Abstract
Drying oils have been considered as water resistant coatings for bio-based packaging materials; however, their curing rates are slow for industrial applications. Infrared radiation was investigated in this study as a means to increase the curing rate of linseed and tung oils. The effect of oil pretreatment with gamma radiation was also investigated. FTIR spectroscopy was used to monitor chemical changes during oil oxidation. Results indicated that infrared radiation increased the curing rate of linseed and tung oils. The oxidation rate of both oils, as monitored by the decrease of the 3010 cm-1FTIR peak, followed an exponential decay. The structure of cured films was examined by SEM. Images of films cross section were used to develop a qualitative model of the curing process. Linseed and tung oil showed differences in structural development during drying. In the case of linseed oil, the formation of a tough skin layer slowed down oxygen diffusion to the oil underneath, resulting in slow curing. For the case of tung oil, the skin layer shrank as it formed allowing oxygen diffusion and fast curing of tung oil.
| Original language | English |
|---|---|
| Pages (from-to) | 2565-2572 |
| Number of pages | 8 |
| Journal | Journal of Applied Polymer Science |
| Volume | 115 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 5 Mar 2010 |
| Externally published | Yes |
Keywords
- Biobased
- Curing of drying oils
- FTIR monitoring of oil oxidation
- Infrared assisted drying
- Linseed oil
- Oil oxidation
- Structure of drying oil films
- Tung oil
ASJC Scopus subject areas
- General Chemistry
- Surfaces, Coatings and Films
- Polymers and Plastics
- Materials Chemistry