Foam bulk density of PP, PP/MS (0.5%), PP/MS (2.0%), and PP/MS (5.0%) foams prepared at 154 °C and 20 MPa.
| Foam sample | PP | PP/MS (0.5%) | PP/MS (2.0%) | PP/MS (5.0%) |
|---|---|---|---|---|
| Cell wall thickness (μm) | 1.61 | 2.40 | 2.73 | 2.81 |
| Bulk density (g cm−3) | 0.10 | 0.16 | 0.18 | 0.22 |
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