The properties and features of nano-scale futile TiO2 and bulk phase rutile TiO2 were gained by some methods．suchas TEM

UV-Vis

IR and so on．Polypropylene／POE

polypmpylene／nano—TiO2／POE composites and polypropylene／bulk—TiO2／POE composites were prepared by a melt—blending process．Polypropylene and composites were degradated in a 28 days accelerated aging test with a laboratory xenon arc lamp(GB／T 16422．2-1999)．It was shown that

with the UV shielding capability of nano-scale futile TiO2

the ageing resistance of polypropylene was improved．the survice life of polypropylene was prolonged and the tougheness of PP was increased to a great extent too．The ageing resistance of polypropylene／nano—TiO2／POE composites was better than that of polypmpylene／bulk—TiO2／POE composites．After 28 days exposure to xenon arc lamp the IZOD unnotched impact strength of polypropylene／(1.0 wt％)nano．TiO2／POE composites was 80．45 kJ·m-2which was more than four times as high as that of pure PP．At the sanme time the impact strength of polypropylene／(1．0 wt％)bulk—TiO2／POE composites was only 47．88 kJ·m-2 after 28 days exposure to xenon arc lamp．