Table 3.
Calculated effective diffusivity values for carvacrol from various films at 60 °C. Determined by fitting the mathematical model for short times diffusion-limited desorption from a polymer film surface to the release profile of carvacrol from the films measured by TGA (the number in parenthesis indicate the standard deviation obtained from at least three independent experiments).
| Polymer Film | No of Layers | Carvacrol Effective Diffusivity ×1014, m2 s−1 |
|---|---|---|
| (LDPE/carvacrol)/EVOH | 9 | 1.11 a (0.19) |
| (LDPE/carvacrol)/EVOH | 17 | 1.57 b (0.23) |
| (LDPE/carvacrol)/EVOH | 33 | 2.22 c (0.37) |
| (LDPE/carvacrol)/EVOH | 65 | 1.35 a,b (0.22) |
| (LDPE/[HNTs/carvacrol])/EVOH | 9 | 2.45 e (0.08) |
| (LDPE/[HNTs/carvacrol])/EVOH | 17 | 2.39 e,d (0.33) |
| (LDPE/[HNTs/carvacrol])/EVOH | 33 | 2.54 e,d (0.39) |
| (LDPE/[HNTs/carvacrol])/EVOH | 65 | 2.76 d (0.02) |
| LDPE/carvacrol | 1 | 418 f (72) |
| LDPE/(HNTs/carvacrol) | 1 | 285 g (24) |
a,b,c,d,e,f,g—note that values with different superscripts are statistically different.