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This article reveals that the already known improved properties of the thermoplastic polymer(TP) - liquid crystalline polymer(LCP) blends can be further improved substantially over the corresponding noncompatibilizationcounterparts by using a reaction in-situ compatibilizer, a commercially anailable tetra-functional epoxy and isocyanate. The effect of the compatibilization was investigated by morphology, rheology and mechanical properties. Morphologyof compatibilized in-situ composites was found the fiber in the skin become finer and the domain on the core was small than noncompatibilizer. Thisimprovement is ascribed to better adhesion between the PAR matrix with the LCPfiber and better dispersion of the LCP fiber. It required only a very small amount of the epoxy and isocyanate monomers, a few fractions of one precent,to improve drastically the mechanical properties of the PAR/LCP blends. Theshear viscosity was increase when added epoxy and isocyanate monomers and demonstrate the molecular weight was increased.
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