Cellulosic nanoparticles from alfa fibers (<Emphasis Type="Italic">Stipa tenacissima)</Emphasis>: extraction procedures and reinforcement potential in polymer nanocomposites |
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| Authors: | Ayman Ben Mabrouk Hamid Kaddami Sami Boufi Fouad Erchiqui Alain Dufresne |
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| Institution: | 1.Laboratoire Sciences des Matériaux et Environnement, LMSE,University of Sfax,Sfax,Tunisia;2.Laboratoire de Chimie Organométallique et Macromoléculaire - Matériaux Composites,Cadi Ayyad University, Faculty of Sciences and Technologies of Marrakesh,Marrakesh,Morocco;3.Laboratoire de Plasturgie et Nanocomposites,Université de Québec en Abitibi-Témiscaminque, Boulevard de l’Université,Rouyn-Noranda,Canada;4.The International School of Paper, Print Media and Biomaterials (Pagora),Grenoble Institut of Technology,Saint Martin d’Hères Cedex,France |
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| Abstract: | The microstructure and chemical composition of alfa (Stipa tenacissima) were investigated. The polysaccharide and lignin contents were around 70 and 20 wt%, respectively. From the bleached and
delignified fibers, two types of nanosized cellulosic particles were extracted, namely cellulose nanocrystals and microfibrillated
cellulose (MFC). The former correspond typically to the elementary crystallite units of the cellulose fibers, with a rod-like
morphology and an aspect ratio of about 20. The latter, mechanically disintegrated from oxidized bleached fibres, presents
an entangled fibrillar structure with widths in the range 5-20 nm. The reinforcing potential of the ensuing nanoparticles
was investigated by casting a mixture of acrylic latex and aqueous dispersion of cellulose nanoparticles. Thermo-mechanical
analysis revealed a huge enhancement of the stiffness above the glass transition of the matrix. Significant differences in
the mechanical reinforcing capability of the nanoparticles were reported. |
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