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| - Crystals and Crystallinity inPolymeric Materials
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| Abstract
| - A new view of the concepts of crystallinity and crystals in syntheticmacromolecules is discussed. In polymeric materials, crystallinitymay be present with the concomitant occurrence of large amountsof structural disorder and in the absence of true three-dimensionallong-range order. The structures of semicrystalline polymericmaterials are discussed in terms of idealized limit models ofcrystals, where long-range order may be achieved for structuralfeatures that are not necessarily coincident with single atoms andare not necessarily point-centered. Typical examples of non-point-centered structural features are the straight lines correspondingto the chain axes of polymer molecules. This view explains theunusual ability of polymers to crystallize even in the presence of ahigh degree of structural disorder.
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