Table 4. Summary of the Results with Respect to the Oxygen Transmission Rate of the PLA/OMMT Composites with Different OMMT Loadings.
| OMMT content |
O2 permeability |
|||||
|---|---|---|---|---|---|---|
| Sample | (wt %) | (vol %) | barrera | 10–14 cm3 cm/cm2 s Pa | reduction (%) | test condition |
| neat PLA | 0 | 0 | 0.218 ± 0.015 | 1.635 ± 0.11 | 0 | 23 °C with a relative humidity of 30% according to the ASTM D3985 standard |
| PLA/OMMT-2 | 2 | 1.4 | 0.154 ± 0.01 | 1.155 ± 0.08 | 29.4 | |
| PLA/OMMT-4 | 4 | 2.8 | 0.141 ± 0.007 | 1.058 ± 0.05 | 35.3 | |
| PLA/OMMT-6 | 6 | 4.2 | 0.132 ± 0.01 | 0.990 ± 0.08 | 39.4 | |
| PLA/OMMT-8 | 8 | 5.6 | 0.151 ± 0.02 | 1.133 ± 0.15 | 30.7 | |
| PLA/OMMT-10 | 10 | 7.0 | 0.158 ± 0.03 | 1.185 ± 0.23 | 27.5 | |
| PLA/EGDE1/OMMT-6 | 6 | 4.2 | 0.134 ± 0.012 | 1.005 ± 0.09 | 38.5 | |
| PLA/EGDE2/OMMT-6 | 6 | 4.2 | 0.108 ± 0.01 | 0.810 ± 0.08 | 50.5 | |
| PLA/EGDE4/OMMT-6 | 6 | 4.2 | 0.046 ± 0.005 | 0.345 ± 0.38 | 78.9 | |
| PLA/EGDE6/OMMT-6 | 6 | 4.2 | 0.143 ± 0.01 | 1.073 ± 0.08 | 34.4 | |
| PLA/1.37 vol % GONS30 | 1.145 | 45 | RT, 50% RH | |||
| PLA/0.4 wt % GO31 | 1.2 | 68 | 25 °C | |||
| PLA/0.8 wt % OMMT17 | 0.8 | 0.34 | 29 | 30 °C | ||
| PLA/3 wt % OMMT18 | 3 | 26 | ASTM 1434-82 | |||
| PLA/7 wt % OMMT19 | 7 | 19 | 20 °C and 90% RH | |||
| PLA/8 wt % OMMT20 | 8 | 0.38 | 24 | 20 °C | ||
a
1 barrer = 1 × 10–10 cm3 (STP) cm/cm2 s cm Hg = 7.5 × 10–18 m2/s Pa = 7.5 × 10–14 cm3 (STP) cm/cm2 s Pa; 1 Pa = 7.5005 × 10–4 cm Hg.