| Autor: |
Maija Tenkanen, Jouko Niinimäki, Miikka Visanko, Rafal Sliz, Kirsi S. Mikkonen, Juho Antti Sirviö, Osmo E. O. Hormi, Henrikki Liimatainen |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
RSC Advances. 5:15140-15146 |
| ISSN: |
2046-2069 |
| DOI: |
10.1039/c4ra15445b |
| Popis: |
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 cm3 μm per m2 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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