106514 KB0 KB0 KB2021Dahle, SebastianPetrič, MarkoŽigon, JureXIV f., 243 str., 31 str. pril., 30 cmCOBISSID:82005251PID:https://repozitorij.uni-lj.si/IzpisGradiva.php?id=133180URN:URN:NBN:SI:doc-2TG2WGBWenJ. Žigonvisokošolska delacoatingsdielectric barrier dischargedielektrična barierna razelektritevlesobdelava površinomočljivostplasmaplazmapremazisurfacestreatmentwettabilitywoodSurface treatment of wood with floating electrode dielectric barrier discharge plasma| doctoral dissertation| doktorska disertacija| Površinska obdelava lesa z dielektrično barierno razelektritveno plazmo s plavajočo elektrodo|The surfaces of solid materials can be treated by various techniques and processes. In this dissertation, a novel type of device for generating a non-thermal dielectric barrier discharge plasma in a floating electrode configuration was developed and successfully applied to the continuous surface treatment process of solid wood and other lignocellulosic materials. The experimental work included the study of the influence of various parameters of the plasma treatment process on the properties of the treated surfaces and their interactions with applied water-based coating and adhesives. The properties of the generated plasma discharges were dependent on the inherent properties of the substrates and the set device parameters. Treatment of the fresh and aged or weathered substrates with plasma resulted in oxidation of the surfaces, leading to increased surface free energy, improved hydrophilicity and wettability of the wood surface with coating and adhesives. The improved interactions with water-based coating and adhesives were observed on plasma-treated natural wood, thermally modified wood, medium density fiberboard, particleboard, and metals. Pretreatment of wood with plasma had no effect on coating penetration depth in wood. This type of pretreatment technique has proven to be a good alternative to conventional surface treatment processesPovršine trdnih materialov so lahko obdelane z različnimi tehnikami in procesi. V disertaciji je bil razvit nov tip naprave za ustvarjanje ne-termične dielektrične barierne razelektritvene plazme s plavajočo elektrodo in uspešno uporabljen za neprekinjeno obdelavo površin masivnega lesa in ostalih lignoceluloznih materialov. Eksperimentalno delo je vključevalo študije vplivov različnih parametrov procesa obdelave s plazmo na lastnosti obdelanih površin in njihovih interakcij z nanesenim premazom na vodni osnovi in lepili. Lastnosti ustvarjenih plazemskih razelektritev so bile odvisne od inherentnih lastnosti substratov in nastavljenih parametrov naprave. Obdelava svežih in staranih substratov je povzročila oksidacijo njihovih površin, povečanje proste površinske energije, povečano hidrofilnost in omočljivost površin lesa s premazom in lepili. Izboljšane interakcije s premazom in lepili na vodni osnovi so bile zaznane na naravnem lesu, termično modificiranem lesu, vlakneni plošči, iverni plošči in kovinah. Predobdelava s plazmo ni imela vpliva na globino penetracije premaza v les. Ta vrsta tehnike predobdelave se je izkazala kot dobra alternativa običajnim procesom površinske obdelaveTEXTvisokošolska delatheses and dissertationsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Biotehniška fakulteta