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Ultrahigh molecular weight polyethylene free volume hole structure studied by positron annihilation lifetime technique
Author(s) -
Misheva Maria,
Djourelov Nikolay,
Dimitrova Antoaneta,
Zamfirova Galina
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20001101)201:17<2348::aid-macp2348>3.0.co;2-n
Subject(s) - crystallinity , positron annihilation , annihilation , positron , polyethylene , scattering , materials science , volume (thermodynamics) , phase (matter) , crystallography , polymer chemistry , chemistry , thermodynamics , nuclear physics , composite material , physics , optics , organic chemistry , electron
The positron annihilation lifetime technique has been used to study the structure of three types of ultrahigh 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 Å and 3.3 Å, 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.