UHMWPE/nano-SiO2 composite fibers were prepared by the method of adding nano-SiO2 in extracting stage

and the influence of nano-SiO2 on the stmcture and properties of UHMWPE fibers were determined by SEM

sonic orientation

WAXD

DSC

TMA and mechanical measurements．The results showed that nano-SiO2 particles diffused into UHMWPE gel fibers during the extracting stage

and they could be dispersed in hallo-size in UHMWPE fibers Compared to virgin UHMWPE fibers

the orientation and erystallinity of UHMWPE/nano-SiO2 composite fibers remained unchanged

while the crystal size decreased greatly．After incorporating nano-SiO2

UHMWPE fibers became both stiffer and tougher than the virgin ones

especially the fiber modulus

which was increased greatly from 1359.24 cN/dtex to 1505.90 cN/dtex Meanwhile．nano-composite UHMWPE fibers displayed a better thermal and thermomechanieal stability.