Qualitative theory for the picture frame morphology of annealed lamellar crystals

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Abstract
A number of more-or-less distinctive crystalline morphologies have been shown to result from the annealing of polymer single crystals [1]. Among these morphological types are “picture frames,” “amoebas,” and “swiss cheese.” Generally, the lateral shape changes described by these terms accompany an increase in thickness. However, there is lacking in the literature an effort to correlate mechanistically the lateral shape change with the thickening process. In this paper an attempt is made to demonstrate how the picture frame morphology develops as the end state of a sequence of steps resulting in crystal thickening.