Carboxylic acid and alcohol end groups are thus concentrated in the amorphous region of the solid polymer, and so they can react.

The lamellae are connected by amorphous regions which provide certain elasticity and impact resistance.

Therefore, spherulites have semicrystalline structure where highly ordered lamellae plates are interrupted by amorphous regions.

On the other hand, the amorphous regions between the lamellae within the spherulites give the material certain elasticity and impact resistance.

Those fibers have crystalline and amorphous regions.

Conversely, a lower-intensity heat pulse of longer duration will crystallize an amorphous region.

Below T, amorphous regions alternate with regions which are lamellar crystals.

Light tends to scatter as it crosses the boundaries between crystallites and the amorphous regions between them.

These immobilised amorphous regions are called the rigid amorphous phase.

However when a draw force is imposed, the amorphous regions of the chains are straightened and aligned to the direction of orientation.