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| Format: | Artículo científico |
| Language: | en |
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Universidad Distrital Francisco José de Caldas
2014
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| Online Access: | https://www.redalyc.org/articulo.oa?id=423939621008 |
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Table of Contents:
- CHEMICAL MODIFICATION OF Calophyllum brasiliense Cambess. AND Enterolobium cyclocarpum (Jacq.) Griseb. WOOD Ernesto Blanco Johnny Alfaro Agrociencias Acetylation acetic anhydride Tropical hardwood chemical modification Wood samples of two tropical hardwood species,Cedar Mary (Calophyllum brasiliense Cambess.) and Guanacaste (Enterolobium cyclocarpum (Jacq.)Griseb.), growing in Costa Rica were chemicallymodified by acetylation. Acetic anhydride wasused as reagent and donor of the acetyl group, potassium carbonate as a catalyst and N,N-dimethyl form a mide (DMF) as a solvent. The reaction wascarried out at 90° C and three reaction times were studied in order to determine the percentage weightgain (PWG) for every treatment. For the seven hour reaction, PWG was 12.88 % and 12.44 % for Guanacaste and Cedar Mary samples respectively.IR spectra using ATR technology were obtained inorder to corroborate the reaction. Results showed characteristic signals of functional groups C = O(1737 cm-1), C-O (1220 cm-1) and C-H bending vibration for the acetyl group (1368 cm-1), whichindicates that hydroxyl groups had been replaced by acetyl groups. Longer reaction times increasethis replacement in both species. 2014 artículo científico 0120-0739 https://www.redalyc.org/articulo.oa?id=423939621008 en http://www.redalyc.org/revista.oa?id=4239 Colombia Forestal application/pdf Universidad Distrital Francisco José de Caldas Colombia Forestal (Colombia) Num.1 Vol.17