Spherulites from polyamides with a structure characterized by three hydrogen‐bond directions |
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Authors: | L. Franco,J. Puiggalí |
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Abstract: | Polyamides constituted by glycine residues have a peculiar structure characterized by the establishment of intermolecular hydrogen bonds along three different directions. Spherulites of polyglycine and nylons 2/3, 2/3/3, 2/6, and 2/11 have been obtained from evaporation of concentrated solutions or from the molten state. In all cases, a negative birefringence was detected. This fact differs from the observations on spherulites of conventional nylons where intermolecular hydrogen bonds are formed along a single direction and sheet structures are postulated. Polarizing light, scanning electron, and transmission electron microscopy showed that banded spherulites are usually formed in the crystallization of nylons 2/n. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 1719–1726, 2002 |
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Keywords: | spherulites polyamides nylons TEM |
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