COPOLYESTERAMIDES .5. HEXAMETHYLENE ADIPAMIDE HEXAMETHYLENE ADIPATE RANDOM AND ORDERED COPOLYMERS - PREPARATION AND GENERAL-PROPERTIES

Random, ordered and block polyesteramides of the isosteric units NH(CH2)6NH·OC(CH2)4CO(A) and O(CH2)6O·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. © 1990.