Amorphous domain, definition

The crystalline and noncrystalline phases in polyamide fibers do not appear to be governed by what may be defined as thermodynamie equilibria, nor is there evidenee for definite boundaries between a phase, characterized by a simple or complex state of order and an essentially amorphous phase. It is therefore quite obvious that the morphological structure of nylons cannot be described adequately in terms of a simple two-phase model according to which ideally ordered crystallites exist together with eompletely amorphous domains. This model constitutes merely one of the two limiting cases the other is that of a paracrystal according to which all deviations from the ideal crystal are ascribed to defects and distortions of the crystal lattice [275-277]. 

Due to their higher dimensions, the macromolecules may successively penetrate several crystalline domains, thus interconnecting them. The spaces between these crystalline regions do not have a ordered structure, any longer, appearing as amorphous regions. In practice, there are no polymers with 100% crystallinity degree. The correct and common definition of these polymer types is semicrystalline polymers . 

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