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Higroskopnost in dimenzijska stabilnost lesa modificiranega z derivatom imidazola : diplomsko delo
Bižal, Uroš (Author), Pohleven, Franc (Mentor) More about this mentor... This link opens in a new window, Gorišek, Željko (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/vs_bizal_uros.pdf This link opens in a new window

Abstract
Preučili smo možnost kemične modifikacije bukovine (Fagus sylvatica L.), beljave smrekovine (Picea abies Karst.) ter beljave borovine (Pinus sylvestris L.) s sredstvom, katerega glavna komponenta je derivat imidazola - dihidroksidimetiloletilen sečnina (DMES). Modifikacijo smo izvedli z dvema različnima koncentracijama sredstva (5 in 20 %) pri dveh temperaturah modifikacije (150 in 170 °C). Potek reakcije in stopnjo modifikacije smo ovrednotili z odstotnim povečanjem mase (WPG). Določili smo razliko v ravnovesni vlažnosti modificiranih in kontrolnih vzorcev ter vpliv modifikacije na dimenzijsko stabilnost vzorcev (ASE). Preučili smo tudi vpliv parametrov procesa modifikacije na izpiranje sredstva iz modificiranih vzorcev(SIST EN 84) . Optimalen postopek modifikacije je postopek z 20 % raztopino sredstva (čeprav ni velikih odstopanj v primerjavi s 5 % raztopino) pri temperaturi 170 °C. Z navedenim postopkom dosežemo najmanjše izpiranje sredstva, kar kaže na to, da je premreženje pri temperaturi 170 °C boljše kot pri temperaturi 150 °C. S to metodo modifikacije smo dosegli boljšo dimenzijsko stabilnost in nižjo ravnovesno vlažnost modificiranih vzorcev v primerjavi s kontrolnimi vzorci.

Language:Slovenian
Keywords:modifikacija lesa, DMES, WPG, dimenzijska stabilnost, ASE
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2008
Publisher:[U. Bižal]
Number of pages:IX, 45 f.
Place:Ljubljana
UDC:630*841.1
COBISS.SI-ID:1689481 Link is opened in a new window
Views:670
Downloads:243
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Secondary language

Language:English
Abstract:
Thesis investigates possibility for chemical modification of beech, spruce sapwood and pine with an agent, the main component of which is imidazol derivative - dimethyloldihydroxyethyleneurea (DMDHEU). Two different concentrations of agent (5 and 20 %) at two reaction temperatures (150 and 170°C) were used for modification. Reaction process and degree of modification were evaluated by weight percent gain (WPG). Differences in equilibrium moisture contents between modified and control samples and antishrinking efficency (ASE) were determined. Influence of modification process on leachability (SIST EN 84) of the modified samples was also investigated. Optimal results were achieved with 20 % solution and 170 °C. By the stated parameters the highest rate of agent crosslinking was observed. By this modification method we achieved better dimension stability and lower equilibrium moisture contents of modified samples compared to control samples.

Keywords:wood modification, DMHEU, WPG, dimensional stability, ASE

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