alcatrão ou creosoto de eucalipto na produção de adesivos fenólicos para colagem de madeira wood adhesives from eucalyptus tar and creosote

Clicks: 175
ID: 148648
1997
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Abstract
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.
Reference Key
pimenta1997qumicaalcatro Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Alexandre Santos Pimenta;Benedito Rocha Vital;Fred Yukio Fujiwara
Journal greece and rome
Year 1997
DOI
10.1590/S0100-40421997000400005
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421997000400005
Keywords
13c-nmr spectroscopychemistry

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