Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote
<abstract language="eng">This study has shown that Eucalyptus tar and creosote can be used in phenolic adhesive formulations (resols) for wood products bonding. Some adhesives were prepared substituting 0; 17.7; 35.0 and 67.0% of the phenol by anhydrous tar and 0; 15.0 e 28.5% by cre...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Sociedade Brasileira de Química
1997-08-01
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| Series: | Química Nova |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421997000400005 |
| _version_ | 1811324155546566656 |
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| author | Alexandre Santos Pimenta Benedito Rocha Vital Fred Yukio Fujiwara |
| author_facet | Alexandre Santos Pimenta Benedito Rocha Vital Fred Yukio Fujiwara |
| author_sort | Alexandre Santos Pimenta |
| collection | DOAJ |
| description | <abstract language="eng">This study has shown that Eucalyptus tar and creosote can be used in phenolic adhesive formulations (resols) for wood products bonding. Some adhesives were prepared substituting 0; 17.7; 35.0 and 67.0% of the phenol by anhydrous tar and 0; 15.0 e 28.5% by creosote. In gluing Brazilian pine veneers, eucalypt tar and creosote based adhesives required longer pressing times for curing than conventional phenol-formaldehyde adhesives. By using 13C NMR, the number of carbons in side chains and hydroxyl, carbonyl, carboxyl and methoxyl groups related to 100 aromatic rings could be estimated in tar and creosote. In creosote, after reaction with excess formaldehyde in alkaline medium, only 0,28 hydroxymethyl groups was detected per phenolic ring. This low amount of hydroxymethylation explains the lack of reactivity in curing observed when creosote was introduced in a standard adhesive formulation. |
| first_indexed | 2024-04-13T14:09:16Z |
| format | Article |
| id | doaj.art-d435fd3747884a3bb269a6bbedad55f9 |
| institution | Directory Open Access Journal |
| issn | 0100-4042 1678-7064 |
| language | English |
| last_indexed | 2024-04-13T14:09:16Z |
| publishDate | 1997-08-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-d435fd3747884a3bb269a6bbedad55f92022-12-22T02:43:50ZengSociedade Brasileira de QuímicaQuímica Nova0100-40421678-70641997-08-0120436537110.1590/S0100-40421997000400005Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosoteAlexandre Santos PimentaBenedito Rocha VitalFred Yukio Fujiwara<abstract language="eng">This study has shown that Eucalyptus tar and creosote can be used in phenolic adhesive formulations (resols) for wood products bonding. Some adhesives were prepared substituting 0; 17.7; 35.0 and 67.0% of the phenol by anhydrous tar and 0; 15.0 e 28.5% by creosote. In gluing Brazilian pine veneers, eucalypt tar and creosote based adhesives required longer pressing times for curing than conventional phenol-formaldehyde adhesives. By using 13C NMR, the number of carbons in side chains and hydroxyl, carbonyl, carboxyl and methoxyl groups related to 100 aromatic rings could be estimated in tar and creosote. In creosote, after reaction with excess formaldehyde in alkaline medium, only 0,28 hydroxymethyl groups was detected per phenolic ring. This low amount of hydroxymethylation explains the lack of reactivity in curing observed when creosote was introduced in a standard adhesive formulation.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421997000400005tar and creosote from eucalyptwood adhesives13C-NMR spectroscopy |
| spellingShingle | Alexandre Santos Pimenta Benedito Rocha Vital Fred Yukio Fujiwara Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote Química Nova tar and creosote from eucalypt wood adhesives 13C-NMR spectroscopy |
| title | Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote |
| title_full | Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote |
| title_fullStr | Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote |
| title_full_unstemmed | Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote |
| title_short | Alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira Wood adhesives from eucalyptus tar and creosote |
| title_sort | alcatrao ou creosoto de eucalipto na producao de adesivos fenolicos para colagem de madeira wood adhesives from eucalyptus tar and creosote |
| topic | tar and creosote from eucalypt wood adhesives 13C-NMR spectroscopy |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421997000400005 |
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