Miscibility behaviour of poly(ether ether ketone)/poly(ether ketone) blends - thermal and morphological studies

In the present investigation the blends comprising of poly(ether ether keto ne) and poly(ether ketone) have been prepared by melt extrusion. Miscibilit y behaviour of the blends was studied by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). A single glass transition tem perature (T-g) varying linearly with composition was obtained. Also a singl e melting endotherm was observed for all compositions, which shows that the blends are isomorphic in nature. Crystalline melting point (T-m) of the bl ends is essentially same as those of higher melting constituent until high levels of low melting constituent are present. SEM results show that there is homogeneous dispersion of the blend components and a single phase behavi our was observed. Flexural strength and modulus shows almost additive behav iour except at some compositions where synergistic behaviour was seen. (C) 2001 Elsevier Science Ltd. All rights reserved.