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In the field of crystalline polymers the morphological and structural studies of polymers have remarkably developed since the fold structure of single crystal of polymers was discovered by Keller1 in 1957. This discovery has rendered us a new structural view, which is contributing to the interpretation of physical properties of crystallized polymers. Strict analysis of molecular arrangements within polymer crystal and beautiful electron photomicrographs of lamellar structure as observed in bulk crystallized linear polyethylene seem to admit no question of the state of aggregation of polymer molecules in the crystalline texture. This view is, however, not adequate in the case of polymers such as polyester, polyamide and polypropylene having 40—50 per cent amorphous region in their bulkcrystallized texture. Such polymers are rather more frequently found than highly crystalline polymers such as high density polyethylene and polyoxymethylene. For the polymers with medium degree of crystallinity the structural studies using x-ray diffraction, electron photomicrography and other methods seem to be insufficient to describe the state of aggregation of molecules in the crystalline texture, especially in the amorphous region. Dispersion behaviour of polymers gives information different from the structural studies in some point in grasping the actual state of crystallized polymer. The main purpose of this article is to describe the real state of crystallized polymer by supplementing the information of structural studies with knowledge obtained from dispersion behaviours.

Crystallized state of polymer in its dispersion behaviour