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| Titel: |
Brightness Reversion of Mechanical Pulps VIII: Fate of Dienic Additives During Brightness Reversion of High-Yield Pulp |
| Auteur: |
Harvey, L. C. Cook, C. Ragauskas, A. J. |
| Verschenen in: |
Journal of wood chemistry and technology |
| Paginering: | Jaargang 17 (1997) nr. 1-2 pagina's 27-39 |
| Jaar: |
1997-02-01 |
| Inhoud: |
The photostabilization mechanism of 1,4-dihydro-2-methylbenzoic acid was examined with a lignin model compound in solution and on BCTMP pulp. Photodegradation of 3,4-dimethoxy-α-(2'-methoxyphenoxy)-acetophenone (1), dissolved in benzene, was shown not to be influenced by the addition of the diene additive, suggesting that the additive does not influence the initial photochemistry of lignin model compound 1. Product analysis indicated that the addition of the diene additive enhanced formation of 3,4-dimethoxyacetophenone, one of the principal products formed from photofragmentation of compound 1. These results were attributed to hydrogen donation from the diene to the phenacyl radical. Photolysis of 1,4-dihydro-2-methylbenzoic acid impregnated on BCTMP test sheets revealed a gradual conversion of the diene additive into o-toluic acid; this reaction was attributed to a hydrogen donation mechanism. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 13 gevonden artikelen
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