title: Photoresponsive cellulose fibers by surface modification with multifunctional cellulose derivatives.
abstract: Eucalyptus bleached kraft pulp fibers were modified by adsorption of novel bio-based multifunctional cellulose derivatives in order to generate light responsive surfaces. The cellulose derivatives used were decorated with both cationic groups (degree of substitution, DS of 0.34) and photoactive groups (DS of 0.11 and 0.37). The adsorption was studied by UV-vis spectroscopy, surface plasmon resonance (SPR) and time-of-flight secondary ion mass spectroscopy (ToF-SIMS). The adsorption isotherms followed the Freundlich model and it turned out that the main driving force for the adsorption was electrostatic interaction. Moreover, strong indications for hydrophobic interactions between the fibers and the derivatives and the derivatives themselves were found. ToF-SIMS imaging revealed an even distribution of the derivatives on the fiber surfaces. The modified fibers underwent fast photocrosslinking under UV-irradiation as demonstrated by light absorbance and fluorescence measurements. Thus, our results proved that the modified fibers exhibited light-responsive properties and can potentially be used for the manufacture of smart bio-based materials.
authors.affiliation: Laboratory of Fiber and Cellulose Technology, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo, Finland.
authors.forename: Olga
authors.initials: O
authors.lastname: Grigoray
authors.affiliation: Laboratory of Fiber and Cellulose Technology, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo, Finland.
authors.forename: Holger
authors.initials: H
authors.lastname: Wondraczek
authors.affiliation: Laboratory of Fiber and Cellulose Technology, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo, Finland.
authors.forename: Elina
authors.initials: E
authors.lastname: Heikkilä
authors.affiliation: Laboratory of Fiber and Cellulose Technology, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo, Finland; Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, Saudi Arabia. Electronic address: pfardim@abo.fi.
authors.forename: Pedro
authors.initials: P
authors.lastname: Fardim
authors.affiliation: Laboratory of Fiber and Cellulose Technology, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo, Finland; Center of Excellence for Polysaccharide Research, Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, 07743 Jena, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Heinze
mesh_terms: D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D005052:Eucalyptus / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008027:Light; D055672:Static Electricity; D013499:Surface Properties / Q000528:radiation effects
chemical_list: D002482:Cellulose
keywords: Cationic cellulose derivatives; Eucalyptus pulp fibers; Photo-activity; SPR; Surface modification; ToF-SIMS