Highly oriented block copoly(ether ester) by solid state extrusion

Summary A segmented block copoly(ether ester) based on poly(butylene terephthalate) as “hard” segments and on poly(oxytetramethylene) as “soft” segments was highly oriented by cold flow extrusion. Upon further stretching of the high modulus material, the crystallites are tilted by 34∘ with respect to the stretching direction and a four point small angle X-ray pattern is obtained.