Abstract
A brief survey is presented on polymer single crystals including some still unpublished material. After a short historical retrospect the basic facts on single crystals and chain folding, a new structural concept derived therefrom, are outlined. Subsequently problems concerning the structure of folds and the origin of chain folding are discussed, the latter point leading to various theories on chain folding. Structural consequences of chain folding such as sectorization and non-planar habits, which lead to the problem of fold packing, are next surveyed for the simplest monolayer crystals, followed by a brief description of observations on more complex mutilayer crystals and on some new features of crystallization from concentrated solutions. Finally there is a short reference to the possibility of single crystals and chain folding occurring in the melt crystallized bulk, including oriented systems.
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