Copolyesteramides—VI. Hexamethylene adipamide/hexamethylene adipate random and ordered copolymers: molecular aspects

✍ Scribed by I. Goodman; R.J. Sheahan

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 515 KB
• Volume: 26
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(90)90008-r

✦ Synopsis

Crystallinity in polyesteramides composed of the units NH(CH2)6NH.OC(CH2)4CO (A) and O(CH2)~O.OC(CH:)4CO (B) has been examined by X-ray diffraction and i.r. spectroscopy. Despite some discrepancy with results from thermal analysis, it is confirmed that copolymers containing ~> 30 wt% of (A) units show only nylon 6,6 type crystallinity, whereas at high (B) contents dual (polyamide + polyester) crystallinity may occur but crystallization of the (B) component is impaired, i.r. Spectroscopy has also established the occurrence of amide-ester hydrogen bonding in (A)/(B) copolymers and in the related polymer [NH(CH:)60.OC(CH2)4CO], ,. The carbonyl group signals in the 13C-NMR spectra accord with the chain structures expected from the method of polymerization.