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Poli(vinil alkoholni) filmi z dodatkom nanofibrilirane celuloze in ekstrakta lesa bora : diplomsko delo = Polyvinil alcohol films with added nanofibrilated cellulose and extract from pine wood : B. Sc. thesisKeržič, EliCilj diplomske naloge je bila priprava filmov na osnovi polimera in dveh biokomponent. Polimer polivinil alkohol (PVA) naj bi služil kot osnovna matrica nanofibrilirana celuloza (NFC) kot ojačitev ... ter ekstrakt iz lesa bora, za izboljšanje odpornosti proti mikroorganizmom. Najprej smo pripravili vse tri komponente ločeno. Kot prvo smo izvedli ekstrakcijo po Soxhletu. Uporabili smo topili cikloheksan in etanol. Ekstrakte smo analizirali z gravimetrično metodo, UV-Vis spektrofotometrijo in s tekočinsko kromatografijo visoke ločljivosti (HPLC). Ekstrakti so vsebovali največ pinosilvin monometilnega etra ter nekoliko manj pinosilvina in nortrahelogenina. Cikloheksanski ekstrakti so vsebovali manj ekstraktivov kot etanolni. Analizi ekstraktov je sledilo koncentriranje ekstraktov z rotavapiranjem, liofilizacijavodne suspenzije NFC in priprava 10 % vodne raztopine PVA. Komponente kompozita smo v ustreznih razmerjih zmešali z magnetnim mešalom. Mešanico smo vlili v steklene petrijevke. Filmi so se 2 dni sušili na prostem, nato pa 3 tedne v sušilniku na 50 °C. Osušeni filmi se niso ločili od podlage, zato smo za mehanski test izbrali razenje površine. Dodatek NFC in z reagentom TEMPO modificirane NFC (T_NFC) je ohranil ali izboljšal mehanske lastnosti polimera PVA. Sami ekstraktivi so imeli negativen vpliv na trdoto filma, v kombinaciji z NFC pa pozitivnega. Rezultati raziskave so pokazali, da je najprimernejša sestava kompozita 98 % PVA, 1 % NFC ter 1 % ekstraktivov.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [E. Keržič], 2017Language - slovenianCOBISS.SI-ID - 2811529
Author
Keržič, Eli
Other authors
Oven, Primož |
Vek, Viljem |
Poljanšek, Ida
Topics
polivinil alkohol |
nanofibrilirana celuloza |
ekstraktivi |
filmi |
UV-Vis |
HPLC |
polyvinil alcohol |
nanofibrillated cellulose |
extractives |
films |
UV-ViS |
HPLC
Library/institution |
City | Acronym | For loan | Other holdings |
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BF, Department of Wood Science and Technology, Lj. | Ljubljana | BFLES |
reading room 1 cop.
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Year | Impact factor | Edition | Category | Classification | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
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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Keržič, Eli | 53624 |
Oven, Primož | 11223 |
Vek, Viljem | 30758 |
Poljanšek, Ida | 12041 |
Source: Personal bibliographies
and: SICRIS
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