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Patiniranje bukovega lesa [Elektronski vir] = Patination of beech woodTomažič, Miro ...Postopek, s katerim lahko spremenimo naravno barvo lesa, se imenuje luženje. Posebna zvrst luženja je dimljenje. Pri dimljenju les za določen čas izpostavimo param amoniaka ali različnih aminov. ... Rezultat je kemijska reakcijapolimerov lesa (hemiceluloza, celuloza, lignin) in/ali ekstraktivov z amini, posledica pa obarvanost, ki je podobna barvi naravno staranega lesa. Zato postopek dimljenja uporabljamo tudi za patiniranje lesa. Les bukve (Fagussylvatica L.) smo za določen čas izpostavili param amoniaka ali ga premazali z vodnimi raztopinami amoniaka, etanolamina ali trietanolamina. S kolorimetrom smo merili barvo tako luženega lesa, kemijske spremembe na površini luženih vzorcev pa smo spremljali z metodo nihajne (FT-IR) spektroskopije. Ugotovili smo, da lahko za temnenje površine lesa oz. za patiniranje agresivni amoniak nadomestimo z uporabniku prijaznejšima etanolaminom in trietanolaminom. Kot kaže, so v kemijski reakciji lesa s preiskovanimi snovmi za luženje udeležene predvsem karbonilne skupine hemiceluloze in funkcionalne skupine ligninskega sistema. Da bi ugotovili, kako na kemijsko reakcijo luženja vplivajo ekstraktivi, smo poskus izvedli tudi na bukovini, ki smo jo ekstrahirali z vodo in organskimi topili. Ugotovili smo, da ekstrahirana bukovina sčasoma bolj potemni kot neekstrahirana oziroma da je prisotnost ekstraktivov pri reakcijah z amini pomembna. Vendar pa kemijskih sprememb ekstraktivov zaradi dimljenja z FT-IR tehniko nismo zaznaliSource: Zbornik referatov s posvetovanja [Elektronski vir] (F. 1-9)Type of material - conference contributionPublish date - 2003Language - slovenianCOBISS.SI-ID - 1082505
Author
Tomažič, Miro |
Kričej, Borut |
Nagode, Gregor |
Pavlič, Matjaž |
Rep, Gregor |
Petrič, Marko, 1962-
Topics
luženje lesa |
dimljenje |
FT-IR spektri |
amoniak
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Tomažič, Miro | 22610 |
Kričej, Borut | 17846 |
Nagode, Gregor | ![]() |
Pavlič, Matjaž | 20386 |
Rep, Gregor | 20964 |
Petrič, Marko, 1962- | 00395 |
Source: Personal bibliographies
and: SICRIS
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