Abstract
AbstractCarboxy‐terminated liquid‐crystalline poly(ethylene terephthalate‐co‐oxybenzoate)s with 60 and 75 mol‐% oxybenzoate units were modified with phenyl‐1,4‐bis(2‐oxazoline) and phenyl‐1,3,5‐tris(2‐oxazoline) in plasticorder and extruder. The modification gave rise to significant increase in molecular weights and also slight crosslinking and branching. The course of the reaction was followed by means of torque‐vs.‐time curves measured during the plasticorder modification. In spite of strong increase in melt viscosities the processability of the modified copolyesters was not worsened. Samples were injection‐moulded and tested. Modifications improved the mechanical properties, distinctly. Especially, samples which were slightly crosslinked with phenyl‐1,3,5‐tris(2‐oxazoline) demonstrated outstanding tensile and impact strengths. Significant differences in fracture behaviour could be evidenced by recording impact bending tests.
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