magistrska naloga
Abstract
Cilj raziskave je bil ugotoviti ali lahko z različnimi kemičnimi in mehanskimi postopki pripravimo TEMPO modificirano nanocelulozo in jo uporabimo za pripravo novega, okolju prijaznejšega polimera, ki bi služil kot alternativa trenutno bolj uveljavljenim sintetičnim polimerom. Celulozna vlakna smo najprej kemično modificirali z uporabo (2,2,6,6-tetrametilpiperidin-1-) oksidanil (TEMPO) radikala in modificiran produkt mehansko obdelali do TEMPO oksidirane nanoceluloze. Le-to smo uporabili kot surovino za izdelavo estra s poliolom Desmophen 1262. Kemijske in fizikalne spremembe v materialih smo spremljali skozi celotnen postopek in jih med seboj primerjali. Ugotovili smo, da je s postopki kemične in mehanske obdelave možno pripraviti nanocelulozne fibrile z visoko vsebnostjo karboksilnih skupin, ki so primerne za izdelavo estra. Končni produkt, ester, smo analizirali s termičnimi metodami in IR spektrometrijo. Ugotovili smo, da se termične lastnosti sicer ne razlikujejo bistveno od celuloze in TEMPO modificirane celuloze, vendar IR spektroskopija kaže, da imamo v končnem produktu estrsko vez, ki je dokaz, da nam je uspelo cepiti poliol Desmophen 1262 na TEMPO oksidirano nanocelulozo. Dobljeni ester bi lahko uporabili kot nadomestek za uveljavljene sintetične polimerne materiale
Keywords
celuloza;nanoceluloza;TEMPO oksidacija;cepljen polimer;celulozni ester;
Data
Language: |
Slovenian |
Year of publishing: |
2015 |
Typology: |
2.09 - Master's Thesis |
Organization: |
UL BF - Biotechnical Faculty |
Publisher: |
[J. Levanič] |
UDC: |
630*813 |
COBISS: |
2436489
|
Views: |
33 |
Downloads: |
9 |
Average score: |
0 (0 votes) |
Metadata: |
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Other data
Secondary language: |
English |
Secondary title: |
Functionalisation of nanofibrilated cellulose with the Tempo reagent |
Secondary abstract: |
The goal of this research was to determine if we can use chemical and mechanical procedures to produce TEMPO oxidized nanocellulose and use it in the manufacture of a new, enviormentaly friendly polymer which would replace the already well established synthetic polymers. Cellulose fibres were chemically modified with the use of the (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO) radical and the modified product was mechanically disintegrated to TEMPO oxidized nanocellulose. This was used as a precursor in the manufacture of an ester, together with Desmophen 1262. The chemical and mechanical changes in the materials were monitored during the whole process and comapred to their unmodified counterparts. We have determined that through chemical and mechanical processing we can produce nanocellulose fibres with a high content of carboxylic groups, which are suitable for manufacture of an ester. Ester as the final product was analysed by thermal analysis and IR spectroscopy. Thermal properties do not differ significantly from those of cellulose and TEMPO oxidized nanocellulose but IR spectroscopy shows a change in the chemical structure that could mean an ester functional group. This means a successul graft of the polyol Desmophen 1262 to the TEMPO oxidized nanocellulose. The resulting ester could potentially replace well established synthetic polymers |
Secondary keywords: |
cellulose;nanocellulose;TEMPO oxidation;grafted polymer;cellulose ester; |
Type (COBISS): |
Master's thesis/paper |
Thesis comment: |
Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo |
Pages: |
XI, 71 str. |
ID: |
24398908 |