Abstract: Modified copolyester(MCPET)/ nanoparticle composites were prepared by in-situ polymerization, and the corresponding fibers were acquired by melt spinning. The structure and properties of fibers were characterized. It was found that nanoparticles are well dispersed in the MCPET matrix, and the size of the nanoparticles are about 100～500nm. Compared with the MCPET, the crystallization rate and crystallinity of the MCPET/nanocomposites increase due to the nucleating effect of nanoparticles. The introduction of the nanoparticles enhanced the orientation degree and the strength of the fibers. The specific resistance of the fibers prepared by the MCPET/ nanoparticles composites (with 1 wt% of nanoparticles) is about 2.1×108 ??g/cm2, which is much lower than that of the neat PET fibers (about 3.8×1013??g/cm2), and the hybrid fibers show a better anti-static property.

Key words: in-situ polymerization, modified co-polyester, inorganic conductive nonapaticle, anti-static