This research focused on the influence of microfillers on mechanical properties and molecular orientation of injection molded reinforced thermotropic random copolyester based on 1,4-hydroxybenzoic acid (B) and 2,6-hydroxynaphthoic acid (N) 73:23 mol%. The strain at failure of the neat LCP occurred within 3% deformation. The addition of microfillers initially decreased the Young modulus and the strain at failure. However, the combination of graphite/glass fibers did increase the Young modulus, and increased the yield stress. Addition of microfillers significantly randomized the molecular orientation; the lowest molecular orientation was obtained for the graphite/glass fibers composite, hence the highest Young's modulus. Analysis of fractured samples suggests that the main mechanism for fracture is loss of adhesion between the microfillers and polymer matrix, this effect being more evident when using glass fiber.

Role of microfillers on molecular orientation and mechanical properties of thermotropic copolyester

242nd National Meeting (2011)

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