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Sambandet mellan cellulosakedjans polymerisationsgrad och styrkan i nanofibrillerad cellulosafilm
KTH, School of Chemical Science and Engineering (CHE).
2015 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
The Relationship between the Degree of Polymerization of Cellulose Chains and the Strength of Nanofibrillated Cellulose Film (English)
Abstract [sv]

Studiens syfte var att undersöka vilken effekt cellulosakedjornas polymerisationsgrad (D.P.) har på styrkan i nanofibrillerad cellulosafilm (NFC-film). Detta är av intresse på grund av tidigare studier som indikerar att både filmstyrkan och töjningen hos NFC-film ökar med ett ökande D.P. hos materialet som NFC produceras ifrån, samt att starkare NFC-filmer önskas tas fram. En ökad styrka och töjning hos NFC-filmer är viktigt för att kunna utöka användningsområdet för filmen, t.ex. inom applikationer som beständiga displayers eller till förpackningar.

I denna studie framställdes NFC system genom att först hydrolysera ett bomullsmaterial med högt D.P. till olika grader. Bomullen karboxymetylerades därefter för att sedan homogeniseras till NFC. Avslutningsvis, framställdes filmer baserade på de olika NFC systemen, vars mekaniska egenskaper undersöktes för att utvärdera effekten av D.P. Dragtesten som utfördes på filmerna visade på att dragindexet (TSI) var det som påverkades mest markant av D.P. variationen. Det tycktes finnas en kritisk gräns för D.P. ≤ 2600, under vilken styrkan sjunker medan en icke nämnvärd förändring av styrkan sker över gränsen.

Abstract [en]

The purpose of this study was to investigate the effect of the degree of polymerization (D.P.) of cellulose on the strength of nanofibrillated cellulose film (NFC-film). The interest to investigate this effect is based on earlier studies, which have shown results that indicate on an increasing strength and strain for the films with an increasing D.P. of the material from which the NFC is produced. The desire to produce stronger NFC-films is also a reason for the study. Both an increased strength and strain are desired in the NFC-films, because it would expand the possible use of the films, for example as displays and in packaging applications.

In this study, the NFC systems were prepared by first hydrolyzing the cotton linters, which had a high D.P., to different degrees. Then the cotton systems were carboxymetylated and homogenized. Finally, the films were prepared from the different NFC systems, whose mechanical properties were studied to evaluate the effect of D.P. The tensile tests that were performed on the films showed that the tensile strength index (TSI) was most significantly affected by the D.P. variation. There seemed to be a critical limit for D.P. at ≤ 2600, below which the strength decreases while a non-significant change in strength occurred above.

Place, publisher, year, edition, pages
2015.
Keyword [sv]
Cellulosa, bomull, nanofibrillerad cellulosa, NFC, karboxymetylering, homogenisering, polymerisationsgrad, D.P., hydrolys, NFC-film
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-179642OAI: oai:DiVA.org:kth-179642DiVA: diva2:885112
Educational program
Bachelor of Science in Engineering - Chemical Engineering
Available from: 2015-12-18 Created: 2015-12-18 Last updated: 2015-12-18Bibliographically approved

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