Fig. 15.

a Schematic representation of the preparation of amorphous and crystalline PLLA embedded with TPE-EP and the polymer phase determination. Fluorescence photos of b amorphous and c crystalline polymer films and (insets) their corresponding magnified images. Inset scale bar: 1 cm. d Overview fluorescence micrograph of the outer surface of the PLLA film with a mixture of crystalline and amorphous regions. e Confocal fluorescence 3D images of crystalline spherulites. f Fluorescence images of TPE-EP-embedded PLLA at various degrees of crystallinity. Scale bar: 5 mm. g Representative microscopic fluorescence (2D) and h confocal (3D) representation of the PLLA spherulites with alternative bright and dark yellow spirals in the anticlockwise direction. i Enantiomeric CPL switch upon film inversion.

Reproduced from [99] with permission from the Royal Society of Chemistry