The Influence of Hydrogen Bonding on the Deformation Micromechanics of Cellulose Fibers

Kong, Kenny; Eichhorn, S. J.

doi:10.1080/00222340500324597

Cited by 30 publications

(30 citation statements)

References 33 publications

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“…It is therefore possible that the crystalline domains are not as restricted from movement (rotation) under compressive strain and therefore not as prone to buckling as highly crystalline high modulus fibres. Apparently, the same mechanism of reorientation of misaligned domains upon straining as proposed by Northolt and Baltussen (2002) and confirmed for low-orientation lyocell fibres by Kong and Eichhorn (2005b) is valid for both tension and compression in the studied regenerated cellulose fibre. However, it is uncertain whether this observation may be generalized to all kinds of regenerated cellulose fibres.…”

Section: Resultssupporting

confidence: 54%

“…According to Northolt and Baltussen (2002), misaligned domains align with the direction of applied tensile load, and this reorientation entails a linear increase of the elastic modulus of the fibre. Reorientation of misaligned domains was confirmed by Kong and Eichhorn (2005b) for fibres with low orientation. However, for high orientation fibres it was suggested that chain deformation dominates the micromechanical behaviour, and that such fibres behave in a way predicted by a linear series aggregate model (Kong and Eichhorn 2005b).…”

Section: Introductionsupporting

confidence: 52%

“…Reorientation of misaligned domains was confirmed by Kong and Eichhorn (2005b) for fibres with low orientation. However, for high orientation fibres it was suggested that chain deformation dominates the micromechanical behaviour, and that such fibres behave in a way predicted by a linear series aggregate model (Kong and Eichhorn 2005b). Northolt and Baltussen (2002) also predict that the tensile and compressive yield stress are the same in regenerated cellulose fibres, since the same mechanism of domain reorientation due to between-domain shear deformation is valid in both load cases.…”

Section: Introductionsupporting

confidence: 52%

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Orientation of cellulose crystallites in regenerated cellulose fibres under tensile and bending loads

et al. 2006

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The degree of orientation in regenerated cellulose fibres with a diameter of 36lm was determined using position-resolved synchrotron X-ray microbeam diffraction. The fibres were characterized in unstrained condition, under tensile strain, and in bending. A homogeneous distribution of the degree of crystalline orientation (Herman's orientation factor f c = 0.85) across the fibre thickness was found in the unstrained fibre. The degree of orientation of cellulose crystallites increased in a linear manner with increasing tensile strain applied to the fibre. Also in bending, a linear relationship between applied strain and the degree of crystalline orientation was found, where f c increased in tension and decreased in compression. This linear relationship was found to be valid for both the tensile and the compressive zone of the bent fibre.

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Section: Resultssupporting

confidence: 54%

Section: Introductionsupporting

confidence: 52%

Section: Introductionsupporting

confidence: 52%

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Orientation of cellulose crystallites in regenerated cellulose fibres under tensile and bending loads

et al. 2006

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“…The crystal structure of cellulose II has been studied by for example X-ray diffraction (Ishikawa and Okano 1997) also combined with FTIR-spectroscopy (Fengel et al 1995), and molecular dynamics simulations (Kroon-Batenburg et al 1996). Raman spectroscopy has recently gained rather widespread use in studying crystallinity and the effect of mercerization on crystallinity and structure of cellulose Schenzel et al 2005;Kong and Eichhorn 2005;Jähn et al 2002), partly due to relatively fast and simple sample preparation. In mercerization studies of fibres from various sources Raman spectroscopy has been combined with for example X-ray diffraction (Zhu et al 2004;Schenzel and Fischer 2001) and environmental scanning electron microscopy (ESEM) (Jähn et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy

Eronen¹,

Österberg²,

Jääskeläinen³

2008

Cellulose

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The aim of this work was to investigate the morphological and structural changes associated with mercerization of cellulose fibres with combined confocal Raman and atomic force microscopy (AFM). During mercerization the alkali induces a change in polymorphic lattice from cellulose I to II. This was observed by confocal Raman spectroscopy from cellulose samples treated with 10, 15 and 25% aqueous sodium hydroxide solution. AFM images from the same samples illustrated that microfibrils were swollen and more granular in cellulose II than in cellulose I. Raman spectral images in plane and depth directions showed that the polymorphous cellulose structure was uniform throughout the cell wall, whereas the microfibril orientation varied between fibre cell wall layers. The changes in microfibril orientation on the sample surfaces were confirmed by AFM images measured from the same sample position.

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“…corresponded to the cellulose C-O ring stretching 32,33 with an alternative assignment for the glycosidic linkage (C-O-C) mode. 34,35 The peak located around 894.9 cm À1 was assigned to mixed modes (C-C-C, C-H-O) including angle bending.…”

mentioning

confidence: 99%

Homogeneous grafting of cellulose with polycaprolactone using quaternary ammonium salt systems and its application for ultraviolet-shielding composite films

Gao

Jiang

et al. 2018

RSC Adv.

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Microcrystalline cellulose grafted polycaprolactone (MCC-g-PCL) was successfully synthesized by ringopening copolymerization catalyzed by 4-dimethylaminopyridine in a dual tetrabutylammonium acetate/ dimethyl sulfoxide solvent system. A novel ultraviolet-shielding film based on MCC-g-PCL was prepared by introducing graphene oxide (GO). The results obtained showed that the introduction of GO not only obviously influenced the inherent structure of the MCC-g-PCL but remarkably changed the surface morphology of the composite film. Moreover, the GO/MCC-g-PCL composite showed a significant improvement in tensile strength, from 2.63 to 4.55 MPa, as well as elongation-at-break, from 6.4% to 15.5%, compared with the pure MCC-g-PCL film, owing to the strong hydrogen-bonding interaction that physically crosslinked GO with MCC-g-PCL. Importantly, GO/MCC-g-PCL composite films offered an effective high-energy light-shielding capacity; in particular MCC-g-PCL film containing 1.0 wt% GO possessed good absorbance between 200 nm and 300 nm. This study provides a framework for developing cellulose-based ultraviolet-shielding polymers and better understanding the ultravioletshielding mechanism.

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The Influence of Hydrogen Bonding on the Deformation Micromechanics of Cellulose Fibers

Cited by 30 publications

References 33 publications

Orientation of cellulose crystallites in regenerated cellulose fibres under tensile and bending loads

Orientation of cellulose crystallites in regenerated cellulose fibres under tensile and bending loads

Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy

Homogeneous grafting of cellulose with polycaprolactone using quaternary ammonium salt systems and its application for ultraviolet-shielding composite films

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