1991 Volume 48 Issue 2 Pages 89-95
The effects of thermal modification on the structural properties were studied by dynamic viscoelasticity, infra-red spectroscopy and X-ray diffraction for blends of a liquid crystalline copolyester consisting of p-hydroxybenzoic acid (PHB) and poly (ethylene terephthalate) (PET) and phenoxy resin. Poor miscibility and phase separation between the blend components can be observed for viscoelastic properties of samples moulded at 260°C over the whole composition range studied. The miscibility of the blends is increased by moulding at 280°C, and the blends moulded at 300°C show the same sort of viscoelastic behavior as the homogeneous blends. These changes are accompanied by an interchange reaction between the blend components. The rubbery equilibrium modulus can be observed for the blends moulded at 300°C.
