Abstract
Bio-based films are typically sensitive towards moisture
which limits the industrial applicability. In this study
the cellulosic films produced from cellulose nanofibrils
and cellophane were treated using supercritical state
carbon dioxide impregnation with hydrophobic
polyunsaturated oil mixture (walnut oil). The effects on
surface hydrophobicity with cellophane films were clear
and indisputable. Water contact angles of non-treated
cellophane, walnut oil impregnated and further
1,6-hexanediol dimethacrylate crosslinked films were 62,
82 and 91°, respectively. Also the moisture absorption
and water vapour transmission rate as well as oxygen
transmission rate at 80% relative humidity decreased as a
result of supercritical state carbon dioxide
impregnation. Water vapour transmission rate of walnut
oil impregnated cellulose nanofibrils film decreased by
30% as compared to non-treated film. Based on the FT-IR
analysis and surface roughness measurements the walnut
oil penetrated better into the structure of cellophane as
compared to CNF film. The developed hydrophobization
method can be exploited in strengthening the position of
cellulosic films in high performance film applications.
| Original language | English |
|---|---|
| Pages (from-to) | 541-547 |
| Journal | Nordic Pulp and Paper Research Journal |
| Volume | 31 |
| Issue number | 4 |
| Publication status | Published - 2016 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- cellulose
- film
- barrier
- walnut oil
- cellphane