Journal
RSC ADVANCES
Volume 5, Issue 20, Pages 15140-15146Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra15445b
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Funding
- Thule Institute
- Future Biorefinery Programme of Finnish Bioeconomy Cluster, FIBIC Ltd.
- Academy of Finland [268144]
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Cellulose nanocrystals (CNCs), which are strong, rod-like constituents of plant cellulose, are promising materials for green packaging applications as the material is capable of forming tortuous network structures with efficient barriers against outside gases. Here, a two-step procedure based on periodate oxidation followed by reductive amination was used as a pretreatment to modify bleached birch chemical wood pulp. Individualized CNCs were obtained from three different butylamino-functionalized pulps by mechanical homogenization. The fabricated CNCs were utilized to form transparent barrier films with a vacuum filtration method. All the butylamino-functionalized CNC films showed capability to resist oxygen permeability even at high relative humidity (RH 80%), and values as low as 5.9 +/- 0.2 cm(3) mm per m(2) per day per kPa were recorded for pure cellulose based film using tert-butylamino-functionalized CNCs. In addition a barriers against water vapor permeation and dynamic vapor sorption were determined up to relative humidities of 80 and 90%, respectively. For surface characterization of the films time-dependent contact angles and surface roughness were measured. The films had good mechanical characteristics with tensile strength of 105.7 +/- 9.7 MPa, strain-to-failure of 6.4 +/- 0.6% and a Young's modulus of 5.8 +/- 0.8 GPa.
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