20.500.12556/RUL-124049 Obdelava površin lesa z DBD plazmo za izboljšanje kompatibilnosti z vodnimi premazi Surface treatment of wood with DBD plasma for enhancement of compatibility with waterborne coatings Sposobnost sorpcije vode v les je pomembna za kakovostno in enakomerno tehnološko obdelavo in zaščito lesa z vodnimi premazi. Za doseganje želenih lastnosti površine lesa obstajajo različne možnosti obdelave. Ena od teh je obdelava s plazmo, ki lahko odvisno od danih pogojev poveča ali zmanjša zmožnost sorpcije vode. V magistrskem delu smo učinkovitost obdelave površin lesa s plazmo ocenili z merjenjem stičnega kota vodne kapljice, določitvijo proste površinske energije s plazmo obdelanih površin, z opazovanjem sprememb površine s konfokalnim laserskim mikroskopom, z ugotavljanjem oprijemnosti premaza ter z ugotavljanjem kemičnih sprememb z infrardečo spektroskopijo. Meritve smo izvajali na vzorcih, ki smo jih kondicionirali pri različnih vlažnostih (φ= 33 %; 65 %; 88 %), po različnih časih obdelave s plazmo (takoj po obdelavi ter eno uro in 24 ur po njej), na vzorcih različne debeline (d = 1,85 mm; 2,59 mm; 3,28 mm) ter učinke obdelave s plazmo primerjali na smrekovini in bukovini kakor tudi na termično modificiranem smrekovem in bukovem lesu. Ugotovili smo, da obdelava s plazmo poveča omakanje površine lesa z vodo, pri meritvi stičnega kota kapljice premaza na vodni osnovi pa je prišlo do nasprotnega učinka. Obdelava lesa s plazmo povzroči dvig njegove proste površinske energije, ter tudi zmanjšanje hrapavosti obdelanih površin. The ability to absorb water into wood is important for quality and uniform technological treatment and the protection of wood with waterborne coatings. To achieve the desired properties of the wood surface, there are different processing options. One of these is plasma treatment, which can increase or decrease the water sorption capacity depending on the given conditions. In this master’s thesis, the efficiency of plasma treatment was assessed by measuring the water contact angle, determination of surface free energy, observation of surface changes with a confocal laser microscope, determination of adhesion of the coating, and by detection of chemical changes with infrared spectroscopy. The measurements were performed on samples that were conditioned at different humidities (φ = 33 %; 65 %; 88 %), at different times after plasma treatment (immediately after the treatment and after one and 24 hours), on the samples of different thicknesses (d = 1.85 mm; 2.59 mm; 3.28 mm), and the effects of plasma treatment were compared on spruce and beech wood, and also on thermally modified spruce and beech wood. It was found that plasma treatment increases wetting of wood with water, while in the case of the waterborne coatings the opposite effect occurred. Plasma treatment increases surface free energy of wood, and also decreases the wood’s surface roughness. plazma prosta površinska energija vodni premaz stični kot oprijemna trdnost premaza plasma surface free energy waterborne coating contact angle adhesion strength true false false [Ž. Verbič] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2020-12-23 07:15:11 2020-12-23 07:15:21 2025-08-11 15:08:21 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*829.2 187573 43674115 11579.pdf 11579.pdf 1 400A808C3F1EF3472E33D054AE2999B4 172519c922da762c86bd1a679b19f135c978968841c210e8850e71e3cd77d782 7640267d-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=139431 Biotehniška fakulteta 0 0 0