[Retracted] Preparation and Supercritical CO₂ Foaming of Modified Nanocrystalline Cellulose Reinforced Polylactic Acid Bionanocomposites

Figure 10

Cell structure of foaming material under different incubation times (110°C, 16 MPa): (a) foaming time 0.5 h, (b) foaming time 1 h, (c) foaming time 2 h, (d) foaming time 4 h, and (e) foaming time 8 h.