Opazovanje in karakterizacija prostih radikalov v lesu z metodo lovljenja radikalov
Humar, Miha ; Petrič, Marko ; Šentjurc, Marjeta
UV žarki v lesu povzročajo nastanek prostih radikalov. Le ti sprožijo depolimerizacijo celuloze in ostalih polioz kot tudi lignina. Proste radikale,ki smo jih ujeli z lovilcem radikalov DePMPO smo ...skušali okarakterizirati z metodo elektronske paramagnetne resonance (EPR). Metoda se je izkazala kot zelo uspešna. V lesu, obsevanem z UV žarki, smo opazili tri vrste radikalov: hidroksilne, ogljikove in peroksidne. Z računalniško simulacijo smo izračunali relativne intenzitete signalov posameznih komponent.Opazili smo, da so razmerja med omenjenimi vrstami radikalov pri UV obsevanem ligninu drugačna kot pri obsevani celulozi. V nadaljevanju nas je zanimalo, kako na fotodegradacijo lesa vplivajo zaščitni pripravki na osnovi bakra. Ugotovili smo, da se razmerja med posameznimi vrstami radikalov pri z bakrovimi pripravki zaščitenem lesu, statistično značilno ločijo od rezultatov pri nezaščitenem lesu.
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