Ordered repeated structures (crystals) encountered in polymers below a certain temperature Most polymers are semi-crystalline containing both crystalline and amorphous regions (see also GLASS TRANSITION and MELTING POINT)
for polymers, the state wherein a periodic and repeating atomic arrangement is achieved by molecular chain alignment
A state of molecular structure in some resins attributed to the existence of solid crystals with a definite geometric form, Such structures are characterized by uniformity and compactness
a molecular structure resulting from the formation of solid crystals with a definite geometric pattern
The presence of three-dimensional order on the level of atomic dimensions In polymers, the range of order may be as small as about 2 nm in one (or more) crystallographic direction(s) and is usually below 50 nm in at least one direction Polymer crystals frequently do not display the perfection that is usual for low-molecular mass substances Polymer crystals that can be manipulated individually are often called polymer single crystals Pure and Appl chem, 1989, 61, 769 IUPAC Macromolecular Nomenclature