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On the crystal structure of odd–even nylons: Polymorphism of nylon 5,10

✍ Scribed by P. Villaseñor; L. Franco; J. A. Subirana; J. Puiggalí

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 589 KB
Volume: 37
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19990901)37:17<2383::aid-polb9>3.0.co;2-g

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✦ Synopsis

The structure of nylon 5,10 has been investigated using electron microscopy and X-ray diffraction. Nylon 5,10 shows polymorphism with two different structures related to the ␥ form obtained by either solution or melt crystallization. Packing differences may be attributed to a change in the hydrogen bonding system. In addition, a structure related to an ␣-like phase can be found by precipitation from strong acid solutions and their mixtures with chloroform. A model with two hydrogen bonding directions is given for this form, in a similar way to that recently postulated for polyamides derived from odd diamine or odd diacid units. Temperature-induced structural changes have also been studied for nylon 5,10 fibers.

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Crystal packing of the studied compounds pSUp (a) and pSEp (b) drawn with the CERIUS 3.1 software package [17] . Unit cells and hydrogen bonds are indicated with dashed lines.