Modification of nanofibrillated cellulose using amphiphilic block-structured galactoglucomannans

Lozhechnikova, Alina; Dax, Daniel; Vartiainen, Jari; Willför, Stefan; Xu, Chunlin; Österberg, Monika

doi:10.1016/j.carbpol.2014.03.087

Cited by 33 publications

(27 citation statements)

References 40 publications

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“…This was expected for WSPS modified nanopapers, in which WSPS act as plasticizer between stiff CNF, enhancing the ductility of the nanopaper in accordance with previous results (Lucenius et al 2014;Olszewska et al 2013b). During film formation from aqueous suspensions, the WSPS form a water-swollen dissipative layer on the CNF surface (Lozhechnikova et al 2014;Eronen et al 2011), thus enhancing the dispersibility of CNF. This is crucial to avoid CNF aggregation and defects in the final nanopaper resulting in improved mechanical properties.…”

Section: Resultssupporting

confidence: 85%

Multi-layer nanopaper based composites

et al. 2017

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Native cellulose nanofibrils (CNF) were prepared from bleached birch pulp without any chemical or enzymatic pretreatment. These CNF were modified by adsorption of a small amount of watersoluble polysaccharides and used to prepare nanopapers, which were processed into composites by lamination with an epoxy resin and subsequently cured. The results were compared to the properties of composites prepared using bacterial cellulose nanopapers, since bacterial cellulose constitutes highly pure and crystalline cellulose. It was found that both types of nanopapers significantly improved both the thermal stability and mechanical properties of the epoxy resin. As anticipated, addition of only 2 wt% of watersoluble polysaccharides efficiently hindered crackpropagation within the nanopaper and significantly improved the tensile strength and work of fracture compared to composites containing a conventional nanopaper reinforcement. The mechanical properties of the composites thus reflected the improvement of the nanopaper properties by the polysaccharides. Moreover, it was possible to predict the properties of the final composite from the mechanical performance of the nanopapers.

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Section: Resultssupporting

confidence: 85%

Multi-layer nanopaper based composites

et al. 2017

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“…attachment of amphiphilic moieties onto the NFC films does at the best change the surface properties of parts of the outermost NFC-layer (Lozhechnikova et al 2014). Today, crosslinking of the nanofibrils seems as the most viable route for producing effective barriers at high humidity conditions.…”

Section: Barrier Studies On Nfc Filmsmentioning

confidence: 99%

Nanofibrillated cellulose: properties reinvestigated

Naderi

2017

Cellulose

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The scientific publications on nanofibrillated cellulose (NFC) were reviewed in the light of recent developments in the field of characterization of NFC, and the evolving understanding of the material. This led to several insights, which challenged few of the established assumptions with regard to e.g. rheological properties of NFC suspensions, and factors affecting tensile strength and barrier properties of NFC films. The realizations may promote the wider application of nanofibrillated celluloses.

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“…In one other case, however, fatty acids and short polydimethylsiloxanes were added to the reducing end of galactoglucomannan using reductive amination, which was found to increase its adsorption to cellulose by lowering water solubility while retaining affinity to the cellulose surface. 52 Distinct from the adlayers formed by the xylan copolymers generated herein, specific modification of the reducing end of galactoglucomannan promoted bilayer formation. 52 These differences highlight options to regulate both the chemical functionality and organization of hemicellulose coatings.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…52 Distinct from the adlayers formed by the xylan copolymers generated herein, specific modification of the reducing end of galactoglucomannan promoted bilayer formation. 52 These differences highlight options to regulate both the chemical functionality and organization of hemicellulose coatings.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Enzymatically Debranched Xylans in Graft Copolymerization

Littunen¹,

Mai-Gisondi²,

Seppälä³

et al. 2017

Biomacromolecules

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Wheat arabinoxylan was treated with two α-arabinofuranosidases exhibiting different mode of action to create three different polymeric substrates. These three substrate preparations were characterized by xylopyranose backbone sugars that are (1) singly substituted by arabinose at C2 or C3, (2) doubly substituted by arabinose at C2 and C3, and (3) largely unsubstituted. All xylan preparations were grafted with glycidyl methacrylate using cerium ammonium nitrate and then evaluated in terms of graft yield and adsorption to cellulose surfaces. The highest graft yield was observed for the xylan preparation characterized by a largely unsubstituted xylopyranose backbone. Furthermore, QCM-D analyses revealed that grafted xylans exhibited a two-stage desorption pattern, which was not seen with the ungrafted xylans and was consistent with increased water sorption. Accordingly, this study demonstrates the potential of arabinofuranosidases to increase the yield and influence the viscoelastic properties of grafted xylans used as biobased cellulose coatings.

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Modification of nanofibrillated cellulose using amphiphilic block-structured galactoglucomannans

Cited by 33 publications

References 40 publications

Multi-layer nanopaper based composites

Multi-layer nanopaper based composites

Nanofibrillated cellulose: properties reinvestigated

Enzymatically Debranched Xylans in Graft Copolymerization

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