X-ray structural investigation on a series of polyesteramides

✍ Scribed by M. Cesari; G. Perego; A. Melis

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 453 KB
• Volume: 12
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(76)90019-7

✦ Synopsis

The crystal structures of three polyesteramides of the type --/CO--~--CO--NH--(CH 2 ),--NH--CO--qS--CO--O~(CH 2),,,--O/., conventionally referred to as nNTm, i.e. 6NT6, 12NT6 and 12NT12, were investigated by X-ray diffraction methods. The copolymers crystallize with triclinic symmetry and the repeat distances along the chain axis are 31.78(8), 39.27(20) and 46.77(15)A, respectively. In 6NT6, the crystal structure of which was studied in more detail, the conformation of the molecular chain displays some departure from the fully extended form, particularly by rotation of the amide and the ester groups (about 26 and 15, respectively) away from the plane of the benzene ring. Layers of chains, linked together by intermolecular hydrogen bonds, are formed. For the other two copolymers, evidence was obtained for a rather close isomorphism. A model of a structural disorder is proposed and discussed for the 6NT6 copolymer.

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