Miscible binary blends of poly(ethylene oxide) and an amorphous aromatic polyamide (Aramide 34I): crystallization, melting behavior and semi-crystalline morphology

The crystallizable component poly(ethylene oxide) (PEO) displays liquid-liq uid phase separation in blends with the rigid amorphous aromatic polyamide, Aramide 34I. The crystallization, melting behavior and the semi-crystallin e morphology after crystallization from the miscible state, are investigate d. It is found that the amorphous component, Aramide 34I, has a pronounced effect on the crystallization behavior of PEO; PEO can only be crystallized up to 35 wt.% of Aramide 34I. A complex melting behavior of PEO with secon dary crystallization and recrystallization, in which the amorphous componen t segregates interlamellarly during crystallization, is described. A lamell ar insertion model is proposed for the location of the secondary lamellae. (C) 1999 Elsevier Science Ltd. All rights reserved.