processability,Morphology and Mechanical Properties of Glass Fiber Reinforced Poly(Ether Sulfone) Modified by a Liquid Crystalline Copolyester.

摘要

Ternary composites based on glass fiber reinforced polyethersulfone(gPES) modified by a liquid crystalline copolyester (R5) were obtained by injectionmolding at different nozzle temperatures and at LCP contents up to 20%.The blends showed two pure amorphous phases.The ability of R5 to improve processing was seen mainly in the increase in teh MFI of the blends on 5% LCP addition,which was mor ethan 75% and 16% with respect to that of pure gPES and PES,respectively.The best processing temperature appeared to be 330deg C,as it led to the maximum skin fibrillation and provided both the best small strain and fracture mechanical properties.Theblend processed at330degc with 5% showed the best balance of properties bacause,besides the highestrelative processability increase,it led to maximum values in all mechanicla properties measured.this was due to both the overall fibrillation of the skin and to its having the highest ductility.