Vpliv UV svetlobe na les, zaščiten z bakrovimi pripravki : diplomsko delo (univerzitetni študij) = Influence of UV light on wood, impregnated with copper based preservatives : graduation thesis (university studies)
Kržišnik, Nikolaj
Z metodo elektronske paramagnetne resonance (EPR) smo proučevali, kaj se v lesu, zaščitenem z bakrovimi pripravki, dogaja s Cu(II) ter s samim lesom zaradi obsevanja z UV svetlobo. Merili smo tudi ...barvne spremembe impregniranih in neimpregniranih vzorcev, ki so bili posledica UV obsevanja. V raziskavi smo uporabili vzorce smreke (Picea abies), ki smo jih vakuumsko impregnirali s 3 pripravki in sicer z bakrovim (II) oktanoatom z etanolaminom, bakrovim(II) sulfatom in z etanolaminom. Ugotovili smo, da pod vplivom UV žarkov poteče pretvorba Cu(II) v Cu(I), in da baker v impregnacijskih sredstvih deluje zaščitno proti UV svetlobi. Vlaženje je v lesu pospešilo reakcije pretvorbe Cu(II) v Cu(I). Impregnirani, obsevani vzorci lesa so potemneli, pordeli in porumeneli. Rezultati so pokazali, da med barvnimi spremembami vzorcev ter spremembami intenzitet EPR signalov Cu(II) in prostih radikalov v vzorcih, obsevanih z UV svetlobo, obstoja korelacija. Večja sprememba barve vzorcev je povezana z večjo količino nastalih prostih radikalov.
Type of material - undergraduate thesis
; adult, serious
Publication and manufacture - Ljubljana : [N. Kržišnik], 2001
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