Abstract
The positron annihilation lifetime technique has been used to study the structure of three types of ultra-high molecular weight polyethylene, obtained via different supported catalyst systems and hence having different molecular weights and degree of crystallinity. Pores with two different mean radii, about 1.8 A and 3.3 A, were observed in the studied samples. A comparison between positron annihilation and wide angle X-ray scattering and microhardness measurements has been made. There are evidences that crystalline phase contributes to o-Ps formation. The existence of a shorter long-lived component τ 3 is explained by the latter fact.
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