Synthesis and effect of polyphosphazenes on the thermal, mechanical and morphological properties of poly(etherimide)/thermotropic liquid crystalline polymer blend

Effect of functionalized polyphosphazene as compatibilizer in melt-compounded polyetherimide (PEI)/liquid crystalline polymer (LCP) blend has been investigated in details. DMTA study showed the variation in glass transition temperature (Tg) in presence of polyphosphazene having different funtionalization. Superior thermal stability of polyphosphazene aided composites is exhibited from thermo-gravimetric analysis. From dielectric measurements it was clear that polyphosphazene-aided PEI/LCP blend can act as low dielectric material as well as high dielectric material depending on the nature of pendant group used. Scanning electronic microscopic observation revealed that the addition of small amount of polyphosphazene results in a decrease in average disperse domain sizes of LCP phase leading to improved filler-matrix adhesion.