Abstract
Nanofibrillated cellulose, NFC, is an interesting wood fibre-based
material that could be utilized in coatings, foams, composites,
packages, dispersions, and emulsions, due to its high tensile strength
and barrier properties, light weight, and stabilizing features. To
improve applicability and properties of NFC, modification of its surface
properties is often needed. In this study, the applicability of
laccase-aided surface modification with hydrophobic dodecyl gallate
(DOGA) on unbleached NFC was investigated. Also, laccase-catalyzed
polymerization of DOGA and other phenolic compounds with lignin
moieties was investigated by matrix-assisted laser
desorption/ionization time-of-flight mass spectroscopy (MALDI-TOF MS).
NFC modified with T. hirsuta-based laccase and DOGA showed
decreased hydrophilicity, as compared with the native NFC, when coated
on a paper surface. When dried as free-standing films, the surface
properties of chemo-enzymatically modified NFC resembled those of the
native NFC. The effect of modification was thus greatly influenced by
different surface formation in differently prepared samples. Also,
changing of the dispersion properties of DOGA by enzymatic
polymerization affected the surface properties of the dried NFC
samples. Covalent bonding between DOGA and NFC was not the main factor
affecting the surface properties of the NFC in free-standing films or
coatings.
Original language | English |
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Pages (from-to) | 5749-5770 |
Number of pages | 22 |
Journal | BioResources |
Volume | 7 |
Issue number | 4 |
Publication status | Published - 2012 |
MoE publication type | A1 Journal article-refereed |
Keywords
- nanocellulose
- laccase
- grafting
- dodecyl gallate
- contact angle
- matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy
- MALDI-TOF MS