Parent lamellae

Figure 18 Schematic model of a iPP and y iPP branching from a parent lamellae. The crystallographic axes are indicated. Adapted from similar schemes in Refs. [245,246], with permission of Elsevier copyright 2004.

The appearance and disappearance of some of the induced nuclei suggest that they are formed at the surface as a result of a trapped polymer chain in the parent lamellae. In addition when a polymer crystallizes very quickly, stresses... 

Fig. 16 AFM phase images of a BA-C8 film obtained at room temperature, a The presence of an induced nucleus near a parent lamella and b the disappearance of the induced nucleus [82]...

Fig. 17 AFM phase image obtained on a BA-C12 film. Three induced nuclei are observed at about 15 nm away from the parent lamella [83]...

Figure 3.18 shows a schematic representation of double-oriented-kebab strac-ture. Stacks of parent lamellae is responsible for meridional scattering the SAXS patterns, whereas stacks of daughter lamellae exhibited equatorial scattering. The equatorial scattering is attributed to the overlap of scattering from daughter lamellae and shish. 

Figure 3.51 Illustration of induced nucleation of a crystal from either cilia or loose folds in the parent lamella. From Chan and Li [72b] with kind permission from Springer...

One form of spherulite nucleation is illustrated in Figure 3.61. The single lamella in the first image (a) contains an induced nucleus that appears as a barely visible dot slightly below the midpoint. From this grow two lamellae in panel (b). As these new lamellae are on the same side of the parent lamella, they do not correspond to a screw dislocation. Additional induced nuclei... 

As described briefly in the introduction to this section, spherulite growth requires approximately radially directed fibrillar or ribbon-like crystals and the creation of more crystals at larger distances from the center. Any new crystals spawned from existing ones must splay from the parent lamella or from one another in order to fill the gaps between diverging dominant lamellae. Keith and Padden in 1963 attributed what they... 

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