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Electron micrographs of nylon 6 and polyoxymethylene crystals drawn on a Mylar substrate at room temperature indicate that the deformation of these crystals occurs through a combination of plastic deformation and the formation of cracks. In nylon 6 cracks are formed preferentially between hydrogen‐bonded planes but can also form so as to result in rupture of the hydrogen bonds. There was no evidence for twinning or a crystal transformation during the deformation of either polymer.
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P. H. Geil (1964) studied this question.
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