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Cellulose

, Volume 26, Issue 18, pp 9567–9581 | Cite as

Production of cellulose nanofibrils from alfa fibers and its nanoreinforcement potential in polymer nanocomposites

  • Zineb Kassab
  • Assya Boujemaoui
  • Hicham Ben Youcef
  • Abdelghani Hajlane
  • Hassan Hannache
  • Mounir El AchabyEmail author
Original Research

Abstract

Alfa fibers (Stipa Tenacissima) were effectively utilized in this study as a promising cellulose source for isolation of carboxy-functionalized cellulose nanofibrils (CNFs) using multiple treatments. Pure cellulose microfibers (CMFs) were firstly extracted by alkali and bleaching treatments. CNFs with an average nanofibrils diameter ranging from 1.4 to 4.6 nm and a crystallinity of 89% were isolated from CMFs by a combination of TEMPO-oxidation and mechanical disintegration processes. The morphology and physico-chemical properties of cellulosic materials were evaluated at different stages of treatments using several characterization techniques. Various CNF loadings (5–15 wt%) were incorporated into PVA polymer to evaluate the nanoreinforcement ability of CNFs and to produce CNF-filled PVA nanocomposite materials. The tensile and optical transmittance properties, as well as the morphological and thermal properties of the as-produced CNF-filled PVA nanocomposite films were investigated. It was found that the tensile modulus and strength of nanocomposites were gradually increased with increasing of CNF loadings, with a maximum increase of 90% and 74% was observed for a PVA nanocomposite containing 15 wt% CNFs, respectively. The optical transmittance was reduced from 91% (at 650 nm) for neat PVA polymer to 88%, 82% and 76% for PVA nanocomposites containing 5, 10 and 15 wt% CNFs, respectively. It was also found that the glass transition temperature was gradually increased from 76 °C for neat PVA to 89 °C for PVA nanocomposite containing 15 wt%. This study demonstrates the importance of Alfa fibers as annual renewable lignocellulosic material to produce CNFs with good morphology and excellent properties. These newly developed carboxy-functionalized CNFs could be considered as a potential nanofiller candidate for the preparation of nanocomposite materials of high transparency and good mechanical properties.

Graphic abstract

Keywords

Alfa fibers Cellulose nanofibrils Polymer nanocomposites Mechanical properties 

Notes

Acknowledgments

The financial assistance of the Office Chérifien des Phosphates (OCP S.A.) in the Moroccan Kingdom toward this research is hereby acknowledged. The authors would like to thank the Swedish Foundation for Strategic Research (SSF, Project Number 63634) and the Wallenberg Wood Science Centre (WWSC) for the financial support particularly during Kassab’s stay in KTH. Discussions with Prof L Berglund at KTH are gratefully acknowledged.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Materials Science and Nanoengineering Department (MSN)Mohammed VI Polytechnic University (UM6P)BenguerirMorocco
  2. 2.Laboratoire d’Ingénierie et Matériaux (LIMAT), Faculté des Sciences Ben M’sikUniversité Hassan II de CasablancaCasablancaMorocco
  3. 3.Wallenberg Wood Science Center, Department of Fiber and Polymer TechnologyKTH Royal Institute of TechnologyStockholmSweden

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