fig8

Figure 8. Polarized optical micrographs of PCL spherulites in PCL/PVB blends showing (A) nucleation of PCL on the silica particles and (B) PCL spherulites. (C) Upward (left) and downward (right) displacement of the extinction bands of PCL spherulites (the vertical and round arrows indicating the rotation axis and direction, respectively). (D) Fractions of left- and right-handed twists without silica (top), with D-SiO₂ (middle) and L-SiO₂ (bottom). This figure is used with permission from the American Chemical Society^[49]. PCL: Poly(ε-caprolactone); PVB: poly(vinylbutyral).