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Influence of Copper Content and Ligand Type from the Precursor Solution Used forCopper-dialkyl-dithio-carbamate (CDDC) Treatment of Wood

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Radu Craciun, Pascal D. Kamdem, Craig McIntyre

Editorial: Holzforschung, 51(6), p.519-525, 1997.

Rezumat:

Copper dimethyl(diethyl) dithiocarbamate (CDDC) has been tested and proven to be an effective wood preservative. The following study was performed in order to understand the influence of copper content, ethanolamine type used in the Cu-precursor and the kind of alkyl dithiocarbamate ligand on the structure, crystallinity, penetration and bioefficiency of the CDDC. X-ray diffraction (XRD), environmental scanning electron microscopy (ESEM), leaching and fungus activity tests were used as tools for investigation of the CDDC treated wood. The results have shown that a 0.5% copper concentration in the Cu-complex solution used for wood treatment was enough for the formation of the CDDC crystallites and have the desired bioefficiency. The 2-ethanolamine (M-1), commonly used to prepare the Cu-precursor, can be successfully replaced by N-methyl-2-ethanolamine (M-2) or N,N-dimethyl-2-ethanolamine (M-3) and showed a better bioefficiency. XRD and ESEM data indicates the presence of CDDC-M(E) crystalline phase deposits on wood cell walls in the all cases. The particle size of the CDDC crystallites decreased significantly when the M-2 or M-3 solvents were used for Cu precursor preparation. The formatin of smaller crystallites determined a better CDDC penetration into the wood with consequences on the bioefficiency of the CDDC preservative. Regardless of the type of the amine used in the Cu-complex in the first step of CDDC-M (E) wood impregnation, the final chemical structure of the CDDC is not changed.

Cuvinte cheie: CDDC, FTIR, XRD, ESEM, XPS.