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Production of regenerated nanocomposite fibers based on cellulose and their use in all-cellulose composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics. (Wood and Bionanocomposites)
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Biobased all-cellulose composites (ACCs), in which the matrix and the reinforcement are made out of the same material, have gained a noticeable increased attention in recent years. Their successful application would solve the commonly faced challenges with natural fiber composites regarding their chemical antipathy between the hydrophilic fiber and the usually hydrophobic polymer matrix, while still keeping the advantages of being environmental friendly. Moreover, the use of man-made continuous regenerated cellulose fibers for this purpose could result in unidirectional all-cellulose composites with excellent mechanical properties. In this study, a new processing technique for unidirectional all-cellulose composites, reinforced with continuous regenerated cellulose nanocomposite fibers, has been developed, where the fibers are wound directly after the coagulation bath and then welded together while still being swelled in order to form all-cellulose composite sheets without the need of adding any additional solvent or chemicals. Scanning electron microscopy and tensile testing were used to investigate and compare the microstructure and mechanical properties, of a reference material without nanoreinforced fibers and two variants reinforced with 2 % cellulose nanocrystals (CNCs) and 2 % halloysite nanotubes (HNTs). Analysis revealed that transparent all-cellulose composites with a high compaction degree and minimal warpage during shrinkage, showing high mechanical properties could be made. However, the addition of nanoreinforcements did not lead to any improvements. 

Place, publisher, year, edition, pages
2017.
Keywords [en]
All-cellulose composites, regenerated cellulose nanocomposite fibers, halloysite nanotubes, cellulose nanocrystals, LiCl/DMAc, bio based
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-65897OAI: oai:DiVA.org:ltu-65897DiVA, id: diva2:1145948
Educational program
Materials Engineering, master's level (120 credits)
Supervisors
Examiners
Available from: 2017-10-04 Created: 2017-10-01 Last updated: 2017-12-14Bibliographically approved

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CiteExportLink to record
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