Studies On Pet/glass Filled Lcp Blends

Blends of polyethylene terephthalate (PET) and glass-filled thermotropic liquid crystalline polymer (LCP-g) were prepared by a melt mixing technique. The microstructure of the blends, as assessed by XRD, was correlated with the thermal and dynamic properties. At a lower level (up to 20%) of LCP-g, growth is favored. The transition, within the range of 254°–257°C, is the combined effect of melting followed by crystallization, resulting in precipitation of a component in the crystallizing state as observed from DSC analysis. The relaxation phenomena, as observed from DMTA analysis, changed depending on the blend ratio. The structural restrain imposed by the neighboring molecular chain in the crystalline phase shifts the relaxation peak at the higher temperature side. The variation of storage modulus, stiffness, and loss modulus as a function of blend ratio suggested that the phase inversion was at the level of 40 to 50% of LCP-g in the blend. [Under dynamic application at the lower level of LCP-g, the failu...