magistrsko delo
Matic Sitar (Author), Primož Oven (Reviewer), Ida Poljanšek (Mentor)

Abstract

V tem magistrskem delu smo z diferenčno dinamično kalorimetrijo spremljali utrjevanje melamin-urea-formaldehidne (MUF) smole z dodatkom treh različnih vrst nanoceluloze: z nanofibrilirano celulozo (NFC), TEMPO oksidirano NFC (TNFC) in z lignoceluloznimi nanofibrilami (LCNF). Kot katalizator smo uporabili 40 % raztopino amonijevega sulfata. Vzorce smo zamreževali v 100 in 40 (mikro)l aluminijastih lončkih pri različnih hitrostih segrevanja. V nekaterih primerih smo dodali tudi različne koncentracije nanoceluloze. Ugotovili smo, da MUF smola bolje zamrežuje z nanofibrilirano celulozo (NFC) kot s TEMPO oksidirano NFC (TNFC). Ne glede na količino in vrsto dodane nanceluloze, smo pri MUF smoli s katalizatorjem beležili praktično identične temperature in čase začetka zamreževanj ter doseženih temperatur eksotermnega vrha (Tmaks). Lignocelulozne nanofibrile (LCNF) pa z izbranim katalizatorjem niso kazale eksotermnih signalov, zato jih nadalje z MUF smolo nismo zamreževali. Z infrardečo spektroskopijo FT-IR ni bilo mogoče ugotoviti razlik v intenziteti trakov med vzorci MUF, MUF/NFC in MUF/TNFC, saj so bili FT-IR spektri med seboj zelo podobni. Predpostavljamo, da je bila koncentracija metilen-etrskih in metilenskih mostičkov med MUF in NFC/TNFC za identifikacijo s to metodo prenizka.

Keywords

MUF smola;nanoceluloza;kinetika;DSC;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [M. Sitar]
UDC: 630*813
COBISS: 29370627 Link will open in a new window
Views: 339
Downloads: 75
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Curing kinetics of the melamine-urea-formaldehyde resin with the addition of nanofibrillated cellulose
Secondary abstract: In this master thesis, the differential scanning calorimetry was used to investigate curing of the melamine-urea-formaldehyde (MUF) resin with the addition of three different types of nanocellulose: nanofibrillated cellulose (NFC), TEMPO-oxidized NFC (TNFC) and lignocellulose nanofibrils (LCNF). A 40% concentration of ammonium sulfate was used as catalyst. The samples were crosslinked in 100 and 40 (micro)l aluminum pans at different heating rates. In addition, several different types and concentrations of nanocelluloses were added. We found that the MUF resin crosslinked to a greater extent with NFC than with TNFC. Regardless of the additive and the type of nanocellulose added, almost identical onset temperatures and times as well as the peak temperature (Tmax) reached were recorded with the MUF resin with catalyst. Lignocellulose nanofibrils (LCNF), however, did not show any exothermic signals with the selected catalyst, so that they were no longer used for crosslinking with the MUF resin. The cured samples were also tested by FT-IR infrared spectroscopy. We did not notice any differences in the FT-IR spectra between the MUF, MUF/NFC and MUF/TNFC samples. The concentration of methylene-ether and methylene bridges between MUF and NFC/TNFC seems to be too low for identification with this method.
Secondary keywords: MUF resin;nanocellulose;kinetics;DSC;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: IX, 47 f., [8] f. pril.
ID: 12042882