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Chemical modification of regenerated cellulose fibres by cellulose nano-crystals: Towards hierarchical structure for structural composites reinforcement
Luleå University of Technology, Luleå, Sweden ; Cadi Ayyad University, Marrakech, Morocco.
Cadi Ayyad University, Marrakech, Morocco.
RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP. Luleå University of Technology, Luleå, Sweden.
2017 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 100, 41-50 p.Article in journal (Refereed) Published
Abstract [en]

A simple and innovative new route, with less negative impact on the environment, for depositing and hope-grafting cellulose nano-crystals onto the surface of regenerated cellulose fibres (Cordenka 700 Super 3), using γ-methacryloxypropyltrimethoxysilane as coupling agent, is presented. Hierarchical cellulosic structure involving micro-scale fibres and nano-scale cellulose crystal network was created as verified by the scanning electron microscopy. The fibres were initially oxidised by optimized concentration of cerium ammonium nitrate to generate radicals on the cellulose backbone in order to polymerize the coupling agent at the surface. Infrared spectroscopy and scanning electron microscopy confirmed the chemical polymerisation of MPS onto regenerated cellulose fibres without enabling to show the chemical bonding between silane and nano-crystals. However, tensile test which was performed to study the impact of different treatments on mechanical properties of regenerated cellulose fibres, revealed that the modification by silane decreased the stiffness and strength of fibres (22% and 10% decrease, respectively) while the strain at failure was increased. These changes were attributed to the treatment conditions which may have induced the disorder and the misalignment of the structure of cellulose fibres (e.g. axial orientation of molecular chains and crystalline phase of the fibre has been reduced). This assumption is supported by the results from successive loading-unloading test of the fibre bundle. However, after depositing cellulose nano-crystals onto the fibre’s surface, the stiffness was recovered (20% increase in comparison to MPS treated fibres) while the strength and strain at failure remained at the same order of magnitude as for fibres treated only by the coupling agent.

Place, publisher, year, edition, pages
Elsevier B.V. , 2017. Vol. 100, 41-50 p.
Keyword [en]
Cellulose; Cellulose derivatives; Cerium; Chemical bonds; Chemical modification; Coupling agents; Crystal structure; Electron microscopy; Fibers; Infrared spectroscopy; Mechanical properties; Molecular orientation; Nanotechnology; Scanning electron microscopy; Stiffness; Strain; Tensile testing; Textile fibers; Unloading, Cellulose nano-crystals; Cerium ammonium nitrates; Different treatments; Hierarchical structures; Impact on the environment; Loading-unloading tests; Regenerated cellulose; Structural composites, Tensile strength
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-30039DOI: 10.1016/j.indcrop.2017.02.006Scopus ID: 2-s2.0-85012964625OAI: oai:DiVA.org:ri-30039DiVA: diva2:1119589
Available from: 2017-07-04 Created: 2017-07-04 Last updated: 2017-07-04Bibliographically approved

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