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Prediction of elastic properties of nanofibrillated cellulose from micromechanical modeling and nano-structure characterization by transmission electron microscopy

Prediction of elastic properties of nanofibrillated cellulose from micromechanical modeling and nano-structure characterization by transmission electron microscopy

Kategori
Vitenskapelig artikkel
Sammendrag
Cellulose-based materials have a great potential in terms of mechanical performance, since crystalline cellulose is known to have excellent stiffness along the main axis. This potential is not completely fulfilled in structural wood materials and in composite materials, due to structural inhomogeneities, misalignment, voids etc. on several length scales. This study investigates the difference in stiffness of nanofibrillated cellulose (NFC) compared to that of cellulose crystallites, based on nanostructural characterization, image analysis and micromechanical modeling. Nanofibrillated cellulose is believed to be composed of a distribution of crystallites in an amorphous matrix, and it is assumed to represent the distribution of the crystalline allomorph Iβ. To predict the elastic properties of NFC, a micromechanical model based on a Mori–Tanaka approach and self-consistent scheme was used. The input data, i.e. orientation distribution, aspect ratio and volume fraction of these crystalline regions, were estimated from image analysis of transmission electron micrographs. The model predicts a ca. 56 % loss of stiffness of NFC compared to that of cellulose crystals along the main axis.
Språk
Engelsk
Forfatter(e)
  • Gabriella Josefsson
  • Bjørn Steinar Tanem
  • Yanjun Li
  • Per Erik Vullum
  • E. Kristofer Gamstedt
Institusjon(er)
  • Uppsala universitet
  • SINTEF Industri / Materialer og nanoteknologi
  • SINTEF Industri / Metallproduksjon og prosessering
År
Publisert i
Cellulose
ISSN
0969-0239
Forlag
Springer
Årgang
20
Hefte nr.
2
Side(r)
761 - 770