Copolyesteramides—V. Hexamethylene adipamide/hexamethylene adipate random and ordered copolymers: Preparation and general properties

✍ Scribed by I. Goodman; R.J. Sheahan

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 684 KB
• Volume: 26
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(90)90007-q

✦ Synopsis

Random, ordered and block polyesteramides of the isosteric units NH(CH2)6NH'OC(CH2)4CO (A) and O(CH2)60.OC(CH2)4CO (B) have been prepared. The thermal and mechanical properties depend upon both the proportion and distribution of A units in the molecular chain. For A group contents above ca 30 wt%, the materials behave essentially as modified nylon 6,6 polymers but, at higher B group contents, dual crystallinity occurs in some cases and the crystallinity of the polyB component is significantly impaired. The polyesteramide of unit structure O(CH2)6NH'OC(CH2)4CO, functionally isomeric with 1 : 1 copolymers of A with B, is crystalline despite the random (head-head, head-tail) structure expected.