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

Figure 6

Cell structure of foaming material at different foaming temperatures (2 h, 16 MPa): (a) foaming temperature 90°C, (b) foaming temperature 110°C, (c) foaming temperature 130°C, and (d) foaming temperature 150°C.