A modified copolyester (MCPET)ano-antimony doped tin dioxide ( ATO) composite was prepared by in-situ polymerization and was spun into fibers and fabrics. Hie structure and properties of the nanocomposite and fiber thereof were characterized. The results showed that nano-ATO subjected to surface treatment can disperse in MCPET matrix uniformly. MCPET/ATO composite had the glass transition temperature almost unchanged as compared with MCPET. The introduction of nano-ATO enhanced the cool and heat crystallization capabilities of MCPET, causing the crystallinity and melting point of the composite to rise and the orientation degree of MCPETano-ATO fiber to increase. The mass specific resistance of MCPETano-ATO fiber and the electrostatic half-life of the fabric thereof appeared a downward and then upward tendency as the content of nano-ATO was increased. The nano-ATO mass fraction of the composite should be controlled as 0.50% -0.75%.%采用原位聚合法制备改性共聚酯(MCPET)/纳米掺锑二氧化锡(ATO)共混物,经纺丝得到其纤维及织物,并对共混物及其纤维的结构与性能进行了表征.结果表明:纳米ATO经表面处理后能够较均匀分散于MCPET基体中；MCPET/ATO共混物相对于MCPET的玻璃化转变温度变化不大,纳米ATO的加入提高了MCPET的冷结晶和热结晶能力,共混物的结晶度和熔点升高,MCPET/纳米ATO纤维的取向度增加；MCPET/纳米ATO纤维的质量比电阻及其织物的静电半衰期随着纳米ATO的增加呈现先下降后上升的趋势,共混物中纳米ATO含量质量分数应控制在0.50％～0.75％.
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