20.500.12556/RUL-642 Razbarvanje utekočinjenega lesa z vodikovim peroksidom diplomsko delo - visokošolski strokovni študij Discolouration of liquefied wood with hydrogen peroxide graduation thesis - higher professional studies S termokemično reakcijo z glicerolom in s katalizatorjem žveplovo(VI) kislino smo utekočinili topolov les. Določili smo izkoristek utekočinjenja, nato pa izvedli poskuse razbarvanja utekočinjenih zmesi z vodno raztopino vodikovega peroksida. Preučili smo tudi morebitni vpliv vrednosti pH na razbarvanje utekočinjenega lesa. Produkte reakcije utekočinjenega lesa z raztopinami vodikovega peroksida smo nanesli na steklene ploščice in filme utrdili pri temperaturi 130 °C. V nadaljevanju smo izmerili naslednje lastnosti utrjenih filmov: stopnja utrditve, debelina filma, odpornost proti tekočinam, prožnost po Petersu, trdota po Königu in barva. Ugotovili smo, da je bilo razbarvanje utekočinjenih zmesi z vodnimi raztopinami vodikovega peroksida minimalno. Opazili smo tudi, da so bili premazi iz utekočinjenega lesa higroskopni. We liquefied poplar wood with a thermo chemical reaction with glycerol and the catalyst of sulphuric(VI) acid. We determined the liquefaction yield and then we performed some experiments of discolouration of the liquefied mixtures with the water solution of hydrogen peroxide. We also studied the potential influence of pH value on discoloration of liquefied wood. We applied the products of liquefied wood with solutions of hydrogen peroxide on glass plates and cured the films at 130 °C. We measured the following properties of the cured films: drying stage, thickness of the film, resistance to liquids, flexibility by Peters, hardness by König and colour. We stated that the discolouration of the liquefied mixtures with water solutions of hydrogen peroxide was minimal. We also noted that coatings made of liquefied wood were hygroscopic. utekočinjen les razbarvanje vodikov peroksid površinski premaz liquefied wood discolouration hydrogen peroxide surface coating true false false [M. Centa] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:26:29 2014-07-11 12:26:29 2022-07-11 10:37:46 0000-00-00 00:00:00 2012 0 Ljubljana 0 VIII, 68 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*829:630*813 1996425 vs_centa_matjaz.pdf vs_centa_matjaz.pdf 1 3455B537D2B71A5251CF5ED59046A77F 17690c795b4fe7c1d2ca6503f91de843ee946eceed37a112d6d09e7d92b95f9d 6662f5ba-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/2cb17d54-a78d-4989-aa99-ae001222890c https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132447 Biotehniška fakulteta 0 0 0