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Vpliv izbranih okoljskih dejavnikov na dinamiko vlaženja lesa : doktorska disertacija = Influence of selected environmental factors on moisture dynamics of wood : doctoral dissertationŽlahtič Zupanc, MojcaV doktorski nalogi smo raziskavo zastavili na 17 različnih materialih. Na lesu smreke, bora, macesna, bukve, kostanja in hrasta. Relevantne lastnosti lesa smo izboljšali s termično modifikacijo, z ... impregnacijo z baker-etanolaminskim pripravkom, s tungovim oljem in z emulzijo naravnega voska. Vzorce smo izpostavili različnim dejavnikom staranja: glivi bele in rjave trohnobe, glivam modrivkam, umetnemu pospešenemu staranju in naravnemu staranju na testnem polju. Ugotovili smo, da se dinamika vlaženja lesa s staranjem spreminja ter je odvisna od lesne vrste in postopka zaščite. Po staranju smo okarakterizirali delovanje dejavnikov staranja in določili dinamiko vlaženja na vzorcih. Določili smo izgubo mase ter barvne in kemijske spremembe. Dinamiko vlaženja smo določali s kapilarnim navzemom vode, z določanjem stičnega kota z metodo s kapljico, dolgotrajnim navzemom vode in s sorpcijskim testom. Ugotovili smo, da se vodoodbojnost in odpornost materiala proti navlaževanju pri večini materialov s staranjem poslabšata. Izjema so materiali, zaščiteni z voski, ki so po nekaterih postopkih staranja izkazali celo bolj hidrofobno površino. Med vsemi testiranimi materiali sta se za najboljša izkazala termično modificirana smrekovina in bukovina, zaščiteni z emulzijo naravnih voskov. Tudi les, impregniran z olji, je dobro ohranil hidrofobnost. Ugotovili smo, da je z laboratorijskimi testi mogoče določiti odpornost lesa proti navlaževanju, če vzorce pred tem staramo. Dinamika vlaženja lesa je kompleksna lastnost, ki je ni mogoče določiti zgolj z enim laboratorijskim testom, ampak je za to pomembna kombinacija testov. V drugem delu smo se posvetili jedrski magnetni resonanci. Metodo slikanja z magnetno resonanco smo uporabili v raziskavah o dinamiki vlaženja, sušenja in navzema zaščitnih sredstev v les. Z dobljenim signalom in 3D-modelom porazdelitve vode v preizkušancu smo nadgradili informacije o vlažnosti, dobljene s klasičnimi metodami. Ugotovili smo, da je magnetna resonanca primerna metoda za tovrstne raziskave.Type of material - dissertation ; adult, seriousPublication and manufacture - Ljubljana : [M. Žlahtič Zupanc], 2017Language - slovenian, englishCOBISS.SI-ID - 2782089
Author
Žlahtič Zupanc, Mojca
Other authors
Humar, Miha |
Serša, Igor
Topics
les |
voda |
vodoodbojnost |
življenjska doba |
zaščita lesa |
MRI |
disertacije |
disertacije |
wood |
water |
water exclusion efficacy |
service life of wood |
wood protection |
MRI |
MRI
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BF, Central Biotechnical Library, Lj. |
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Skladišče DR II 0000009947 IN: 02017057948 Skladišče DR II 9947 IN: 02017057948 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Žlahtič Zupanc, Mojca | 36375 |
Humar, Miha | 19106 |
Serša, Igor | 12056 |
Source: Personal bibliographies
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