants of thermal-oxidation. Based on kinetic parameters, the order of antioxidant activity was: CNSL >> cardanol <FONT FACE=Symbol>@</FONT> hydrogenated and alkylated cardanol > hydrogenated cardanol. The effect of CNSL could be attributed to the extra contribution of the other components besides cardanol and to the unsaturation on the long side chain. This greater activity is important because CNSL is much more cost effective than its derivatives.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000200008CNSLphenolpolyisoprenethermal oxidationantioxidant |
| spellingShingle | Rodrigues Francisco Helder A. Feitosa Judith P. A. Ricardo Nágila M. P. S. França Francisco Célio F. de Carioca José Oswaldo B. Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene Journal of the Brazilian Chemical Society CNSL phenol polyisoprene thermal oxidation antioxidant |
| title | Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene |
| title_full | Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene |
| title_fullStr | Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene |
| title_full_unstemmed | Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene |
| title_short | Antioxidant activity of cashew nut shell liquid (CNSL) derivatives on the thermal oxidation of synthetic cis-1,4-polyisoprene |
| title_sort | antioxidant activity of cashew nut shell liquid cnsl derivatives on the thermal oxidation of synthetic cis 1 4 polyisoprene |
| topic | CNSL phenol polyisoprene thermal oxidation antioxidant |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000200008 |
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