title: Modification of nanofibrillated cellulose using amphiphilic block-structured galactoglucomannans.
abstract: Nanofibrillated cellulose (NFC) and hemicelluloses have shown to be highly promising renewable components both as barrier materials and in novel biocomposites. However, the hydrophilic nature of these materials restricts their use in some applications. In this work, the usability of modified O-acetyl galactoglucomannan (GGM) for modification of NFC surface properties was studied. Four GGM-block-structured, amphiphilic derivatives were synthesized using either fatty acids or polydimethylsiloxane as hydrophobic tails. The adsorption of these GGM derivatives was consecutively examined in aqueous solution using a quartz crystal microbalance with dissipation monitoring (QCM-D). It was found that the hydrophobic tails did not hinder adsorption of the GGM derivatives to cellulose, which was concluded to be due to the presence of the native GGM-block with high affinity to cellulose. The layer properties of the adsorbed block-co-polymers were discussed and evaluated. Self-standing NFC films were further prepared and coated with the GGM derivatives and the effect of the surface modification on wetting properties and oxygen permeability (OP) of the modified films was assessed.
authors.affiliation: Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, FI-0076 Aalto, Finland.
authors.forename: Alina
authors.initials: A
authors.lastname: Lozhechnikova
authors.affiliation: Process Chemistry Centre, c/o Laboratory of Wood and Paper Chemistry, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo/Turku, Finland. Electronic address: ddax@abo.fi.
authors.forename: Daniel
authors.initials: D
authors.lastname: Dax
authors.affiliation: VTT Technical Research Centre of Finland, Biologinkuja 7, P.O. Box 1000, FI-02044 Espoo, Finland.
authors.forename: Jari
authors.initials: J
authors.lastname: Vartiainen
authors.affiliation: Process Chemistry Centre, c/o Laboratory of Wood and Paper Chemistry, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo/Turku, Finland.
authors.forename: Stefan
authors.initials: S
authors.lastname: Willför
authors.affiliation: Process Chemistry Centre, c/o Laboratory of Wood and Paper Chemistry, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo/Turku, Finland; Wallenberg Wood Science Center, KTH, The Royal Institute of Technology, SE-10044 Stockholm, Sweden.
authors.forename: Chunlin
authors.initials: C
authors.lastname: Xu
authors.affiliation: Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16300, FI-0076 Aalto, Finland. Electronic address: monika.osterberg@aalto.fi.
authors.forename: Monika
authors.initials: M
authors.lastname: Österberg
mesh_terms: D002482:Cellulose / Q000737:chemistry* / Q000378:metabolism; D057927:Hydrophobic and Hydrophilic Interactions; D008351:Mannans / Q000737:chemistry* / Q000378:metabolism; D057139:Nanofibers / Q000737:chemistry*
chemical_list: D008351:Mannans; C443804:galactoglucomannan; D002482:Cellulose
keywords: Amphiphilic; CNF; Fatty acid; NFC; O-Acetyl galactoglucomannan; QCM-D