Mechanical and Optical Properties of Polylactic Acid Films Containing Surfactant-Modified Cellulose Nanocrystals

Figure 5

Polarized light microscopy images of PLA-CNC-DA composites at different CNC loads: (a) 0, (b) 1, (c) 3, (d) 5, and (e) 10% CNC. At different rotating angles 0°, 45°, 90°, and 135°. Images demonstrate the increasing formation of birefringence in the composites. Length of the longest side of each image: 1.5 mm.